UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, ~~D.C.~~DC 20549

FORM 10-K

(Mark One)
ý	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934
x	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2016OR
For the fiscal year ended December 31, 2017OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 033-43007

TERRA NITROGEN COMPANY, L.P.

(Exact name of registrant as specified in its charter)

Delaware		73-1389684
(State or other jurisdiction ofincorporation or organization)		(I.R.S. Employer Identification No.)
4 Parkway North, Suite 400Deerfield, Illinois		60015
(Address of principal executive offices)		(Zip Code)
Registrant's telephone number, including area code (847) 405-2400
Securities registered pursuant to Section 12(b) of the Act:
Securities registered pursuant to section 12(b) of the Act:
Title of each class		Name of each exchange on which registered
Common Units Representing Limited Partner InterestsEvidenced by Depositary Receipts		New York Stock Exchange

Securities registered pursuant to section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer as defined in Rule 405 of the Securities ~~Act. Yes o No ý~~

~~Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the~~ Act. o Yes x o No ý

Indicate by check mark ~~whether~~if the registrant ~~(1) has~~is ~~filed~~not ~~all reports~~ required to befile ~~filed~~reports bypursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files)Act. ~~Yes~~o ýYes x No o

Indicate by check mark ifwhether ~~disclosure~~the ofregistrant ~~delinquent~~(1) has ~~filers~~filed ~~pursuant~~all reports required to ~~Item 405~~be offiled ~~Regulation~~by Section ~~S-K~~13 isor ~~not~~15(d) ~~contained~~of ~~herein,~~the ~~and~~Securities ~~will~~Exchange ~~not~~Act beof ~~contained,~~1934 toduring the ~~best~~preceding of12 months ~~Registrant's~~(or ~~knowledge,~~for insuch ~~definitive~~shorter ~~proxy~~period orthat ~~information~~the ~~statement~~registrant ~~incorporated~~was byrequired ~~reference~~to infile ~~Part III~~such ofreports), ~~this~~and ~~Form~~(2) ~~10-K~~has orbeen ~~any~~subject ~~amendment~~ to ~~this~~such ~~Form~~filing requirements for the past 90 ~~10-K~~days. ýx Yes o No

Indicate by check mark whether the registrant ishas asubmitted ~~large~~electronically ~~accelerated~~and ~~filer,~~posted anon ~~accelerated~~its ~~filer,~~corporate aWeb ~~non-accelerated~~site, ~~filer~~if any, orevery aInteractive ~~smaller~~Data ~~reporting~~File ~~company.~~required ~~See~~to ~~the~~be ~~definitions~~submitted ofand ~~"large~~posted ~~accelerated~~pursuant ~~filer,"~~to ~~"accelerated~~Rule 405 ~~filer"~~of ~~and~~Regulation S-T ~~"smaller~~(§232.405 ~~reporting~~of ~~company"~~this inchapter) ~~Rule~~during the preceding 12 ~~12b-2~~months of(or for such shorter period that the ~~Exchange~~registrant ~~Act.~~was ~~(Check~~required ~~one~~to submit and post such files):. x Yes o No

~~Large~~Indicate ~~accelerated~~by ~~filer~~check omark ~~Accelerated~~if ~~filer~~disclosure ýof ~~Non-accelerated~~delinquent ~~filer~~filers opursuant ~~Smaller~~to ~~reporting~~Item 405 ~~company~~of oRegulation S-K (Do§229.405 of this chapter) is not ~~check~~contained ifherein, aand ~~smaller~~will ~~reporting~~not ~~company)~~be contained, to the best of Registrant's knowledge, in definitive proxy or information statement incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. x

Indicate by check mark whether the registrant is a ~~shell~~large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, ~~(as~~or ~~defined~~an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act~~) Yes o No ý~~.

~~The~~Large ~~aggregate~~accelerated ~~market~~filer ~~value~~o ofAccelerated ~~the~~filer ~~voting~~x ~~and non~~Non-~~voting~~accelerated ~~common~~filer ~~units~~o ~~held~~(Do bynot ~~non-affiliates~~check ~~computed~~if byasmaller ~~reference~~reporting tocompany) ~~the~~Smaller ~~price~~reporting atcompany ~~which~~o ~~the~~Emerging ~~common~~growth ~~units~~company ~~were last sold, or the average bid and asked price of such common units, as of the last business day of the registrant's most recently completed second fiscal quarter was $482,335,608.~~o

~~The~~If ~~number~~an ofemerging ~~common~~growth ~~units~~company, ~~without~~indicate ~~par~~by ~~value,~~check ~~outstanding~~mark asif ofthe ~~February 22,~~registrant ~~2017~~has ~~was~~elected ~~18,501,576~~not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) o Yes x No

The aggregate market value of the voting and non-voting common units held by non-affiliates computed by reference to the price at which the common units were last sold, or the average bid and asked price of such common units, as of the last business day of the registrant's most recently completed second fiscal quarter was $396,034,573.

The number of common units, without par value, outstanding as of February 21, 2018 was 18,501,576.

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TERRA NITROGEN COMPANY, L.P.

Table of Contents

Part I
	Item 1.	Business.	1
	Item 1A.	Risk Factors.	6
	Item 1B.	Unresolved Staff Comments.	21
	Item 2.	Properties.	21
	Item 3.	Legal Proceedings.	21
	Item 4.	Mine Safety Disclosures.	21
Part II
	Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.	22
	Item 6.	Selected Financial Data.	2324
	Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations.	2425
	Item 7A.	Quantitative and Qualitative Disclosures About Market Risk.	3334
	Item 8.	Financial Statements and Supplementary Data.	3435
	Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.	5155
	Item 9A.	Controls and Procedures.	5155
	Item 9B.	Other Information.	5155
Part III
	Item 10.	Directors, Executive Officers and Corporate Governance.	5357
	Item 11.	Executive Compensation.	5963
	Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.	6266
	Item 13.	Certain Relationships and Related Transactions, and Director Independence.	6367
	Item 14.	Principal Accountant Fees and Services.	6468
Part IV
	Item 15.	Exhibits and Financial Statement Schedules.	6569
	Item 16.	Form 10-K Summary.	6569
		Signatures	66
		Exhibit Index	70
		Signatures	72

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TERRA NITROGEN COMPANY, L.P.

Part I

ITEM 1. BUSINESS.

"Notes" referenced throughout this document refer to financial statement note disclosures that are found in Item 8. Financial Statements and Supplementary Data.

Recent Development—Exercise of Call Right

On February 7, 2018, Terra Nitrogen Company, L.P. ("TNCLP," "we," "our" or "us") announced that, in accordance with Section 17.1 of TNCLP’s First Amended and Restated Agreement of Limited Partnership, as amended (the TNCLP Partnership Agreement), Terra Nitrogen GP Inc., a Delaware corporation and the general partner of TNCLP ("TNGP" or the "General Partner"), elected to exercise the right, assigned to TNGP by TNCLP, to purchase all of the issued and outstanding common units representing limited partner interests in TNCLP not already owned by TNGP or its affiliates (the Public Units).

As of April 2, 2018, all rights of the holders of the Public Units will cease, except for the right to receive payment of the purchase price. Upon completion of the purchase on April 2, 2018, TNGP will own 100 percent of the Public Units and will be entitled to all of the benefits resulting from the Public Units. In addition, upon completion of the purchase, the common units representing limited partner interests in TNCLP will cease to be publicly traded or listed on the New York Stock Exchange (NYSE).

Overview

~~Terra Nitrogen Company, L.P. ("~~TNCLP," ~~"we," "our" or "us")~~ is a Delaware limited partnership that produces nitrogen fertilizer products. Our principal products are anhydrous ammonia (ammonia) and urea ammonium nitrate ~~solutions~~solution (UAN), which we manufacture at our facility in Verdigris, Oklahoma.

We conduct our operations through an operating partnership, Terra Nitrogen, Limited Partnership (TNLP or the Operating Partnership, and collectively with TNCLP, the Partnership). We own a 99% limited partner interest in the Operating Partnership, and Terra ~~Nitrogen GP Inc.~~LP Holdings LLC (~~TNGP~~TLPH), oran affiliate of the General Partner), owns a ~~Delaware~~0.975% ~~corporation,~~limited partner interest. TNGP is the general partner of both TNCLP and TNLP and owns a 0.025% general partner interest in each of TNCLP and TNLP. The General Partner is an indirect, wholly owned subsidiary of CF Industries Holdings, Inc. (CF Industries), a Delaware corporation. Ownership of TNCLP is composed of the general partner ~~interests~~interest and the limited partner interests. The general partner interest in TNCLP is represented by 4,720 general partner units. Limited partner interests are represented by common units, which are listed for trading on the ~~New~~NYSE ~~York Stock Exchange~~ under the symbol "TNH", and Class B common units. As of December 31, ~~2016~~2017, we had 18,501,576 common units and 184,072 Class B common units issued and outstanding. CF Industries through its subsidiaries owned 13,889,014 common units (representing approximately 75.1% of the total outstanding common units) and all of the Class B common units as of December 31, ~~2016~~2017. Throughout this document, the term "affiliates of the General Partner" refers to consolidated subsidiaries of CF Industries, including TNGP. CF Industries acquired Terra Industries, Inc. (Terra) in April 2010, and acquired the General Partner and Terra's ownership in the Partnership at that time.

CF Industries, through its subsidiaries, is a global leader in the manufacturing and distribution of nitrogen products, serving both agricultural and industrial customers. CF Industries operates world-class nitrogen manufacturing complexes in the United States, Canada and the United Kingdom and distributes plant nutrients through a system of terminals, warehouses, and associated transportation equipment located primarily in the midwestern United States.

For the year ended December 31, ~~2016~~2017, we sold 2.24 million tons of nitrogen fertilizers, recognized net sales of $~~418~~397.32 million and generated net earnings of $~~209~~153.39 million. Additional financial information about our business is included in Item 7,. Management's Discussion and Analysis of Financial Condition and Results of Operations, and in Item 8,. Financial Statements and Supplementary Data, of this Annual Report on Form 10-K.

TNCLP and TNGP have no employees. ~~Affiliates~~Pursuant ~~of the General Partner provides certain services~~ to ~~us under~~ the Amendment to the General and Administrative Services and Product Offtake Agreement (the Services and Offtake Agreement)., ~~Pursuant~~which tois ~~the~~accounted ~~Services~~for ~~and~~as ~~Offtake~~an ~~Agreement~~operating lease, the Partnership sells all of its nitrogen fertilizer products to affiliates of the General Partner at prices based on market prices for the Partnership's nitrogen fertilizer products. asAlso, ~~defined~~pursuant into the Services and Offtake Agreement, selling prices are determined monthly and are equal to the volume weighted average net invoice price for third party sales (that is, sales by the affiliates of the General Partner to their customers) of product during each month. These selling prices are reduced by any freight or other transportation charges and incentives paid by the affiliates of the General Partner. Title and risk of loss transfer to affiliates of the General Partner as the product is shipped from the plant gate. ~~For~~Affiliates ~~further~~of ~~information regarding our agreements with CF Industries and~~ the General Partner, ~~see~~provide ~~Note 10—Related~~certain ~~Party~~services ~~Transactions.~~to us

We are a master limited partnership (MLP). Partnerships are generally not subject to federal income tax, although publicly traded partnerships (such as TNCLP) are treated as corporations for federal income tax purposes (and therefore are subject to federal income tax), unless at least 90% of the partnership's gross income is "qualifying income" as defined in Section 7704 of the Internal Revenue Code of 1986, as amended, and the partnership is not required to register as an investment company under the Investment Company Act of 1940. As we currently satisfy the requirements to be treated as a partnership for federal income tax purposes, no federal income taxes are paid by the Partnership.

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TERRA NITROGEN COMPANY, L.P.

asunder ~~precedent when determining whether we satisfy~~ the ~~MLP~~Services ~~90%~~and ~~gross~~Offtake ~~income~~Agreement, ~~test.~~including ~~Any~~production ~~change~~planning, inmanufacturing ~~the~~management, ~~federal~~logistics, ~~income~~procurement, ~~tax~~accounting, ~~treatment~~legal, ofrisk ~~income~~management, ~~from~~investor ~~fertilizer-related~~relations ~~activities~~and asother ~~qualifying~~general ~~income~~and ~~could~~administrative ~~have~~services. aFor ~~material~~further ~~impact~~information onregarding ~~the~~our ~~taxation~~agreements ofwith ~~the~~CF ~~Partnership~~Industries and ~~could~~the ~~have~~General aPartner, ~~material~~see ~~adverse~~Note 10—Related ~~impact~~Party ~~on unitholder distributions~~Transactions. ~~We continue to monitor these IRS regulatory activities.~~

~~Throughout~~We ~~this~~are ~~document~~a master limited partnership (MLP). Partnerships are generally not subject to federal income tax, ~~references~~although publicly traded partnerships (such as TNCLP) are treated as corporations for federal income tax purposes (and therefore are subject to ~~"affiliates~~federal income tax), unless at least 90% of the ~~General~~partnership's ~~Partner~~gross income is "qualifying ~~refer~~income" toas ~~consolidated~~defined ~~subsidiaries~~in Section 7704 of CFthe ~~Industries~~Internal Revenue Code of 1986, ~~including~~as ~~TNGP.~~amended, CFand ~~Industries~~the ~~acquired~~partnership ~~Terra~~is ~~Industries,~~not ~~Inc.~~required ~~(Terra)~~to inregister ~~April~~as ~~2010,~~an ~~and~~investment ~~acquired~~company under the ~~General~~Investment ~~Partner~~Company ~~and~~Act ~~Terra's~~of ~~ownership~~1940. inAs we currently satisfy the ~~Partnership~~requirements atto ~~that~~be ~~time~~treated as a partnership for federal income tax purposes, no federal income taxes are paid by the Partnership.

On January 19, 2017, the Internal Revenue Service (IRS) issued final regulations on the types of income and activities that constitute or generate qualifying income of a MLP. For calendar year MLPs, the effective date of the regulations is January 1, 2018. The regulations have the effect of limiting the types of income and activities that qualify under the MLP rules, subject to certain transition provisions. The regulations define the activities that generate qualifying income from certain processing or refining and transportation activities with respect to any mineral or natural resource (including fertilizer) as activities that generate qualifying income, but the regulations reserve on specifics regarding fertilizer-related activities. However, the IRS has issued two private letter rulings to taxpayers in the fertilizer industry unrelated to TNCLP (one before and one after the issuance of the final regulations) which would indicate that each taxpayer's fertilizer manufacturing activities should produce qualifying income for purposes of determining whether 90% of the partnership's gross income is qualifying income under the final regulations. The entities to which these private letter rulings were issued would appear to operate nitrogen fertilizer manufacturing businesses that are similar to ours. While these private letter rulings provide some insight into the manner in which the IRS analyzed fertilizer manufacturing activities at the time these rulings were issued, these private letter rulings are specific to different entities. Thus, the IRS is not bound to follow them in respect of TNCLP, nor may we rely on them as precedent when determining whether we satisfy the MLP 90% gross income test. Any change in the federal income tax treatment of income from fertilizer-related activities as qualifying income could have a material impact on the taxation of the Partnership and could have a material adverse impact on unitholder distributions. We continue to monitor these IRS regulatory activities.

We make available free of charge through CF Industries' Internet website, www.cfindustries.com, all of our reports on Forms 10-K, 10-Q and 8-K and all amendments to those reports as soon as reasonably practicable after such material is filed electronically with, or furnished to, the Securities and Exchange Commission (SEC). Copies of the General Partner's Corporate Governance Guidelines and charters for the Audit Committee and Corporate Governance and Nominating Committee of the General Partner's Board of Directors (TNGP Board of Directors) are also available on CF Industries' Internet website. We will provide electronic or paper copies of these documents free of charge upon written request delivered to our principal executive offices at the address below. The SEC also maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC.

Our principal executive offices are located outside of Chicago, Illinois, at 4 Parkway North, Suite 400, Deerfield, Illinois 60015.

Product Tons and Nutrient Tons

Unless otherwise stated, we measure our production and sales volume in this Annual Report on Form 10-K in product tons, which represents the weight of the product measured in short tons (one short ton is equal to 2,000 pounds).

We also provide certain supplementary volume information measured in nutrient tons. Nutrient tons represent the weight of the product’s nitrogen content, which varies by product. Ammonia product tons represent 82% nitrogen content and UAN product tons assume a 32% nitrogen content basis.

Our Products

Our principal products are ammonia and UAN, which we manufacture at our Verdigris, Oklahoma facility. Our nitrogen products are used primarily by farmers to improve the yield and quality of their crops. Although ammonia and UAN are often interchangeable, each has its own characteristics, and customer product preferences vary according to the crop planted, soil and weather conditions, regional farming practices, relative prices and the cost and availability of appropriate storage, handling and application equipment.

Our historical sales of nitrogen fertilizer products are shown in the following table. The sales shown do not reflect product used internally in the manufacture of other products (for example, in ~~2016~~2017 we used approximately 0.7 8 million tons of ammonia in the production of UAN).

	2016			2015			2014
	Tons	Sales		Tons	Sales		Tons	Sales
	(tons in thousands; sales dollars in millions)
Nitrogen Fertilizer Products
Ammonia	409	$	132.2	418	$	199.5	331	$	150.7
UAN	1,759	284.4		1,668	379.2		1,937	494.4

Our gross margin was $226.8 million, $325.8 million and $386.7 million for the years ended December 31, 2016, 2015 and 2014, respectively.

Our Facilities

Our sole production facility, in Verdigris, Oklahoma, is the second largest UAN production facility in North America. It has two ammonia plants, two nitric acid plants and two UAN plants, providing us with some flexibility to adjust our product mix between ammonia and UAN. It has the annual capacity to produce approximately 1.2 million tons of ammonia (most of which is upgraded to UAN) and 2.0 million tons of UAN. The Verdigris facility represents approximately 5% of North American ammonia capacity and 13% of North American UAN capacity.

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TERRA NITROGEN COMPANY, L.P.



	2017			2016			2015
	Tons	Sales		Tons	Sales		Tons	Sales
	(tons in thousands; sales dollars in millions)
Nitrogen Fertilizer Products
Ammonia	480	$	123.8	409	$	132.2	418	$	199.5
UAN	1,909	271.8		1,759	284.4		1,668	379.2

Our gross margin was $156.7 million, $226.8 million and $325.8 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Our Facilities

The following table summarizes our nitrogen fertilizer production volume for the last three years.

	2016	2015	2014
	2017	2016	2015
	(tons in thousands)
Ammonia(1)	1,~~126~~241	1,~~109~~126	1,~~147~~109
UAN (32%)	1,~~739~~906	1,~~688~~739	1,~~942~~688

_______________________________________________________________________________


⁽¹⁾	Gross ammonia production, including amounts subsequently upgraded to UAN.

Our Verdigris location is well suited to serve the midwestern U.S. corn belt. Verdigris is strategically located on approximately 800 acres near Tulsa's Port of Catoosa on the Verdigris River. We lease a port terminal from the Tulsa-Rogers County Port Authority, which provides access to transport fertilizer by way of river barges. In addition, Verdigris is located on the Burlington Northern Santa Fe railroad, providing access to rail transport. We also have access to a 1,100-mile ammonia pipeline. The complex has on-site storage for 60,000 tons of ammonia and 100,000 tons of UAN, providing us with flexibility to handle temporary disruptions to shipping activities without impacting production.

Our capital expenditures are primarily related to plant maintenance and turnaround projects to sustain our asset base, to increase capacity, to improve plant efficiency and to comply with various environmental, health and safety requirements. Occasionally, we have had other capital expenditure projects related to items such as the installation of new plant control systems or construction of additional on-site storage~~, including the construction of a new 50,000 ton capacity UAN tank that was completed in 2015~~. Planned capital expenditures and plant turnarounds are subject to change due to delays in regulatory approvals and/or permitting, unanticipated increases in cost, changes in scope and completion time, performance of third parties, delay in the receipt of equipment, adverse weather, defects in materials and workmanship, labor or material shortages, transportation constraints, and other unforeseen difficulties. Capital expenditures also reduce the Available Cash (as defined in ~~our~~the ~~agreement~~TNCLP ofPartnership ~~limited partnership~~Agreement) for unitholder distributions.

Customers

We sell all of the nitrogen fertilizer products that we produce to affiliates of the General Partner, making itthem our only ~~customer~~customers.

Raw Materials

Natural gas is the principal raw material and primary fuel source used in our ammonia production process. In ~~2016~~2017, natural gas accounted for approximately 5851% of our total cost of goods sold for nitrogen fertilizers and a higher percentage of cash production costs (total production costs less depreciation and amortization). Our Verdigris facility has access to abundant, competitively-priced natural gas through a transportation arrangement connecting it to ONEOK Gas Transportation, L.L.C.'s intrastate pipeline system.

In ~~2016~~2017, our Verdigris facility consumed approximately 4144 million MMBtus of natural gas. We purchase natural gas from a variety of suppliers to maintain a reliable, competitively-priced supply of natural gas. We also use certain financial ~~instruments to hedge natural gas prices. For further information about our natural gas hedging activities, see Note 7—Derivative Financial Instruments.~~

Distribution

Our production facility in Verdigris is located near the agricultural areas of the midwestern United States, and has ready access to barge, truck and rail transportation. In addition, the Verdigris facility has access to an ammonia pipeline to transport product to high demand regions.

Competition

The market for nitrogen fertilizer products is global and intensely competitive. Competition in the nitrogen fertilizer market is based primarily on delivered price and to a lesser extent on customer service and product quality. During the peak demand periods, product availability and delivery time also play a role in the buying decisions of customers. Agrium Inc., Koch Nitrogen Company, CVR Partners, LP, LSB Industries, Inc. and CF Industries are all large North American-based producers of nitrogen fertilizer products. Additionally, Iowa Fertilizer Company and Yara BASF are expected to bring new nitrogen fertilizer production facilities located in North America on line in 2017. There is also significant competition from product sourced from other regions of the world, including some with lower natural gas or other feedstock costs.

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TERRA NITROGEN COMPANY, L.P.

instruments to hedge natural gas prices. For further information about our natural gas hedging activities, see Note 7—Derivative Financial Instruments.

Distribution

Competition

The market for nitrogen fertilizer products is global and intensely competitive. Competition in the nitrogen fertilizer market is based primarily on delivered price and to a lesser extent on customer service and product quality. During peak demand periods, product availability and delivery time also play a role in the buying decisions of customers. CF Industries, CVR Partners, LP, Iowa Fertilizer Company, Koch Nitrogen Company, LSB Industries, Inc. and Nutrien Ltd. (formed in January 2018 by the merger of Agrium Inc. and Potash Corporation of Saskatchewan Inc.) are all large North American-based producers of nitrogen fertilizer products. Additionally, Yara BASF is expected to bring new nitrogen fertilizer production facilities located in North America on line in 2018. There is also significant competition from product sourced from other regions of the world, including some with lower natural gas or other feedstock costs.

Seasonality

The fertilizer business is seasonal. However, the sales pattern of our business can change significantly from year to year due to weather conditions and other factors impacting the agricultural industry. The strongest demand for our products occurs during the spring planting season, with a second period of strong demand following the fall harvest. Wholesale buyers generally build inventories during the low demand periods of the year in order to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in sales volumes and net sales being the highest during the spring and working capital requirements being the highest just prior to the start of the spring planting season. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in planting schedules and purchasing patterns.

Environmental and Other Regulatory Matters

We are subject to numerous environmental, health and safety laws and regulations, including laws and regulations relating to land reclamation; the generation, treatment, storage, disposal and handling of hazardous substances and wastes; and the cleanup of hazardous substance releases. These laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act, the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), the Toxic Substances Control Act and various other federal, state and local statutes. Violations can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. In addition, environmental, health and safety laws and regulations may impose joint and several liability, without regard to fault, for cleanup costs on potentially responsible parties who have released or disposed of hazardous substances into the environment.

We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial expenditures. Our costs to comply with, or any liabilities under, these laws and regulations could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

Freeport-McMoRan Resource Partners, Limited Partnership (a former owner and operator of the Partnership's production facilities) has retained liability for certain environmental matters originating prior to the Partnership's acquisition of these facilities.

Environmental, Health and Safety Expenditures

Our environmental, health and safety capital expenditures in 2016 totaled approximately $3.5 million. In 2017 we estimate that we will spend approximately $0.8 million for environmental, health and safety capital expenditures. Environmental, health and safety laws and regulations are complex, change frequently and have tended to become more stringent over time. We expect that continued government and public emphasis on environmental issues will result in increased future expenditures for environmental controls at our operations. Such expenditures could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

Legislation and Regulation of Greenhouse Gases

We are subject to greenhouse gas (GHG) regulations. The United States Environmental Protection Agency (EPA) has issued federal GHG regulations that impact our facility, including a mandatory GHG reporting rule that required us to commence monitoring GHG emissions beginning on January 1, 2010 and begin reporting the previous year's emissions annually starting in 2011. In addition, if we seek to modify or expand our facility and as a result are required to obtain a Prevention of Significant Deterioration (PSD) air construction permit, we could be subject to pollution control requirements applicable to GHGs in addition to requirements applicable to conventional air pollutants. Such requirements may result in increased costs or delays in completing such facility modifications and expansions.

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TERRA NITROGEN COMPANY, L.P.

~~Paris Agreement is uncertain. If the Paris Agreement remains in effect~~Environmental, itHealth ~~could result in more aggressive efforts to reduce GHG emissions. There are substantial uncertainties as to the nature, stringency~~ and ~~timing~~Safety of any future regulations. More stringent GHG limitations, if they are enacted, are likely to have a significant impact on us because our production facility emits GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. In addition, to the extent GHG restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, our competitors may have cost or other competitive advantages over us.Expenditures

Our environmental, health and safety capital expenditures in 2017 totaled approximately $0.6 million. In 2018, we estimate that we will spend approximately $2.2 million for environmental, health and safety capital expenditures. Environmental, health and safety laws and regulations are complex, change frequently and have tended to become more stringent over time. We expect that continued government and public emphasis on environmental issues will result in increased future expenditures for environmental controls at our operations. Such expenditures could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

Legislation and Regulation of Greenhouse Gases

On December 12, 2015, 195 countries, including the United States, adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement is intended to provide a framework pursuant to which the parties to the agreement will attempt to hold the increase in global average temperatures to below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels. The Paris Agreement has been accepted by the United States and went into effect in November 2016. However, in June 2017 the United States announced its intention to withdraw from the Paris Agreement, subject to renegotiation of the Paris Agreement on terms more favorable to the United States. Under the terms of the Paris Agreement, the United States cannot formally provide notice of its withdrawal before November 2019, which would become effective one year after providing such notice. In the interim, it is unclear if the United States will comply with its commitments under the Paris Agreement. If the Paris Agreement remains in effect, it could result in more aggressive efforts to reduce GHG emissions. There are substantial uncertainties as to the nature, stringency and timing of any future regulations. More stringent GHG limitations, if they are enacted, are likely to have a significant impact on us because our production facility emits GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. In addition, to the extent GHG restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, our competitors may have cost or other competitive advantages over us.

New Source Performance Standards for Nitric Acid Plants

On August 14, 2012, the EPA issued a final regulation revising air emission standards applicable to newly constructed, reconstructed or modified nitric acid plants. The regulations will apply to our nitric acid plants if and when we undertake activities or operations that are considered modifications, including physical changes that would allow us to increase our production capacity at the plants. The regulations include certain provisions that could make it difficult for us to meet the limits on emissions of nitrogen oxides (NOx) notwithstanding pollution controls we may add to our plants, and, accordingly, the regulations could impact our ability to expand production at our existing plants. The EPA regulation did not include a limitation on emissions of nitrous oxide (a greenhouse gas).

Employees

TNCLP and TNGP have no employees. An affiliate of the General Partner provides services to us under the Services and Offtake Agreement.

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TERRA NITROGEN COMPANY, L.P.

ITEM 1A. RISK FACTORS.

In addition to the other information contained in this Annual Report on Form 10-K, you should carefully consider the factors discussed below before deciding to invest in TNCLP's common units. These risks and uncertainties could materially and adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

RISKS RELATED TO OUR PARTNERSHIP STRUCTURE

Common units are subject to the General Partner's call right, which, on February 7, 2018, the General Partner elected to exercise. As a result of the exercise of the call right, the General Partner will purchase all publicly traded common units on April 2, 2018 for $84.033 per common unit.

On February 7, 2018, TNCLP announced that, in accordance with Section 17.1 of the TNCLP Partnership Agreement, TNGP elected to exercise the right, assigned to TNGP by TNCLP, to purchase all of the issued and outstanding common units representing limited partner interests in TNCLP not already owned by TNGP or its affiliates (the Public Units).

The General Partner's discretion in determining the level of cash reserves may adversely affect our ability to make cash distributions to our unitholders.

Our cash distributions to our unitholders are based on Available Cash as defined in the TNCLP Partnership Agreement. The TNCLP Partnership Agreement provides that the General Partner may reduce Available Cash by establishing cash reserves for the proper conduct of our business or the business of the Operating Partnership (including reserves for future operating and capital needs), to provide funds for future distributions to our unitholders in any one or more of the next four quarters or to comply with applicable law or any agreement or obligation to which we or the Operating Partnership are a party or otherwise bound. These cash reserves will affect the amount of cash available for current distribution to our unitholders.

As a result of TNGP’s exercise of the right to purchase the Public Units, there will be no further cash distributions on the common units after the distribution payable February 28, 2018.

Our unitholders have limited voting rights and are not entitled to elect the General Partner or the General Partner's directors.

Unlike the holders of common stock in a corporation, our unitholders have only limited voting rights on matters affecting our business and, therefore, limited ability to influence management's decisions regarding our business. Unitholders have no right to elect the General Partner or the TNGP Board of Directors on an annual or other continuing basis. The TNGP Board of Directors, including the independent directors, is chosen entirely by CF Industries as the indirect owner of the General Partner and not by our common unitholders. Unlike publicly traded corporations, we do not hold annual meetings of our unitholders to elect directors or conduct other matters routinely conducted at annual meetings of shareholders. Furthermore, even if our unitholders are dissatisfied with the performance of the General Partner, the General Partner may only be removed by a vote of the holders of at least 66 2/3% of our outstanding common units, including any common units held by the General Partner and its affiliates (including CF Industries). As a result, given that the General Partner and its affiliates own approximately 75.1% of our outstanding common units, holders of our publicly traded common units are not able to remove the General Partner under any circumstances.

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TERRA NITROGEN COMPANY, L.P.

The control of the General Partner may be transferred to a third party without unitholder consent.

There is no restriction in the TNCLP Partnership Agreement on the ability of CF Industries to transfer its equity interest in the General Partner to a third party. The new equity owner of the General Partner would then be in a position to replace the TNGP Board of Directors and the officers of the General Partner with its own choices and to influence the decisions taken by the TNGP Board of Directors and officers of the General Partner.

The TNGP Board of Directors and officers of the General Partner have fiduciary duties to TNGP and its stockholders, and the interests of TNGP and its stockholders may differ significantly from, or conflict with, the interests of our public common unitholders.

The General Partner is responsible for managing us. Although the General Partner has, as limited and reduced by the TNCLP Partnership Agreement, fiduciary duties to manage us in a manner that is beneficial to our common unitholders, the directors and officers of the General Partner also have fiduciary duties to manage the General Partner in a manner beneficial to TNGP and its stockholders. The interests of TNGP and its stockholders may differ from, or conflict with, the interests of our common unitholders. In resolving these conflicts, the General Partner may favor its own interests or the interests of holders of TNGP's common stock over our interests and those of our common unitholders.

The potential conflicts of interest include, among others, the following:


•	the General Partner's determination of the amount of our cash expenditures, borrowings and reserves;


•	the issuance of additional units or the purchase, call, or redemption of outstanding units;


•	transactions with CF Industries and its affiliates;


•	the decision to retain separate counsel, accountants or others to perform services on our behalf;


•	the decision by affiliates of the General Partner to engage in activities that would compete with us; and

•

the fact that all executive officers of the General Partner, and the majority of the directors of the General Partner, also serve as executive officers of CF Industries. Such executive officers, including the General Partner's chief executive officer, chief financial officer and senior vice presidents, divide their time between our business and the business of CF Industries. These executive officers will face conflicts of interest from time to time in making decisions which may benefit either us or CF Industries.

The TNCLP Partnership Agreement limits the liability and reduces the fiduciary duties of the General Partner and restricts the remedies available to us and our common unitholders for actions taken by the General Partner that might otherwise constitute breaches of fiduciary duty.

The TNCLP Partnership Agreement limits the liability and reduces the fiduciary duties of the General Partner and its directors and officers, while also restricting the remedies available to our common unitholders for actions that, without these limitations and reductions, might constitute breaches of fiduciary duty. For example:


•	The TNCLP Partnership Agreement provides that none of the General Partner, any of its affiliates, or any director or officer of the General Partner or any of its affiliates will have any liability for monetary damages to us or our unitholders for any act or omission if such person acted in good faith.

•

The TNCLP Partnership Agreement provides broad flexibility for the directors and officers of the General Partner to be involved in the management of the businesses of the owners of the General Partner, including any businesses that are in competition with our business, and specifically permits the owners of the General Partner to engage in activities that are competitive with our business. The TNCLP Partnership Agreement provides that no such activities will constitute a breach of any fiduciary duty owed by the General Partner.

•

The TNCLP Partnership Agreement provides that in connection with its resolution of any conflict of interest by the General Partner, the General Partner may consider: the relative interests of any party involved in such conflict or affected by such action, agreement, transaction or situation and the benefits and burdens relating to such interest, as well as any additional factors as the General Partner determines in its sole discretion to be relevant, reasonable or appropriate under the circumstances. The TNCLP Partnership Agreement further provides that, in the absence of bad faith by the General Partner, the resolution provided by the General Partner with respect to any conflict of interest will not constitute a breach of the TNCLP Partnership Agreement or any standard of care or duty imposed in the TNCLP Partnership Agreement or under any law, rule or regulation.

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TERRA NITROGEN COMPANY, L.P.

By purchasing a common unit, a unitholder becomes bound by the provisions of the TNCLP Partnership Agreement, including the provisions described above.

CF Industries and its affiliates are also engaged in fertilizer manufacturing.

The TNCLP Partnership Agreement does not prohibit CF Industries and its affiliates, other than TNGP, from owning and operating nitrogen fertilizer manufacturing plants and storage and distribution assets or engaging in any businesses which could compete with our business. In addition, CF Industries has recently constructed certain assets related to our business and may in the future acquire, construct or dispose of additional assets related to our business, without any obligation to offer us the opportunity to purchase or construct any of these assets.

As a publicly traded partnership we qualify for, and are relying on, certain exemptions from the corporate governance requirements of the NYSE.

As a publicly traded partnership, we qualify for, and are relying on, certain exemptions from the NYSE's corporate governance requirements, including:


•	the requirement that a majority of the TNGP Board of Directors consist of independent directors; and


•	the requirement that the TNGP Board of Directors have a compensation committee that is composed entirely of independent directors.

As a result of these exemptions, the TNGP Board of Directors is not comprised of a majority of independent directors, and the TNGP Board of Directors did not establish a compensation committee. Accordingly, unitholders do not have the same protections afforded to equity holders of companies that are subject to all of the corporate governance requirements of the NYSE.

Limited partners of TNCLP may not have limited liability if a court finds that unitholder action constitutes control of our business.

A general partner of a limited partnership generally has unlimited liability for the obligations of the partnership, except for those contractual obligations of the partnership that are expressly made without recourse to the general partner. TNCLP is organized under Delaware law and the Operating Partnership conducts business in Oklahoma. Limited partners of TNCLP (Limited Partners) could be liable for our obligations as if such Limited Partners were general partners if a court or government agency determined that:


•	we were conducting business in a state but had not complied with that particular state's partnership statute; or


•	Limited Partners' right to act with other unitholders to remove or replace the General Partner, to approve some amendments to the TNCLP Partnership Agreement or to take other actions under the TNCLP Partnership Agreement constituted "control" of our business.

Unitholders may have liability to repay distributions.

In the event that (i) we make distributions to our unitholders when our nonrecourse liabilities exceed the sum of (a) the fair market value of our assets not subject to recourse liability and (b) the excess of the fair market value of our assets subject to recourse liability over such liability, or a distribution causes such a result, and (ii) a unitholder knows at the time of the distribution of such circumstances, such unitholder will be liable for a period of three years from the time of the impermissible distribution to repay the distribution under Section 17-607 of the Delaware Revised Uniform Limited Partnership Act (the Delaware Act).

Likewise, upon the winding up of TNCLP, in the event that (a) we do not distribute assets in the following order: (i) to creditors in satisfaction of their liabilities; (ii) to partners and former partners in satisfaction of liabilities for distributions owed under the TNCLP Partnership Agreement; (iii) to partners for the return of their contribution; and (iv) to the partners in the proportions in which the partners share in distributions, and (b) a unitholder knows at the time of such circumstances, then such unitholder will be liable for a period of three years from the impermissible distribution to repay the distribution under Section 17-804 of the Delaware Act.

A purchaser of common units who becomes a Limited Partner is liable for the obligations of the transferring Limited Partner to make contributions to TNCLP that are known by the purchaser at the time it became a Limited Partner, and for unknown obligations if the liabilities could be determined from the TNCLP Partnership Agreement.

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TERRA NITROGEN COMPANY, L.P.

We may issue additional common units and other equity interests without unitholder approval, which would dilute unitholders' existing interests.

Under the TNCLP Partnership Agreement, we are authorized to issue an unlimited number of additional interests without a vote of the unitholders. The issuance by us of additional common units or other equity interests of equal or senior rank will have the following effects:


•	the proportionate ownership interest of unitholders immediately prior to the issuance will decrease;


•	the amount of cash distributions on each unit will decrease;


•	the ratio of our taxable income to distributions may increase;


•	the relative voting strength of each previously outstanding unit will be diminished; and


•	the market price of the common units may decline.

RISKS RELATED TO OUR BUSINESS

We are wholly dependent on our Verdigris manufacturing facility, and any operational disruption could result in a reduction of sales volumes and could cause us to incur substantial expenditures.

Our manufacturing operations, located at a single site in Verdigris, Oklahoma, are subject to significant operating hazards and interruptions. Any significant curtailment of production at one or more of our production units could result in materially reduced revenues and cash flows for the duration of any shutdown. Operations at our manufacturing facility could be curtailed or partially or completely shut down, temporarily or permanently, as the result of a number of circumstances, most of which are not within our control, such as unscheduled maintenance or catastrophic events like a major accident or fire, damage by severe weather or other natural disaster or sabotage or terrorist incidents. The manufacturing operations at our facility could also be subject to interruption if our ammonia storage facilities were to be removed from service due to damage from an accident or natural disaster or sabotage or terrorist incidents, or due to problems discovered during inspections associated with long-term maintenance or safety requirements.

Our business is cyclical, resulting in periods of industry oversupply during which our financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders tend to be negatively affected.

Historically, selling prices for our products have fluctuated in response to periodic changes in supply and demand conditions. Demand is affected by planted acreage, crop selection and fertilizer application rates, driven by population growth, or changes in dietary habits and non-food ~~usage~~use of crops, such as ~~the~~ production of ethanol and other biofuels, among other things. Supply is affected by available capacity and operating rates, raw material costs and availability, government policies and global trade.

Periods of strong demand, high capacity utilization and increasing operating margins tend to stimulate global investment in production capacity. The construction of new nitrogen fertilizer manufacturing capacity in the industry, plus improvements to increase output from the existing production assets, increase nitrogen supply availability and affect the balance of supply and demand ~~balance~~. In recent years, fertilizer producers, including CF Industries, have built new production facilities or expanded capacity of existing production assets, or announced plans to do so. InGlobal ~~the current environment, global~~ nitrogen fertilizer ~~supply~~capacity has increased faster than global nitrogen fertilizer demand, creating a surplus of global nitrogen fertilizer ~~oversupply~~capacity leading to lower nitrogen fertilizer selling prices. ~~Lower global production costs driven by lower feedstock costs and foreign exchange rate changes, and reduced ocean freight costs, have further contributed to the lower priced environment.~~

InSelling ~~2016, selling~~ prices reached multi-year lows ~~last seen~~ in ~~2009~~2017. The average selling price for our products in ~~2016~~2017 was $~~193~~166 per ton, compared to $193 per ton in 2016 and $279 per ton in 2015,. aSelling ~~decrease~~prices ofdecreased 14% from 2016 to 2017 and 31% from 2015 to 2016.

Additional production capacity ~~has recently come on line, including capacity from CF Industries’ expansion projects, and more production capacity~~ is expected to come on line over the next 12twelve months. We cannot predict the extent to which the current oversupply environment, global or local economic and financial conditions or changes in such conditions, or other factors may cause delays, cancellation or acceleration of other announced and/or ongoing projects. Should imports of nitrogen fertilizer products into the United States continue, and not take this additional capacity into account, we could see a decline in pricing or potentially experience lower prices than those we saw in the spring and summer of 2017. We also cannot predict the closures or operating rates of existing installed capacity.

We expect the lower priced environment to continue until global supply and demand become more balanced through a combination of continued demand growth and supply reductions as producers respond to lower realized margins by taking higher cost production facilities off line.9

During periods of industry oversupply, our financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders tend to be affected negatively as the price at which we sell our products typically declines, resulting in possible reduced profit margins, write-downs in the value of our inventory and temporary or permanent curtailments of production. Our financial performance, the amount of our cash distributions, and the trading price for our common units have been negatively impacted by the lower selling prices resulting from the current global oversupply of nitrogen fertilizer. The period of time that these conditions will persist and the degree to which they will impact our business, financial condition, results of operations, cash flows and ability to pay cash distributions are uncertain.

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TERRA NITROGEN COMPANY, L.P.

Our products are global commodities, and we face intense global competition from other fertilizer producers.

We are subject to intense price competition from our competitors. Most fertilizers are global commodities, with little or no product differentiation, and customers make their purchasing decisions principally on the basis of delivered price and to a lesser extent on customer service and product quality.

We compete with many producers, including state-owned and government-subsidized entities. Consolidation in the industry ~~has~~may ~~increased, and future consolidation is expected to further~~ increase, the resources of several of our competitors. For example, in ~~September~~January ~~2016~~2018, our competitors Agrium Inc. and Potash Corporation of Saskatchewan Inc. ~~announced~~completed ~~plans~~their tomerger ~~merge~~into the newly-formed company Nutrien Ltd. Some of our competitors have greater total resources and are less dependent on earnings from fertilizer sales, which make them less vulnerable to industry downturns and better positioned to pursue new expansion and development opportunities. Furthermore, certain governments as owners of some of our competitors may be willing to accept lower prices and profitability on their products in order to support domestic employment or other political or social goals. Our competitive position could suffer to the extent we are not able to expand our own resources, either through investments in new or existing operations or through acquisitions, joint ventures or partnerships.

China, the world's largest producer and consumer of nitrogen fertilizers, currently has significant capacity surplus and many high-cost plants. As a result, the domestic nitrogen industry in China is operating at ~~low~~less ~~rates~~than full capacity. If Chinese government policy, devaluation of the Chinese renminbi or decreases in Chinese producers' underlying costs such as the price of Chinese coal encourage increased production capacity utilization, ~~the~~any resulting export volume could adversely affect the balance between global supply and demand and may put downward pressure on global fertilizer prices, which could materially adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

A decline in U.S. agricultural production or limitations on the use of our products for agricultural purposes could materially adversely affect the demand for our products.

Conditions in the U.S. agricultural industry significantly impact our operating results. ~~The~~Agricultural ~~U.S.~~planted ~~agricultural~~areas ~~industry~~and production can be affected by a number of factors, including weather patterns and field conditions, current and projected grain inventories and prices, ~~domestic and international~~ demand for ~~U.S.~~ agricultural products and ~~U.S.~~governmental ~~and foreign~~ policies regarding production of or trade in agricultural products. These factors are outside of our control.

~~State~~Governmental ~~and federal governmental~~ policies, including farm and biofuel subsidies and commodity support programs, as well as the prices of fertilizer products, may also directly or indirectly influence the number of acres planted, the mix of crops planted and the use of fertilizers for particular agricultural applications. Ethanol production in the United States contributes significantly to corn demand, due in part to federal legislation mandating use of renewable fuels. An increase in ethanol production has led to an increase in the amount of corn grown in the United States and to increased fertilizer usage on both corn and other crops that have also benefited from improved farm economics. While the current Renewable Fuel Standard (RFS) encourages continued high levels of corn-based ethanol production, a continuing "food versus fuel" debate and other factors have resulted in calls to eliminate or reduce the renewable fuel mandate, or to eliminate or reduce corn-based ethanol as part of the renewable fuel mandate. This could have an adverse effect on corn-based ethanol production, planted corn acreage and fertilizer demand.

Developments in crop technology, such as nitrogen fixation, the conversion of atmospheric nitrogen into compounds that plants can assimilate, or nitrogen-efficient varieties, could also reduce the use of chemical fertilizers and adversely affect the demand for our products. Widespread adoption of emerging application technologies could disrupt traditional application practices, affecting the volume or types of products used and timing of applications. In addition, from time to time various state legislatures have considered limitations on the use and application of chemical fertilizers due to concerns about the impact of these products on the environment. Any reduction in the demand for chemical fertilizer products, including any limitation on the use and application of chemical fertilizer, could affect the demand for our products, which could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

~~Our business is dependent on North American natural gas, the prices of which are subject to volatility.~~10

Natural gas is the principal raw material used to produce nitrogen fertilizers. We use natural gas both as a chemical feedstock and as a fuel to produce our nitrogen products. Natural gas comprises a significant portion of the total production cost of our products. The price of natural gas in North America has been volatile in recent years. During 2016, the daily closing price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, reached a low of $1.49 per MMBtu on three consecutive days in March 2016 and a high of $3.77 per MMBtu on December 8, 2016. During the three year period ended December 31, 2016, the daily closing price at the Henry Hub reached a low of $1.49 per MMBtu on three consecutive days in March 2016 and a high of $7.94 per MMBtu on March 5, 2014.

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TERRA NITROGEN COMPANY, L.P.

~~Changes in~~ the ~~supply~~use of and ~~demand~~application ~~for natural gas can lead to periods~~ of ~~volatile~~chemical ~~natural~~fertilizer, ~~gas~~could ~~prices.~~affect Ifthe ~~high~~demand ~~prices~~for ~~were~~our ~~to occur during a period of low fertilizer selling prices~~products, itwhich could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. We sell all of our output of fertilizer products to affiliates of the General Partner at prices determined based on market prices for our fertilizer products as defined in the Services and Offtake Agreement.

Our business is dependent on North American natural gas, the prices of which are subject to volatility.

Natural gas is the principal raw material used to produce nitrogen fertilizers. We use natural gas both as a chemical feedstock and as a fuel to produce our nitrogen products. Natural gas comprises a significant portion of the total production cost of our products. The price of natural gas in North America has been volatile in recent years. During 2017, the daily closing price at the Henry Hub, the most heavily-traded natural gas pricing point in North America, reached a low of $2.44 per MMBtu on February 28, 2017 and a high of $3.65 per MMBtu on three consecutive days in January 2017. During the three year period ended December 31, 2017, the daily closing price at the Henry Hub reached a low of $1.49 per MMBtu on three consecutive days in March 2016 and a high of $3.77 per MMBtu on December 8, 2016.

Changes in the supply of and demand for natural gas can lead to periods of volatile natural gas prices. If high prices were to occur during a period of low fertilizer selling prices, it could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. We sell all of our output of nitrogen fertilizer products to affiliates of the General Partner at prices based on market prices for our nitrogen fertilizer products as defined in the Services and Offtake Agreement.

The price of natural gas in North America and worldwide has been volatile in recent years and has declined on average due in part to the development of significant natural gas reserves, including shale gas, and the rapid improvement in shale gas extraction techniques, such as hydraulic fracturing and horizontal drilling. Future production of natural gas from shale formations could be reduced by regulatory changes that restrict drilling or hydraulic fracturing or increase its cost or by reduction in oil exploration and development prompted by lower oil prices and resulting in production of less associated gas. Additionally, increased demand for natural gas, particularly in the Gulf Coast Region, due to increased industrial demand and increased natural gas exports could result in increased natural gas prices. If such reduced production or increased demand were to occur, or if other developments adversely impact the supply/demand balance for natural gas in the United States or elsewhere, natural gas prices could rise, which could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

Our operations are dependent upon raw materials provided by third parties, and any delay or interruption in the delivery of raw materials may adversely affect our business.

We use natural gas and other raw materials in the manufacture of ~~fertilizers~~nitrogen fertilizer products. We purchase the natural gas and other raw materials from third party suppliers. Our natural gas is transported by pipeline to our facility by third party transportation providers or through the use of facilities owned by third parties. Delays or interruptions in the delivery of natural gas or other raw materials may be caused by, among other things, severe weather or natural disasters, unscheduled downtime, labor difficulties, insolvency of our suppliers or their inability to meet existing contractual arrangements, deliberate sabotage and terrorist incidents, or mechanical failures. In addition, the transport of natural gas by pipeline is subject to additional risks, including delays or interruptions caused by capacity constraints, leaks or ruptures. Any delay or interruption in the delivery of natural gas or other raw materials, even for a limited period, could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

Our transportation and distribution activities rely on third party providers and are subject to environmental, safety and regulatory oversight. This exposes us to risks and uncertainties beyond our control that may adversely affect our operations and exposes us to additional liability.

We rely on railroad, truck, pipeline, and river barge companies to transport raw materials to our manufacturing complex, to coordinate and deliver finished products into CF Industries' distribution system and to ship finished products to CF Industries' customers. We also lease rail cars in order to ship raw materials and finished products. These transportation operations, equipment and services are subject to various hazards, including adverse operating conditions on the inland waterway system, extreme weather conditions, system failures, work stoppages, delays, accidents such as spills and derailments and other accidents and operating hazards. Additionally, due to the aging infrastructure of certain bridges, roadways, rail lines, river locks, and equipment that our third party service providers utilize, we may experience delays in the shipment of finished product while repairs, maintenance or replacement activities are conducted. Also, certain third party service providers, particularly railroads, have experienced periodic service slowdowns due to capacity constraints in their systems, operational and maintenance difficulties and other events, which impact the shipping times of our products.

These transportation operations, equipment and services are also subject to environmental, safety, and regulatory oversight. Due to concerns related to accidents, discharges or other releases of hazardous substances, terrorism or the potential ~~use of fertilizers as explosives, local, state and federal governments could implement new regulations affecting the transportation of raw materials or finished products.~~

If shipping of our products is delayed as a result of these transportation companies' failure to operate properly, or if new and more stringent regulatory requirements are implemented affecting transportation operations or equipment, or if there are significant increases in the cost of these services or equipment, our revenues and cost of operations could be adversely affected. 11

The railroad industry continues various efforts to limit the railroads' potential liability stemming from the transportation of Toxic Inhalation Hazard materials, such as the anhydrous ammonia that we transport to and from our facilities. For example, various railroads have implemented tariffs that include provisions that purport to shift liability to shippers to the extent that liabilities arise from third parties with insufficient resources. These initiatives could materially and adversely affect operating expenses and potentially our ability to transport anhydrous ammonia and increase our liability for releases of our anhydrous ammonia while in the care, custody and control of the railroads, for which our insurance may be insufficient or unavailable. New regulations also could be implemented affecting the equipment used to ship our raw materials or finished products.

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TERRA NITROGEN COMPANY, L.P.

~~Increases~~use inof ~~transportation~~fertilizers ~~costs,~~as ~~or changes in such costs relative to transportation costs incurred by our competitors~~explosives, ~~and~~governmental ~~any~~entities ~~railroad industry initiatives that may impact our ability to transport our products,~~ could ~~have~~implement anew ~~material~~or ~~adverse~~more ~~effect~~stringent onregulatory ~~our~~requirements ~~business,~~affecting ~~financial~~the ~~condition,~~transportation ~~results~~ of ~~operations,~~raw ~~cash~~materials ~~flows~~or ~~and~~finished ~~ability to pay cash distributions to unitholders~~products.

If shipping of our products is delayed or we are unable to obtain raw materials as a result of these transportation companies' failure to operate properly, or if new and more stringent regulatory requirements are implemented affecting transportation operations or equipment, or if there are significant increases in the cost of these services or equipment, our revenues and cost of operations could be adversely affected.

In the United States, the railroad industry continues various efforts to limit the railroads' potential liability stemming from the transportation of Toxic Inhalation Hazard materials, such as the anhydrous ammonia that we transport to and from our facility. For example, various railroads shift liability to shippers by contract, purport to shift liability to shippers by tariff, or otherwise seek to require shippers to indemnify and defend the railroads from and against liabilities (including in negligence, strict liability, or statutory liability) that may arise from certain acts or omissions of the railroads, third parties with insufficient resources, unknown causes or acts of god. These initiatives could materially and adversely affect our operating expenses and potentially our ability to transport anhydrous ammonia and increase our liability for releases of our anhydrous ammonia while in the care, custody and control of the railroads or third parties, for which our insurance may be insufficient or unavailable. New or more stringent regulatory requirements also could be implemented affecting the equipment used to ship our raw materials or finished products. Restrictions on service, increases in transportation costs, or changes in such costs relative to transportation costs incurred by our competitors, and any railroad industry initiatives that may impact our ability to transport our products, could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

Our operations and the production and handling of our products involve significant risks and hazards. We are not fully insured against all potential hazards and risks incident to our business. Therefore, our insurance coverage may not adequately cover our losses.

Our operations are subject to hazards inherent in the manufacture, transportation, storage and distribution of chemical products, including ammonia, which is highly toxic and corrosive. These hazards include: explosions; fires; severe weather and natural disasters; train derailments, collisions, ~~vessel groundings~~ and other transportation and maritime incidents; leaks and ruptures involving storage tanks, pipelines and rail cars; spills, discharges and releases of toxic or hazardous substances or gases; deliberate sabotage and terrorist incidents; mechanical failures; unscheduled plant downtime; labor difficulties and other risks. Some of these hazards can cause bodily injury and loss of life, severe damage to or destruction of property and equipment and environmental damage, and may result in suspension of operations and the imposition of civil or criminal penalties and liabilities.

We are currently insured under CF Industries' property, business interruption, casualty and liability insurance policies, but we are not fully insured against all potential hazards and risks incident to our business. If we were to incur significant liability for which we were not fully insured, it could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. CF Industries' insurance policies are subject to various self-retentions, deductibles and limits. The policies also contain exclusions and conditions that could have a material adverse impact on our ability to receive indemnification thereunder. CF Industries' insurance policies are generally renewed annually. As a result of market conditions, insurance premiums, self-retentions and deductibles for certain insurance policies can increase substantially and, in some instances (including if CF Industries had fully utilized the purchased coverage), certain insurance may become unavailable or available only for reduced amounts of coverage. In addition, significantly increased costs could lead CF Industries to decide to reduce, or possibly eliminate, coverage. There can be no assurance that CF Industries or we will be able to buy and maintain insurance with adequate limits and reasonable pricing terms and conditions.

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Cyber security risks could result in disruptions in business operations and adverse operating results.

The information management systems that we use are those provided by CF Industries, while we own the computer control systems that operate our plants. We rely on information technology and computer control systems in many aspects of our business, including internal and external communications, the management of our accounting, financial and supply chain functions and plant operations. Business and supply chain disruptions, plant and utility outages and information technology system and network disruptions due to cyber attacks could seriously harm our operations and materially adversely affect our operating results. Cyber security risks include attacks on information technology and infrastructure by hackers, damage or loss of information due to viruses, the unintended disclosure of confidential information, the misuse or loss of control over computer control systems, and breaches due to employee error. Our exposure to cyber security risks includes exposure through third parties on whose systems we place significant reliance for the conduct of our business. We routinely review and implement security procedures and measures in order to protect our systems and information from being vulnerable to evolving cyber attacks. We believe these measures and procedures are appropriate. However, we may not have the resources or technical sophistication to anticipate, prevent, or recover from rapidly evolving types of cyber attacks. Compromises to our information and control systems could have severe financial and other business implications.

Adverse weather conditions may decrease demand for our fertilizer products, increase the cost of natural gas or materially disrupt our operations.

Weather conditions that delay or disrupt field work during the planting, growing, harvesting or application periods may cause agricultural customers to use different forms of nitrogen fertilizer, which may adversely affect demand for the forms that we sell or may impede farmers from applying our fertilizers until the following application period, resulting in lower demand for our products.

Adverse weather conditions during or following harvest may delay or eliminate opportunities to apply fertilizer in the fall. Weather can also have an adverse effect on crop yields, which could lower the income of growers and impair their ability to purchase fertilizer from CF Industries' customers. Our quarterly financial results can vary significantly from one year to the next due to weather-related shifts in planting schedules and purchasing patterns.

Weather conditions or, in certain cases, weather forecasts, also can affect the price of natural gas, the principal raw material used to make our nitrogen fertilizer products. Colder than normal winters and warmer than normal summers increase the demand for natural gas for power generation and for residential and industrial use, which can increase the cost and/or decrease the availability of natural gas. In addition, adverse weather events such as very low temperatures leading to well freeze-offs or hurricanes affecting the Gulf of Mexico coastal states can impact the supply of natural gas and cause prices to rise.

9We are subject to numerous environmental, health and safety laws, regulations and permitting requirements, as well as potential environmental liabilities, which may require us to make substantial expenditures.

We are subject to numerous environmental, health and safety laws and regulations in the United States, including laws and regulations relating to the generation and handling of hazardous substances and wastes; the cleanup of hazardous substance releases; the discharge of regulated substances to air or water; and the demolition of existing plant sites upon permanent closure. These laws include the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act, CERCLA, the Toxic Substances Control Act and various other federal, state and local statutes.

As a producer of nitrogen fertilizer products working with hazardous substances, our business faces risks of spills, discharges or other releases of those substances into the environment. Certain environmental laws, including CERCLA, impose joint and several liability, without regard to fault, for cleanup costs on persons who have disposed of or released hazardous substances into the environment. Given the nature of our business, we have incurred, are incurring currently, and are likely to incur periodically in the future, liabilities under CERCLA and other environmental cleanup laws at our facility, adjacent or nearby third-party facilities or offsite disposal locations. The costs associated with future cleanup activities that we may be required to conduct or finance may be material. Additionally, we may become liable to third parties for damages, including personal injury and property damage, resulting from the disposal or release of hazardous substances into the environment.

Violations of environmental, health and safety laws can result in substantial penalties, court orders to install pollution-control equipment, civil and criminal sanctions, permit revocations and facility shutdowns. Environmental, health and safety laws change regularly and have tended to become more stringent over time. As a result, we have not always been and may not always be in compliance with all environmental, health and safety laws and regulations. We may be subject to more stringent enforcement of existing or new environmental, health and safety laws in the future. Additionally, future environmental, health and safety laws and regulations or reinterpretation of current laws and regulations may require us to make substantial

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~~decrease~~expenditures. ~~the~~Our ~~availability~~costs ofto ~~natural~~comply ~~gas. In addition~~with, ~~adverse~~or ~~weather~~any ~~events~~liabilities ~~such~~under, asthese ~~very~~laws ~~low~~and ~~temperatures~~regulations ~~leading~~could tohave ~~well~~a ~~freeze-offs~~material oradverse ~~hurricanes~~effect ~~affecting~~on ~~the~~our ~~Gulf~~business, offinancial ~~Mexico~~condition, ~~coastal~~results ~~states~~of ~~can~~operations, ~~impact~~cash ~~the~~flows ~~supply~~and ofability ~~natural~~to ~~gas~~pay ~~and~~cash ~~cause~~distributions ~~prices~~ to ~~rise~~unitholders.

We are subject to numerous environmental, health and safety laws, regulations and permitting requirements, as well as potential environmental liabilities, which may require us to make substantial expenditures.

As a fertilizer company working with hazardous substances, our business faces risks of spills, discharges or other releases of those substances into the environment. Certain environmental laws, including CERCLA, impose joint and several liability, without regard to fault, for cleanup costs on persons who have disposed of or released hazardous substances into the environment. Given the nature of our business, we have incurred, are incurring currently, and are likely to incur periodically in the future, liabilities under CERCLA and other environmental cleanup laws at our facility, adjacent or nearby third-party facilities or offsite disposal locations. The costs associated with future cleanup activities that we may be required to conduct or finance may be material. Additionally, we may become liable to third parties for damages, including personal injury and property damage, resulting from the disposal or release of hazardous substances into the environment.

From time to time, our production of anhydrous ammonia has resulted in accidental releases that have temporarily disrupted our manufacturing operations and resulted in liability for administrative penalties and claims for personal injury. To date, our costs to resolve these liabilities have not been material. However, we could incur significant costs if our liability coverage is not sufficient to pay for all or a large part of any judgments against us, or if our insurance carrier refuses coverage for these losses.

We hold numerous environmental and other governmental permits and approvals authorizing operations at our Verdigris facility. Expansion or modification of our operations is predicated upon securing necessary environmental or other permits or approvals. A decision by a government agency to deny or delay issuing a new or renewed regulatory material permit or approval, or to revoke or substantially modify an existing permit or approval, or a determination that we have violated a law or permit as a result of a governmental inspection of our facility could have a material adverse effect on our ability to continue operations at the Verdigris facility and on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. On October 126, 2015, the EPA released a final regulation lowering the national ambient air quality standard for ozone. Ozone attainment designations ~~are~~were ~~expected~~due by October 1, 2017. In November 2017, ~~and~~the ~~this~~EPA ~~action~~issued isa ~~expected~~partial tolist ~~result~~of air quality regions that are in ~~additional~~attainment ~~areas~~with ofthe 2015 ozone standard, but it has not yet promulgated the ~~country~~final ~~being~~list of air quality regions that will be classified as being in nonattainment with the ozone standard. ~~and~~These regions will be subject to more stringent permitting requirements, which in turn could make it much more difficult and expensive to obtain permits to construct new facilities or expand our existing operations.

Future regulatory restrictions on ~~greenhouse~~GHG ~~gas~~ emissions in the jurisdictions in which we operate could materially adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

We are subject to GHG regulations. In the United States, our existing facility currently is only subject to GHG emissions reporting, although any new or modified facility is likely to be subject to GHG emissions standards included in their air permits. There are substantial uncertainties as to the nature, stringency and timing of any future GHG regulations. On December 12, 2015, 195 countries adopted by consensus a new international agreement known as the Paris Agreement. The Paris Agreement ishas ~~intended~~been toaccepted ~~provide~~by athe ~~framework~~United ~~pursuant~~States toand ~~which~~went ~~the~~into ~~parties~~effect toin ~~the~~November ~~agreement~~2016. ~~will~~However, ~~attempt~~in toJune ~~hold~~2017 the ~~increase~~United inStates ~~global~~announced ~~average~~its ~~temperatures~~intention to ~~below~~withdraw 2from °Cthe ~~above~~Paris ~~pre-industrial~~Agreement, ~~levels~~subject ~~and~~ to ~~pursue~~renegotiation ~~efforts~~of tothe ~~limit~~Paris ~~the~~Agreement ~~temperature~~on ~~increase~~terms tomore ~~1.5~~favorable °Cto ~~above~~the ~~pre-industrial~~United ~~levels~~States. ~~The~~ ~~Paris~~Under ~~Agreement~~the ~~has~~terms ~~been~~of ~~accepted~~the byParis Agreement, the United States ~~and~~cannot ~~went~~formally ~~into~~provide ~~effect~~notice inof ~~November~~its ~~2016.~~withdrawal ~~However~~before November 2019, aswhich awould ~~result~~become ofeffective ~~the~~one ~~recent~~year ~~presidential~~after ~~election~~providing such notice. In the interim, it is unclear if the United States ~~may~~will ~~decide~~comply towith ~~withdraw~~its ~~from~~commitments under the Paris Agreement. ~~(or~~If the ~~United~~Paris ~~Nations~~Agreement ~~Framework~~remains ~~Convention~~in oneffect, ~~Climate~~it ~~Change,~~could ~~which~~result ~~would~~in more aggressive efforts to reduce GHG emissions.

10More stringent GHG regulations, if they are enacted, are likely to have a significant impact on us, because our production facility emits GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. In addition, to the extent that GHG restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, our competitors may have cost or other competitive advantages over us.

Our operating results fluctuate due to seasonality.

The fertilizer business is seasonal. However, the sales pattern of our business can change significantly from year to year due to conditions impacting the agricultural industry and other factors. The strongest demand for fertilizer products occurs during the spring planting season, with a second period of strong demand following the fall harvest. Wholesale buyers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in sales volumes and net sales being the highest during the spring and working capital requirements being the highest just prior to the start of the spring planting season.

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also result in withdrawal from the Paris Agreement) or, prior to taking such actions, could disregard its commitments under the Paris Agreement. The impact of such actions, if they take place, on the future implementation of the Paris Agreement is uncertain. If the Paris Agreement remains in effect, it could result in more aggressive efforts to reduce GHG emissions. More stringent GHG limitations, if they are enacted, are likely to have a significant impact on us, because our production facility emits GHGs such as carbon dioxide and nitrous oxide and because natural gas, a fossil fuel, is a primary raw material used in our nitrogen production process. Regulation of GHGs may require us to make changes in our operating activities that would increase our operating costs, reduce our efficiency, limit our output, require us to make capital improvements to our facilities, increase our costs for or limit the availability of energy, raw materials or transportation, or otherwise materially adversely affect our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders. In addition, to the extent that GHG restrictions are not imposed in countries where our competitors operate or are less stringent than regulations that may be imposed in the United States, our competitors may have cost or other competitive advantages over us.

Our operating results fluctuate due to seasonality.

The fertilizer business is seasonal. However, the sales pattern of our business can change significantly from year to year due to weather conditions and other factors impacting the agricultural industry. The strongest demand for fertilizer products occurs during the spring planting season, with a second period of strong demand following the fall harvest. Wholesale buyers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales seasons. Seasonality is greatest for ammonia due to the short application season and the limited ability of our customers and their customers to store significant quantities of this product. The seasonality of fertilizer demand generally results in sales volumes and net sales being the highest during the spring and working capital requirements being the highest just prior to the start of the spring planting season.

As a result of this seasonality, you will not be able to rely on our operating results in any particular period as an indication of our future performance. In addition, as a consequence of our seasonality, our Available Cash for distributions can be volatile, and will vary quarterly and annually.

Our business is subject to risks involving derivatives, ~~including~~and the risk that our hedging activities might not prevent losses.

We often utilize natural gas derivatives to hedge our financial exposure to the price volatility of natural gas, the principal raw material used in the production of nitrogen-based fertilizers. We have used ~~fixed-price, physical purchase and sales contracts,~~ futures, financial swaps and option contracts traded in the over-the-counter markets or on exchanges.

Our use of derivatives can result in volatility in reported earnings due to the unrealized mark-to-market adjustments that occur from changes in the value of the derivatives that do not qualify for, or to which we do not apply, hedge accounting. To the extent that our derivative positions lose value, we may be required to post collateral with our counterparties, adversely affecting our liquidity and our ability to pay cash distributions to unitholders.

We have also used fixed-price, physical purchase and sales contracts to hedge our exposure to natural gas price volatility. Hedging arrangements are imperfect and unhedged risks will always exist. In addition, our hedging activities may themselves give rise to various risks that could adversely affect us. For example, we are exposed to counterparty credit risk when our derivatives are in a net asset position. The counterparties to our derivatives are multi-national commercial banks, major financial institutions or large energy companies. We monitor the derivative portfolio and credit quality of our counterparties and adjust the level of activity we conduct with individual counterparties as necessary. We also manage the credit risk through the use of multiple counterparties, credit limits, credit monitoring procedures, cash collateral requirements and master netting arrangements. However, our liquidity and cash available for distributions to unitholders could be negatively impacted by a counterparty default on settlement of one or more of our derivative financial instruments.

Our limited access to capital in a time of need could materially adversely impact our business.

We invest capital in our business to comply with environmental, health and safety regulations and policies, maintain our manufacturing assets, improve our production capabilities and capitalize on growth opportunities. The primary source of capital invested in our business is cash from operations. In the event that cash generated from operations is insufficient to fund capital investments, we would need to obtain additional funding in the form of loans or equity. Our ability to obtain such funding would be determined by market conditions at the time of the capital need. Our partnership structure, our reliance on a single manufacturing facility in Verdigris, Oklahoma and our reliance on affiliates of the General Partner as our only customer could impede our ability to obtain such capital, which could materially adversely impact our business, financial condition, results of operations, liquidity and ability to pay cash distributions to unitholders.

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Acts of terrorism and regulations to combat terrorism could negatively affect our business.

Like other companies with major industrial facilities, we may be the target of terrorist activities. Our Verdigris facility stores significant quantities of ammonia and other materials that can be dangerous if mishandled. Any damage to infrastructure facilities, such as electric generation, transmission and distribution facilities, or injury to employees, who could be direct targets or indirect casualties of an act of terrorism, may affect our operations. Any disruption of our ability to produce or distribute our products could result in a significant decrease in revenues and significant additional costs to replace, repair or insure our assets, which could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

InDue ~~addition, due~~ to concerns related to terrorism or the potential use of certain fertilizers as explosives, we are subject to various security laws and regulations. ~~These~~In the United States, these security laws include the Maritime Transportation Security Act of 2002 and the Chemical Facilities Anti-Terrorism Standards regulation. In addition, President Obama issued in 2013 Executive Order 13650 Improving Chemical Facility Safety and Security to improve chemical facility safety in coordination with owners and operators. Governmental entities could implement new or impose more stringent regulations affecting the security of our plants, ~~terminals~~ and ~~warehouses~~warehouse or the transportation and use of fertilizers. These regulations could result in higher operating costs or limitations on the sale of our products and could result in significant unanticipated costs, lower revenues and reduced profit margins.

In October 2016, the Department of Homeland Security (DHS) released its new Chemical Security Assessment Tool (CSAT 2.0) surveys and enhanced risk tiering methodology. Facilities that had previously submitted a survey response to the DHS were notified to resubmit responses to online questionnaires to be evaluated through the revised and enhanced risk tiering methodology. In April 2017, the DHS began sending tiering determination letters to chemical facilities based on the new methodology. Depending on the risk classification resulting from the application of CSAT 2.0, our plants and warehouse could be subject to more stringent requirements related to chemical security.

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We are dependent on CF Industries and its employees for the success of our business.

We are dependent on CF Industries for our success in a number of respects. CF Industries, through subsidiaries, purchases all of the production from our manufacturing facility and, together with its affiliates, provides certain services to us, including staffing, benefits, human resources administration, production planning, manufacturing management, procurement, logistics, accounting, legal, risk management, investor relations and other general and administrative services. CF Industries and its wholly-owned subsidiaries have debt and debt service requirements and we currently do not. Although CF Industries is affected by most of the factors that affect us, a higher level of debt could put CF Industries at greater risk than us in the event business conditions deteriorate materially. Our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders might be adversely affected by any financial or operational difficulties at CF Industries, including any potential default by CF Industries or its subsidiaries on their debt or any bankruptcy proceeding by CF Industries. Information regarding CF Industries can be obtained in its various filings with the SEC, including Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K.

Deterioration of global market and economic conditions could have a material adverse effect on our business, financial condition, results of operations, cash flows and ability to pay cash distributions to unitholders.

A slowdown of, or persistent weakness in, economic activity caused by a deterioration of global market and economic conditions could adversely affect our business in the following ways, among others: conditions in the credit markets could affect the ability of CF Industries' customers and their customers to obtain sufficient credit to support their operations and the failure of certain key suppliers could increase our exposure to disruptions in supply or to financial losses. We also may experience declining demand and falling prices for some of our products due to CF Industries' customers' reluctance to replenish inventories. Changes in global economic conditions can arise suddenly and the full impact of such changes can be difficult to ascertain, resulting in anxiety among market participants that can persist for protracted periods. For example, concern and uncertainty over the potential impact on the global economy of the referendum in the United Kingdom in June 2016, which resulted in a vote in favor of ~~exiting~~exting the European Union, has resulted in increased volatility in the global financial markets. The overall impact of changes in global economic conditions on us is difficult to predict, and our business could be materially adversely impacted.

In addition, conditions in the international market for nitrogen fertilizers significantly influence our operating results. The international market for fertilizers is influenced by such factors as currency exchange rates, including the relative value of the U.S. dollar and its impact upon the cost of importing of nitrogen fertilizers into the United States, foreign agricultural policies, the existence of, or changes in, import or foreign currency exchange barriers in certain foreign markets and the laws and policies of the markets in which we operate that affect foreign trade and investment.

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RISKS RELATED TO OUR PARTNERSHIP STRUCTURE

The General Partner's discretion in determining the level of cash reserves may adversely affect our ability to make cash distributions to our unitholders.

Our cash distributions to our unitholders are based on Available Cash as defined in our agreement of limited partnership. Our agreement of limited partnership provides that the General Partner may reduce Available Cash by establishing cash reserves for the proper conduct of our business or the business of the Operating Partnership (including reserves for future operating and capital needs), to provide funds for future distributions to our unitholders in any one or more of the next four quarters or to comply with applicable law or any agreement or obligation to which we or the Operating Partnership are a party or otherwise bound. These cash reserves will affect the amount of cash available for current distribution to our unitholders.

Our unitholders have limited voting rights and are not entitled to elect the General Partner or the General Partner's directors.

Unlike the holders of common stock in a corporation, our unitholders have only limited voting rights on matters affecting our business and, therefore, limited ability to influence management's decisions regarding our business. Unitholders have no right to elect the General Partner or the TNGP Board of Directors on an annual or other continuing basis. The TNGP Board of Directors, including the independent directors, is chosen entirely by CF Industries as the indirect owner of the General Partner and not by our common unitholders. Unlike publicly-traded corporations, we do not hold annual meetings of our unitholders to elect directors or conduct other matters routinely conducted at annual meetings of shareholders. Furthermore, even if our unitholders are dissatisfied with the performance of the General Partner, the General Partner may only be removed by a vote of the holders of at least 66 2/3% of our outstanding common units, including any common units held by the General Partner and its affiliates (including CF Industries). As a result, given that the General Partner and its affiliates own approximately 75.1% of our outstanding common units, holders of our publicly-traded common units are not able to remove the General Partner under any circumstances.

The control of the General Partner may be transferred to a third party without unitholder consent.

There is no restriction in our agreement of limited partnership on the ability of CF Industries to transfer its equity interest in the General Partner to a third party. The new equity owner of the General Partner would then be in a position to replace the TNGP Board of Directors and the officers of the General Partner with its own choices and to influence the decisions taken by the TNGP Board of Directors and officers of the General Partner.

The General Partner is responsible for managing us. Although the General Partner has, as limited and reduced by the agreement of limited partnership, fiduciary duties to manage us in a manner that is beneficial to our common unitholders, the directors and officers of the General Partner also have fiduciary duties to manage the General Partner in a manner beneficial to TNGP and its stockholders. The interests of TNGP and its stockholders may differ from, or conflict with, the interests of our common unitholders. In resolving these conflicts, the General Partner may favor its own interests or the interests of holders of TNGP's common stock over our interests and those of our common unitholders.

The potential conflicts of interest include, among others, the following:

• the General Partner's determination of the amount of our cash expenditures, borrowings and reserves;

• the issuance of additional units or the purchase, call, or redemption of outstanding units;

• transactions with CF Industries and its affiliates;

• the decision to retain separate counsel, accountants or others to perform services on our behalf;

• the decision by affiliates of the General Partner to engage in activities that would compete with us; and

• the fact that all executive officers of the General Partner, and the majority of the directors of the General Partner, also serve as executive officers of CF Industries. Such executive officers, including the General Partner's chief executive officer, chief financial officer and senior vice presidents, divide their time between our business and the business of CF Industries. These executive officers will face conflicts of interest from time to time in making decisions which may benefit either us or CF Industries.

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The agreement of limited partnership limits the liability and reduces the fiduciary duties of the General Partner and restricts the remedies available to us and our common unitholders for actions taken by the General Partner that might otherwise constitute breaches of fiduciary duty.

The agreement of limited partnership limits the liability and reduces the fiduciary duties of the General Partner and its directors and officers, while also restricting the remedies available to our common unitholders for actions that, without these limitations and reductions, might constitute breaches of fiduciary duty. For example:

• The agreement of limited partnership provides that none of the General Partner, any of its affiliates, or any director or officer of the General Partner or any of its affiliates will have any liability for monetary damages to us or our unitholders for any act or omission if such person acted in good faith.

• The agreement of limited partnership provides broad flexibility for the directors and officers of the General Partner to be involved in the management of the businesses of the owners of the General Partner, including any businesses that are in competition with our business, and specifically permits the owners of the General Partner to engage in activities that are competitive with our business. The agreement of limited partnership provides that no such activities will constitute a breach of any fiduciary duty owed by the General Partner.

• The agreement of limited partnership provides that in connection with its resolution of any conflict of interest by the General Partner, the General Partner may consider: the relative interests of any party involved in such conflict or affected by such action, agreement, transaction or situation and the benefits and burdens relating to such interest, as well as any additional factors as the General Partner determines in its sole discretion to be relevant, reasonable or appropriate under the circumstances. The agreement of limited partnership further provides that, in the absence of bad faith by the General Partner, the resolution provided by the General Partner with respect to any conflict of interest will not constitute a breach of the agreement of limited partnership or any standard of care or duty imposed in the agreement of limited partnership or under any law, rule or regulation.

By purchasing a common unit, a unitholder becomes bound by the provisions of the agreement of limited partnership, including the provisions described above.

CF Industries and its affiliates are also engaged in fertilizer manufacturing.

The agreement of limited partnership does not prohibit CF Industries and its affiliates, other than TNGP, from owning and operating nitrogen fertilizer manufacturing plants and storage and distribution assets or engaging in any businesses which could compete with our business. In addition, CF Industries has recently constructed certain assets related to our business and may in the future acquire, construct or dispose of additional assets related to our business, without any obligation to offer us the opportunity to purchase or construct any of these assets.

As a publicly-traded partnership we qualify for, and are relying on, certain exemptions from the corporate governance requirements of the New York Stock Exchange (NYSE).

As a publicly-traded partnership, we qualify for, and are relying on, certain exemptions from the NYSE's corporate governance requirements, including:

• the requirement that a majority of the TNGP Board of Directors consist of independent directors; and

• the requirement that the TNGP Board of Directors have a compensation committee that is composed entirely of independent directors.

Common units are subject to the General Partner's call right.

The General Partner and its affiliates own approximately 75.1% of our outstanding common units. When not more than 25% of the issued and outstanding common units are held by persons other than the General Partner and its affiliates (collectively, non-affiliated persons), we, at the General Partner's sole discretion, may call, or assign to the General Partner or its affiliates, our right to acquire all such outstanding common units held by non-affiliated persons. The purchase price per unit will be the greater of (i) the average of the previous 20 trading days' closing prices as of the date five days before the purchase is announced and (ii) the highest price paid by the General Partner or any of its affiliates for any common unit within the

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90 days preceding the date the purchase is announced. As a result of this right, unitholders may be required to sell their common units at an undesirable time or price and may not receive any return on their investment. Unitholders may also incur a tax liability upon a sale of their common units.

Limited partners of TNCLP may not have limited liability if a court finds that unitholder action constitutes control of our business.

• we were conducting business in a state but had not complied with that particular state's partnership statute; or

• Limited Partners' right to act with other unitholders to remove or replace the General Partner, to approve some amendments to our agreement of limited partnership or to take other actions under our agreement of limited partnership constituted "control" of our business.

Unitholders may have liability to repay distributions.

Likewise, upon the winding up of TNCLP, in the event that (a) we do not distribute assets in the following order: (i) to creditors in satisfaction of their liabilities; (ii) to partners and former partners in satisfaction of liabilities for distributions owed under the agreement of limited partnership; (iii) to partners for the return of their contribution; and (iv) to the partners in the proportions in which the partners share in distributions, and (b) a unitholder knows at the time of such circumstances, then such unitholder will be liable for a period of three years from the impermissible distribution to repay the distribution under Section 17-804 of the Delaware Act.

We may issue additional common units and other equity interests without unitholder approval, which would dilute unitholders' existing interests.

Under our agreement of limited partnership, we are authorized to issue an unlimited number of additional interests without a vote of the unitholders. The issuance by us of additional common units or other equity interests of equal or senior rank will have the following effects:

• the proportionate ownership interest of unitholders immediately prior to the issuance will decrease;

• the amount of cash distributions on each unit will decrease;

• the ratio of our taxable income to distributions may increase;

• the relative voting strength of each previously outstanding unit will be diminished; and

• the market price of the common units may decline.

TAX RISKS TO OUR COMMON UNITHOLDERS

TNCLP's tax treatment depends on its status as a partnership for U.S. federal income tax purposes, as well as it not being subject to a material amount of entity-level taxation by individual states. If the Internal Revenue Service were to treat TNCLP as a corporation for federal income tax purposes or if it were to become subject to a material amount of entity-level taxation for state tax purposes, then TNCLP's Available Cash would be substantially reduced.

15The anticipated after-tax economic benefit of an investment in our common units depends largely on TNCLP being treated as a partnership for federal income tax purposes. To maintain TNCLP's status as a partnership for federal income tax purposes, current law requires that 90% or more of our gross income for every taxable year consist of "qualifying income," as defined in Section 7704 of the Internal Revenue Code of 1986, as amended (the Code). We have not requested, and do not plan to request, a ruling from the Internal Revenue Service (the IRS) on this or any other matter affecting us.

If TNCLP were to be treated as a corporation in any taxable year, its income, gains, losses, deductions and credits would be reflected on its tax return rather than being passed through to unitholders, and its net income would be taxed at corporate rates. In addition, distributions made to unitholders would be treated as dividend income, to the extent of current and accumulated earnings and profits, and in the absence of earnings and profits, as a nontaxable return of capital (to the extent of a unitholder's basis in his units) or as capital gain (after a unitholder's basis in his units has been reduced to zero). If the IRS were to challenge the federal income tax status of TNCLP, it could result in an audit of a unitholder's entire tax return and in adjustments to items on that return which are unrelated to the ownership of our units. In addition, each unitholder would bear the cost of any expenses incurred in connection with an examination of its personal tax return.

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TERRA NITROGEN COMPANY, L.P.

~~The~~Agreement) ~~anticipated~~and ~~after-tax~~each ~~economic benefit~~ of anthe ~~investment~~target indistribution ~~our~~levels ~~common~~would ~~units~~be ~~depends~~adjusted ~~largely~~downward. onIn ~~TNCLP~~such ~~being~~an ~~treated~~event, asthe aMinimum ~~partnership~~Quarterly ~~for~~Distribution ~~federal~~and ~~income~~first, ~~tax~~second ~~purposes.~~and Tothird ~~maintain~~target ~~TNCLP's~~distributions ~~status~~for aseach aquarter ~~partnership~~thereafter ~~for~~would ~~federal~~be ~~income~~reduced ~~tax~~to ~~purposes,~~take ~~current~~into ~~law~~account ~~requires~~the ~~that~~federal, ~~90%~~state orand ~~more~~local oftaxes ~~our~~applicable ~~gross~~to ~~income~~TNCLP ~~for~~that ~~every~~would ~~taxable~~be ~~year~~imposed ~~consist~~on ofthe ~~"qualifying~~earnings ~~income,"~~used asto ~~defined~~make insuch ~~Section 7704~~distributions. ofFor ~~the~~additional ~~Internal~~information ~~Revenue~~regarding ~~Code~~cash ~~of 1986~~distributions, assee ~~amended (~~the "~~Code").~~Liquidity Weand ~~have~~Capital ~~not~~Resources" ~~requested,~~section ~~and~~of doItem 7. ~~not~~Management's ~~plan~~Discussion toand ~~request,~~Analysis aof ~~ruling~~Financial ~~from~~Condition ~~the~~and ~~Internal~~Results ~~Revenue~~of ~~Service~~Operations, ~~(the~~of ~~"IRS") on~~ this orAnnual ~~any~~Report ~~other~~on ~~matter affecting us~~Form 10-K.

There can be no assurance that TNCLP will continue to satisfy the requirements for treatment as a partnership for federal income tax purposes or that the law will not be changed to make TNCLP taxable as a corporation for federal income tax purposes. If such a new law were enacted, then the Minimum Quarterly Distribution (as defined in our agreement of limited partnership) and each of the target distribution levels would be adjusted downward. In such an event, the Minimum Quarterly Distribution and first, second and third target distributions for each quarter thereafter would be reduced to take into account the federal, state and local taxes applicable to TNCLP that would be imposed on the earnings used to make such distributions. For additional information regarding cash distributions, see the "Liquidity and Capital Resources" section of Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, of this Annual Report on Form 10-K.

If the IRS contests the federal income tax positions we take, the market for our units may be adversely impacted and the cost of any IRS contest will reduce our Available Cash.

We have not requested a ruling from the IRS with respect to TNCLP's treatment as a partnership for federal income tax purposes or any other matter. The IRS may adopt positions that differ from the positions we take. It may be necessary to resort to administrative or court proceedings to sustain some or all of the positions we take. A court may not agree with some or all of our positions. Any contest with the IRS could materially and adversely impact the market for our units and the price at which they trade. In addition, the costs of any contest with the IRS (for tax years beginning before December 31, 2017) will be borne indirectly by our unitholders because the costs would reduce our Available Cash.

16If the IRS makes audit adjustments to our income tax returns for tax years beginning after December 31, 2017, it may assess and collect any taxes (including any applicable penalties and interest) resulting from such audit adjustment directly from us, in which case our cash available for distribution to our unitholders might be substantially reduced.

Pursuant to the Bipartisan Budget Act of 2015, for tax years beginning after December 31, 2017, if the IRS makes audit adjustments to our income tax returns, it may assess and collect any taxes (including any applicable penalties and interest) resulting from such audit adjustment directly from us. Generally, we expect to elect to have our General Partner and our unitholders take such audit adjustment into account in accordance with their interests in the same manner as if the adjustment had originally been included into the allocable share of partnership profit or loss during the tax year under audit, but there can be no assurance that such election will be made or effective in all circumstances. If we are unable to have our General Partner and our unitholders take such audit adjustment into account in accordance with their interests in us during the tax year under audit, our current unitholders may bear some or all of the tax liability resulting from such audit adjustment, even if such unitholders did not own units in us during the tax year under audit. If, as a result of any such audit adjustment, we are required to make payments of taxes, penalties and interest, our cash available for distribution to our unitholders might be substantially reduced. These rules are not applicable to us for tax years beginning on or prior to December 31, 2017.

The tax treatment of publicly traded partnerships or an investment in our units could be subject to potential legislative, judicial or administrative changes and differing interpretations, possibly on a retroactive basis.

The present U.S. federal income tax treatment of publicly traded partnerships, including us, or an investment in our units, may be modified by administrative, legislative or judicial interpretation at any time. On January 19, 2017, the IRS issued final regulations on the types of income and activities that constitute or generate qualifying income of a MLP. For calendar year MLPs, the effective date of the regulations is January 1, 2018. The regulations have the effect of limiting the types of income and activities that qualify under the MLP rules, subject to certain transition provisions. The regulations define the activities that generate qualifying income from certain processing or refining and transportation activities with respect to any mineral or natural resource (including fertilizer) as activities that generate qualifying income, but the regulations reserve on specifics regarding fertilizer-related activities. However, the IRS has issued two private letter rulings to taxpayers in the fertilizer industry unrelated to TNCLP (one before and one after the issuance of the final regulations) which would indicate that each taxpayer's fertilizer manufacturing activities should produce qualifying income for purposes of determining whether 90% of the partnership's gross income is qualifying income under the final regulations. The entities to which these private letter rulings were issued would appear to operate nitrogen fertilizer manufacturing businesses that are similar to ours. While these private letter rulings provide some insight into the manner in which the IRS analyzed fertilizer manufacturing activities at the time these rulings were issued, these private letter rulings are specific to different entities. Thus, the IRS is not bound to follow them in respect of TNCLP, nor may we rely on them as precedent when determining whether we satisfy the MLP 90% gross income test. Any change in the federal income tax treatment of income from fertilizer-related activities as qualifying income could have a material impact on the taxation of the Partnership and could have a material adverse impact on unitholder distributions.

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TERRA NITROGEN COMPANY, L.P.

The tax treatment of publicly-traded partnerships or an investment in our units could be subject to potential legislative, judicial or administrative changes and differing interpretations, possibly on a retroactive basis.

The present U.S. federal income tax treatment of publicly-traded partnerships, including us, or an investment in our units, may be modified by administrative, legislative or judicial interpretation at any time. On January 19, 2017, the IRS issued final regulations on the types of income and activities that constitute or generate qualifying income of a MLP. For calendar year MLPs, the effective date of the regulations is January 1, 2018. The regulations have the effect of limiting the types of income and activities that qualify under the MLP rules, subject to certain transition provisions. The regulations define the activities that generate qualifying income from certain processing or refining and transportation activities with respect to any mineral or natural resource (including fertilizer) as activities that generate qualifying income, but the regulations reserve on specifics regarding fertilizer-related activities. However, the IRS has issued a private letter ruling to a taxpayer in the fertilizer industry unrelated to TNCLP which would indicate that each taxpayer's fertilizer manufacturing activities should produce qualifying income for purposes of determining whether 90% of the partnership's gross income is qualifying income. The entity to which this private letter ruling was issued would appear to operate a nitrogen fertilizer manufacturing business that is similar to ours. While this private letter ruling provides some insight into the manner in which the IRS analyzed fertilizer manufacturing activities at the time this ruling was issued, this private letter ruling is specific to a different entity. Thus, the IRS is not bound to follow it in respect of TNCLP, nor may we rely on it as precedent when determining whether we satisfy the MLP 90% gross income test. Any change in the federal income tax treatment of income from fertilizer-related activities as qualifying income could have a material impact on the taxation of the Partnership and could have a material adverse impact on unitholder distributions.

Our unitholders will be required to pay taxes on their share of TNCLP income even if they do not receive any cash distributions from us.

A unitholder is required to pay U.S. federal income tax and, in certain cases, state and local income taxes on its allocable share of TNCLP's income, whether or not such unitholder receives cash distributions from us. No assurance is given that our unitholders will receive cash distributions equal to their allocable share of taxable income from us.

We prorate our items of income, gain, loss and deduction between transferors and transferees of our units each month based upon the ownership of units as of the close of business on the last day of the preceding month, instead of on the basis of the date a particular unit is transferred.

We prorate our items of income and loss between transferors and transferees of our units each month based upon the ownership of our units as of the close of business on the last day of the preceding month instead of the date a particular unit is transferred. As a result of this monthly allocation, a unitholder transferring units may be allocated income, gain, loss, deduction and credit recognized after the transfer. The use of these proration methods may not be permitted under existing Treasury Regulations promulgated under the Code ("Treasury Regulations"). If the IRS were to challenge this method or new Treasury Regulations regarding allocation methods were issued, we may be required to change the allocation of items of income, gain, loss and deduction among our unitholders.

Tax gain or loss on disposition of our units could be more or less than expected.

If a unitholder sells its units, for income tax purposes, the unitholder will recognize a gain or loss equal to the difference between the amount realized and that unitholder's adjusted tax basis in those units. Because distributions in excess of a unitholder's allocable share of our net taxable income decrease that unitholder's tax basis in its units, the amount, if any, of such prior excess distributions with respect to the units sold will, in effect, become taxable income allocated to that unitholder if the unitholder sells such units at a price greater than that unitholder's tax basis in those units, even if the price received is less than the original cost. Furthermore, a portion of the amount realized, whether or not representing gain, may be taxed as ordinary income due to potential recapture items, including depreciation recapture. In addition, because the amount realized may include a unitholder's share of our nonrecourse liabilities, if a unitholder sells its units, such unitholder may incur a tax liability in excess of the amount of cash received from the sale.

Tax-exempt entities and non-U.S. persons face unique tax issues from owning our units that may result in adverse tax consequences to them.

Investment in our common units by tax-exempt entities, including employee benefit plans and individual retirement accounts (known as IRAs), and non-U.S. persons raises issues unique to them. For example, substantially all of our income allocated to organizations exempt from U.S. federal income tax, including IRA's, pension plans and other retirement plans and arrangements, will constitute unrelated business taxable income and may be taxable to such unitholders. Distributions to non-U.S. persons will be reduced by withholding taxes imposed at the highest applicable effective tax rate, and non-U.S. persons will be required to file U.S. federal income tax returns and pay tax on their share of our taxable income. Any tax-exempt entity or non-U.S. person should consult its tax advisor before investing in our units. Any tax-exempt entity or non-U.S. person who currently holds our units should consult with their tax advisor as to the U.S. federal and state tax consequences of their holding of our units, including the taxability of income and/or distributions to them.

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or non-U.S. person should consult its tax advisor before investing in our units. Any tax-exempt entity or non-U.S. person who currently holds our units should consult with their tax advisor as to the U.S. federal and state tax consequences of their holding of our units, including the taxability of income and/or distributions to them.

We treat each purchaser of our units as having the same tax benefits without regard to the actual units purchased. The IRS may challenge this treatment, which could adversely affect the value of our units.

Because we cannot match transferors and transferees of our units and to maintain the uniformity of the economic and tax characteristics of our common units, we have adopted depreciation and amortization positions that may not conform to all aspects of existing Treasury Regulations. A successful IRS challenge to these positions could adversely affect the amount of tax benefits available to a unitholder or the value of our common units.

The sale or exchange of 50% or more of our capital and profits interests during any twelve-month period will result in a termination of TNCLP for federal income tax purposes.

TNCLP and the Operating Partnership will be considered to have constructively terminated for federal income tax purposes if there is a sale or exchange of 50% or more of the total interests in TNCLP capital and profits within a 12-month period. For purposes of determining whether the 50% threshold has been met, multiple sales of the same interest are counted only once. Because CF Industries currently owns approximately 75.1% of the outstanding common units and all of the outstanding Class B common units of TNCLP, a sale or exchange of all or a substantial portion of CF Industries' interests in TNCLP (including sales or transfers to affiliates of CF Industries), when combined with trading in the open market, may constitute a sale or exchange of 50% or more of the total interest in TNCLP. A constructive termination would, among other things, result in the closing of TNCLP's taxable year for all unitholders and could result in a deferral of depreciation deductions allowable in computing our taxable income. In the case of a unitholder reporting on a taxable year other than a calendar year, the closing of a tax year of TNCLP may also result in more than twelve months of our taxable income or loss being included in such unitholder's taxable income for the year of termination. Termination could also subject us to penalties if we are unable to determine that a termination occurred and therefore failed to make necessary elections in a timely manner.

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TERRA NITROGEN COMPANY, L.P.

constitute a sale or exchange of 50% or more of the total interest in TNCLP. A constructive termination would, among other things, result in the closing of TNCLP's taxable year for all unitholders and could result in a deferral of depreciation deductions allowable in computing our taxable income. In the case of a unitholder reporting on a taxable year other than a calendar year, the closing of a tax year of TNCLP may also result in more than twelve months of our taxable income or loss being included in such unitholder's taxable income for the year of termination. Termination could also subject us to penalties if we are unable to determine that a termination occurred and therefore failed to make necessary elections in a timely manner. IRS Code Section 708(b)(1)(B) containing this technical termination rule was repealed by the Tax Cuts and Jobs Act of 2017 effective January 1, 2018.

A unitholder whose units are loaned to a "short seller" to cover a short sale may be considered as having disposed of those units. If so, the unitholder would no longer be treated for federal income tax purposes as a partner with respect to those units during the period of the loan and may recognize gain or loss from the disposition.

Because a unitholder whose units are loaned to a "short seller" to cover a short sale may be considered as having disposed of the loaned units, the unitholder may no longer be treated for federal income tax purposes as a partner with respect to those units during the period of the loan, and the unitholder may recognize gain or loss from such disposition. Moreover, during the period of the loan to the short seller, any of our income, gain, loss or deduction with respect to those units may not be reportable by the unitholder and any cash distributions received by the unitholder as to those units could be fully taxable as ordinary income. Unitholders desiring to assure their status as partners should modify any applicable brokerage account agreements to prohibit their brokers from borrowing their units.

As a result of investing in our units, a unitholder may become subject to state and local taxes and return filing requirements in jurisdictions where we operate or own or acquire property.

In addition to federal income taxes, our unitholders will likely be subject to other taxes, including state and local taxes, imposed by the various jurisdictions in which we conduct business or are otherwise deemed to be taxable now or in the future, even if our unitholders do not live in any of those jurisdictions. Our unitholders may be required to file state income tax returns and pay state income taxes in some or all of these various jurisdictions. Further, our unitholders may be subject to penalties for failure to comply with such requirements.

Income allocated to our common unitholders may be subject to the 3.8% Health Care Surtax.

Beginning in 2013, for federal income tax purposes, certain investment income earned by unitholders has become subject to an additional 3.8% surtax enacted as part of the Health Care and Education Reconciliation Act of 2010 (the "Health Care Surtax"). Unitholders will need to take into consideration the Health Care Surtax for estimated tax purposes, as well as in the filing of their income tax returns. Gross income from a passive activity, or a trade or business of trading in financial instruments or commodities can be subject to the Health Care Surtax. A "passive activity" is defined to be a trade or business in which the taxpayer does not "materially" participate. This category could include net business income from MLPs such as TNCLP. Investors in our common units are encouraged to consult their tax advisors as to the applicability of the Health Care Surtax to their particular tax situation.

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TERRA NITROGEN COMPANY, L.P.

K-1 Reporting Information is dependent upon proper reporting of purchases and sales by unitholders, their representatives and/or their brokers to TNCLP.

Under applicable federal law, we are permitted and do rely on brokerage firms, investor representatives and investors to report sales and dispositions of TNCLP units to us. This information forms the basis of our tax reporting to unitholders. If an investor (or their broker) fails to timely report a purchase or disposition of a unitholder’s interest in TNCLP, the investor will receive an inaccurate Form K-1. The failure to properly report a disposition of a unitholder’s interest does not mean that a unitholder is a continuing unitholder in TNCLP, rather it means that the investor, their representative or their broker have failed to meet its reporting obligations to us. We accept no responsibility for the failure of unitholders, their representatives or their brokers to comply with their reporting obligations to us.

IfThe ~~the~~Tax ~~IRS~~Cuts ~~makes~~and ~~audit~~Jobs ~~adjustments~~Act toof ~~our income tax returns for tax years beginning after December 31,~~ 2017, ~~it may assess and collect any taxes~~ (~~including~~Tax ~~any applicable penalties and interest~~Reform) ~~resulting~~will ~~from~~require ~~such~~us ~~audit~~to ~~adjustment~~make ~~directly~~determinations ~~from~~that ~~us,~~may innot ~~which~~benefit ~~case~~all ~~our~~unitholders ~~cash~~equally ~~available~~and ~~for~~could ~~distribution~~benefit tothe ~~our~~General ~~unitholders~~Partner ~~might~~and beits ~~substantially reduced~~affiliates.

~~Pursuant~~On toDecember ~~the Bipartisan Budget Act of 2015~~22, ~~for tax years beginning after December 31,~~ 2017, ifTax ~~the~~Reform ~~IRS~~was ~~makes~~signed ~~audit~~into ~~adjustments~~law. toTax ~~our~~Reform ~~income~~impacts ~~tax~~the ~~returns,~~taxation itof ~~may~~pass ~~assess~~through ~~and~~entities ~~collect~~such ~~any~~as ~~taxes~~TNCLP. ~~(including~~The ~~any~~majority ~~applicable~~of ~~penalties~~the ~~and~~provisions ~~interest)~~of ~~resulting~~Tax ~~from~~Reform ~~such~~are ~~audit~~effective ~~adjustment~~as ~~directly~~of ~~from~~January ~~us. Generally~~1, we2018. ~~expect~~Some toof ~~elect~~the toprovisions ~~have~~(like ~~our~~capital ~~General~~expensing) ~~Partner~~are elective and ~~our~~the ~~unitholders~~Tax ~~take~~Matters ~~such~~Partner ~~audit~~(which ~~adjustment~~is ~~into~~an ~~account~~affiliate inof ~~accordance~~the ~~with~~General ~~their~~Partner) ~~interests~~has ~~in us during~~ the ~~tax~~right ~~year~~to ~~under~~make ~~audit, but there can be no assurance that~~ such ~~election~~elections ~~will~~or bedeterminations ~~effective~~on inbehalf ~~all~~of ~~circumstances~~TNCLP. IfIn wemaking ~~are unable to have our General Partner and our unitholders take~~ such ~~audit~~an ~~adjustment~~election ~~into~~or ~~account~~determination inunder ~~accordance with their interests in us during~~ the tax ~~year~~law ~~under~~not ~~audit,~~all ~~our current~~ unitholders may ~~bear~~realize ~~some or all of~~ the same tax ~~liability~~benefit ~~resulting~~and ~~from~~in ~~such~~some ~~audit adjustment~~cases, ~~even~~an ifelection ~~such~~or ~~unitholders~~determination ~~did~~could ~~not~~benefit ~~own units in us during~~ the ~~tax~~General ~~year~~Partner ~~under audit. If, as a result of any such audit adjustment, we are required to make payments of taxes, penalties~~ and ~~interest,~~its ~~our cash available for distribution to our unitholders might be substantially reduced~~affiliates. ~~These rules are not applicable to us for tax years beginning on or prior to December 31, 2017.~~

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TERRA NITROGEN COMPANY, L.P.

FORWARD -LOOKING STATEMENTS

From time to time, in this Annual Report on Form 10-K as well as in other written reports and oral statements, we make forward-looking statements that are not statements of historical fact and may involve a number of risks and uncertainties. These statements relate to analyses and other information that are based on forecasts of future results and estimates of amounts not yet determinable. These statements may also relate to our prospects, future developments and business strategies. We have used the words "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "plan," "predict," "project," "will," or "would" and similar terms and phrases, including references to assumptions, to identify forward-looking statements in this document. These forward-looking statements are made based on currently available competitive, financial and economic data, our current expectations, estimates, forecasts and projections about the industries and markets in which we operate and management's beliefs and assumptions concerning future events affecting us. These statements are not guarantees of future performance and are subject to risks, uncertainties and factors relating to our operations and business environment, all of which are difficult to predict and many of which are beyond our control. Therefore, our actual results may differ materially from what is expressed in or implied by any forward-looking statements. We want to caution you not to place undue reliance on any forward-looking statements. We do not undertake any responsibility to release publicly any revisions to these forward-looking statements to take into account events or circumstances that occur after the date of this document. Additionally, we do not undertake any responsibility to provide updates regarding the occurrence of any unanticipated events which may cause actual results to differ from those expressed or implied by the forward- looking statements contained in this document.

Important factors that could cause actual results to differ materially from our expectations are disclosed under "Risk Factors" in Item 1A and elsewhere in this Annual Report on Form 10-K. Such factors include, among others:


•	risks related to our partnership structure and control of the General Partner by CF Industries;


•	changes in our available cash for distribution to our unitholders, due to, among other things, changes in our earnings, the amount of cash generated by our operations and the amount of cash reserves established by the General Partner for operating, capital and other requirements;


•	the conflicts of interest that may be faced by the executive officers of the General Partner, who operate both us and CF Industries;


•	risks related to our reliance on one production facility;


•	the cyclical nature of our business and the agricultural sector;


•	the global commodity nature of our fertilizer products, the impact of global supply and demand on our selling prices, and the intense global competition from other fertilizer producers;


•	conditions in the U.S. agricultural industry;


•	the volatility of natural gas prices in North America;


•	difficulties in securing the supply and delivery of raw materials, increases in their costs or delays or interruptions in their delivery;


•	reliance on third party providers of transportation services and equipment;


•	the significant risks and hazards involved in producing and handling our products against which we may not be fully insured;


•	risks associated with cyber security;


•	weather conditions;


•	potential liabilities and expenditures related to environmental, health and safety laws and regulations and permitting requirements;


•	future regulatory restrictions and requirements related to greenhouse gas emissions;


•	the seasonality of the fertilizer business;


•	risks involving derivatives and the effectiveness of our risk measurement and hedging activities;


•	limited access to capital;


•	acts of terrorism and regulations to combat terrorism;


•	risks related to our dependence on and relationships with CF Industries;

• deterioration of global market and economic conditions; and

• risks related to our partnership structure and control of the General Partner by CF Industries;

• changes in our available cash for distribution to our unitholders, due to, among other things, changes in our earnings, the amount of cash generated by our operations and the amount of cash reserves established by the General Partner for operating, capital and other requirements;

• the conflicts of interest that may be faced by the executive officers of the General Partner, who operate both us and CF Industries; and


•	tax risks to our common unitholders and changes in our treatment as a partnership for U.S. or state income tax purposes.

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TERRA NITROGEN COMPANY, L.P.

ITEM 1B. UNRESOLVED STAFF COMMENTS.

None.

ITEM 2. PROPERTIES.

Information regarding our Verdigris, Oklahoma facility ~~and properties~~ is included in ~~Part I,~~ Item 1. Business—Our Products and —Our Facilities.

ITEM 3. LEGAL PROCEEDINGS.

From time to time, we may be involved in claims, disputes, administrative proceedings and litigation arising in the ordinary course of business. Based on the information available as of the date of this filing, we do not believe that the matters in which the Partnership may be currently involved, either individually or in the aggregate, will have a material adverse effect on our business, financial condition, results of operations or cash flows.

ITEM 4. MINE SAFETY DISCLOSURES.

Not applicable.

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TERRA NITROGEN COMPANY, L.P.

Part II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES.

TNCLP's common units are traded on the New York Stock Exchange (NYSE) under the symbol "TNH". There is no public trading market with respect to TNCLP's Class B common units. The table below discloses the high and low sales prices of the common units for each quarterly period for ~~2016~~2017 and ~~2015~~2016, as reported on the NYSE Composite Price History.

2016

2015

2017

2016

Quarter

High

Low

High

Low

1st

~~114~~115.9986

8491.1207

~~158~~114.7099

9984.2212

2nd

~~127~~98.0029

9980.5550

~~149~~127.8800

~~115~~99.0555

3rd

~~122~~88.0057

~~104~~75.8820

~~125~~122.8300

98104.0088

4th

~~113~~89.3560

9576.9218

~~116~~113.35

~~100~~95.5092

Ownership of TNCLP is composed of the general partner ~~interests~~interest and the limited partner interests. The general partner interest in TNCLP is represented by 4,720 general partner units. The Limited Partners' interests consist of 18,501,576 common units and 184,072 Class B common units. CF Industries through its subsidiaries owned 13,889,014 common units and all of the Class B common units as of December 31, ~~2016~~2017. Based on information received from TNCLP's transfer and service agent, the number of registered unitholders as of February 1615, ~~2017~~2018 was 8681.

~~Under~~On ~~TNCLP's~~February ~~agreement~~7, ~~of limited partnership~~2018, ~~cash~~TNCLP ~~distributions~~announced tothat, ~~unitholders~~in ~~are~~accordance ~~based~~with onSection 17.1 ~~Available~~of ~~Cash for~~ the ~~quarter~~TNCLP asPartnership ~~defined~~Agreement, ~~therein.~~TNGP ~~Available~~elected ~~Cash~~to isexercise ~~defined~~the ~~generally~~right, asassigned ~~all~~to ~~cash~~TNGP ~~receipts~~by ~~less all cash disbursements~~TNCLP, ~~less~~to ~~certain~~purchase ~~reserves~~all ~~(including~~of ~~reserves~~the ~~for~~issued ~~future operating~~ and ~~capital~~outstanding ~~needs)~~common ~~established~~units asrepresenting ~~the~~limited ~~General~~partner ~~Partner~~interests ~~determines~~ in ~~its~~TNCLP ~~reasonable~~not ~~discretion~~already toowned beby ~~necessary~~TNGP or ~~appropriate.~~its ~~For~~affiliates ~~additional information regarding cash distributions, see~~ (the ~~"Liquidity~~Public ~~and Capital Resources" section of Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, of this Annual Report on Form 10-K~~Units).

~~The~~ TNGP ~~following~~will ~~table~~purchase ~~represents~~the ~~cash~~Public ~~distributions~~Units toon ~~the~~April 2, ~~holders~~2018 offor ~~common~~a ~~units,~~cash ~~Class B~~purchase ~~common~~price ~~units~~of ~~and~~$84.033 ~~the~~per ~~General~~Public ~~Partner~~Unit. ~~declared~~The ~~for~~purchase ~~the~~price ~~years~~was ~~ended~~determined ~~December~~in accordance with Section ~~31,~~17.1 ~~2016~~of ~~and~~the ~~2015:~~TNCLP Partnership Agreement.

		Common Units				Class BCommon Units				General Partner		Total Distributions Declared
		Total		Per unit		Total		Per unit		Total
		(in millions, except per unit amounts)
2016
	First Quarter	$	53.3	$	2.88	$	0.9	$	4.78	$	36.0	$	90.2
	Second Quarter	28.0		1.51		0.4		2.09		11.1		39.5
	Third Quarter	47.7		2.58		0.7		4.17		30.4		78.8
	Fourth Quarter	32.7		1.77		0.5		2.60		15.8		49.0
2015
	First Quarter	$	46.3	$	2.50	$	0.7	$	4.03	$	29.1	$	76.1
	Second Quarter	38.5		2.08		0.6		3.20		21.3		60.4
	Third Quarter	43.6		2.36		0.7		3.74		26.5		70.8
	Fourth Quarter	52.0		2.81		0.9		4.64		34.6		87.5

Under the TNCLP Partnership Agreement, cash distributions to unitholders are based on Available Cash for the quarter as defined therein. Available Cash is defined generally as all cash receipts less all cash disbursements, less certain reserves (including reserves for future operating and capital needs) established as the General Partner determines in its reasonable discretion to be necessary or appropriate. For additional information regarding cash distributions, see the "Liquidity and Capital Resources" section of Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, of this Annual Report on Form 10-K.

On February 7, 2018, we announced a cash distribution of $2.03 per common unit, payable on February 28, 2018 to holders of record as of February 16, 2018. As a result of TNGP’s exercise of the right to purchase the Public Units, there will be no further cash distributions on the common units after the distribution payable February 28, 2018.

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TERRA NITROGEN COMPANY, L.P.

~~ITEM~~The ~~6. SELECTED~~quarterly ~~FINANCIAL~~cash ~~DATA.~~distributions to the unitholders and the General Partner declared to date in 2018 and during 2017 and 2016 are as follows:

The following selected historical financial data as of December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014 have been derived from our audited consolidated financial statements and related notes included elsewhere in this document. The following selected historical financial data as of December 31, 2014, 2013 and 2012 and for the years ended December 31, 2013 and 2012 have been derived from our consolidated financial statements. The selected financial data should be read in conjunction with Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, and Item 8, Financial Statements and Supplementary Data, of this Annual Report on Form 10-K.



Distribution		Common Units				Class B Common Units				General Partner		Total Distributions Declared
Declared in	Related to	Total		Per unit		Total		Per unit		Total		Total Distributions Declared
		(in millions, except per unit amounts)

First Quarter 2018	Fourth Quarter 2017	$	37.6	$	2.03	$	0.6	$	3.10	$	20.4	$	58.6

First Quarter 2017	Fourth Quarter 2016	$	22.6	$	1.22	$	0.3	$	1.52	$	5.7	$	28.6
Second Quarter 2017	First Quarter 2017	17.9		0.97		0.2		1.04		1.4		19.5
Third Quarter 2017	Second Quarter 2017	29.6		1.60		0.4		2.26		12.7		42.7
Fourth Quarter 2017	Third Quarter 2017	25.2		1.36		0.3		1.79		8.3		33.8

First Quarter 2016	Fourth Quarter 2015	$	53.3	$	2.88	$	0.9	$	4.78	$	36.0	$	90.2
Second Quarter 2016	First Quarter 2016	28.0		1.51		0.4		2.09		11.1		39.5
Third Quarter 2016	Second Quarter 2016	47.7		2.58		0.7		4.17		30.4		78.8
Fourth Quarter 2016	Third Quarter 2016	32.7		1.77		0.5		2.60		15.8		49.0

	Year ended December 31,
	2016		2015		2014		2013		2012
	(in millions, except per unit data)
Income Statement Data:
Net sales	$	418.3	$	581.7	$	648.3	$	736.2	$	780.1
Gross margin	226.8		325.8		386.7		519.8		577.8
Net earnings	209.3		306.9		370.0		502.4		560.8
Net earnings per common unit	7.56		10.06		12.07		15.77		17.06
Partnership Distributions Paid:
Limited Partner, common units	$	161.7	$	180.4	$	185.1	$	265.6	$	312.1
Limited Partner, Class B common units	2.5		2.9		2.9		4.6		5.4
General Partner	93.3		111.5		116.1		195.0		240.8
Total partnership distributions	$	257.5	$	294.8	$	304.1	$	465.2	$	558.3
Distributions Paid Per Common Unit	$	8.74	$	9.75	$	10.00	$	14.35	$	16.86

	December 31,
	2016		2015		2014		2013		2012
	(in millions)
Balance Sheet Data:
Total assets	$	373.3	$	443.7	$	415.8	$	349.8	$	298.6
Total partners' capital	338.8		387.0		374.9		309.0		271.8

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TERRA NITROGEN COMPANY, L.P.

ITEM 6. SELECTED FINANCIAL DATA.

The following selected historical financial data as of December 31, 2017 and 2016 and for the years ended December 31, 2017, 2016 and 2015 have been derived from our audited consolidated financial statements and related notes included elsewhere in this document. The following selected historical financial data as of December 31, 2015, 2014 and 2013 and for the years ended December 31, 2014 and 2013 have been derived from our consolidated financial statements. The selected financial data should be read in conjunction with Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, and Item 8. Financial Statements and Supplementary Data, of this Annual Report on Form 10-K.



	Year ended December 31,
	2017		2016		2015		2014		2013
	(in millions, except per unit data)
Income Statement Data:
Net sales	$	397.2	$	418.3	$	581.7	$	648.3	$	736.2
Gross margin	156.7		226.8		325.8		386.7		519.8
Net earnings	153.9		209.3		306.9		370.0		502.4
Net earnings per common unit	5.93		7.56		10.06		12.07		15.77
Partnership Distributions Paid:
Limited Partner, common units	$	95.3	$	161.7	$	180.4	$	185.1	$	265.6
Limited Partner, Class B common units	1.2		2.5		2.9		2.9		4.6
General Partner interest	28.1		93.3		111.5		116.1		195.0
Total partnership distributions	$	124.6	$	257.5	$	294.8	$	304.1	$	465.2
Distributions Paid Per Common Unit	$	5.15	$	8.74	$	9.75	$	10.00	$	14.35



	December 31,
	2017		2016		2015		2014		2013
	(in millions)
Balance Sheet Data:
Total assets	$	403.9	$	373.3	$	443.7	$	415.8	$	349.8
Total partners' capital	368.1		338.8		387.0		374.9		309.0

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TERRA NITROGEN COMPANY, L.P.

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Recent Development—Exercise of Call Right

You should read the following discussion and analysis in conjunction with the consolidated financial statements and related notes included in Item 8. Financial Statements and Supplementary Data. Notes referenced in this discussion and analysis refer to the notes to consolidated financial statements that are found in Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements. Unless otherwise stated, our production and sales volume refer to product tons, which represents the weight of the product measured in short tons (one short ton is equal to 2,000 pounds). The following is an outline of the discussion and analysis included herein:


•	Company Overview;


•	Nitrogen Fertilizer Market Conditions;


•	Results of Operations;


•	Liquidity and Capital Resources;


•	Off-Balance Sheet Arrangements and Contractual Obligations;


•	Application of Critical Accounting Policies and Estimates; and


•	Recent Accounting Pronouncements.

Company Overview

We conduct our operations through an operating partnership, Terra Nitrogen, Limited Partnership (TNLP or the Operating Partnership, and collectively with TNCLP, the Partnership). We own a 99% limited partner interest in the Operating Partnership, and Terra LP Holdings LLC (TLPH), an affiliate of the General Partner, owns a 0.975% limited partner interest. Terra Nitrogen GP Inc. (TNGP or the General Partner), a Delaware corporation, is the general partner of both TNCLP and TNLP and owns a 0.025% general partner interest in each of TNCLP and TNLP. The General Partner is an indirect, wholly- owned subsidiary of CF Industries Holdings, Inc. (CF Industries), a Delaware corporation. Throughout this document, the term "affiliates of the General Partner" refers to consolidated subsidiaries of CF Industries, including TNGP. Ownership of TNCLP is composed of the general partner ~~interests~~interest and the limited partner interests. The general partner interest in TNCLP is represented by 4,720 general partner units. Limited partner interests are represented by common units, which are listed for trading on the New York Stock Exchange under the symbol "TNH", and Class B common units. As of December 31, ~~2016~~2017, we had 18,501,576 common units and 184,072 Class B common units issued and outstanding. CF Industries through its subsidiaries owned 13,889,014 common units (representing approximately 75.1% of the total outstanding common units) and all of the Class B common units as of December 31, ~~2016~~2017.

TNCLP and TNGP have no employees. Affiliates of the General Partner provides certain services to us under the Amendment to the General and Administrative Services and Product Offtake Agreement (the Services and Offtake Agreement). Pursuant to the Services and Offtake Agreement, the Partnership sells all of its fertilizer products to affiliates of the General Partner at prices based on market prices for the Partnership's fertilizer products as defined in the Services and Offtake Agreement. Title and risk of loss transfer to affiliates of the General Partner as the product is shipped from the plant gate. For further information regarding our agreements with CF Industries and the General Partner, see Notes to the Consolidated Financial Statements, Note 10—Related Party Transactions.25

Throughout this document, references to "affiliates of the General Partner" refer to the consolidated subsidiaries of CF Industries, including TNGP.

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TERRA NITROGEN COMPANY, L.P.

United States, Canada and the United Kingdom and distributes plant nutrients through a system of terminals, warehouses, and associated transportation equipment located primarily in the midwestern United States.

We are dependent on CF Industries for our success in a number of respects. TNCLP and TNGP have no employees. Pursuant to the Amendment to the General and Administrative Services and Product Offtake Agreement (the Services and Offtake Agreement), which is accounted for as an operating lease, the Partnership sells all of its nitrogen fertilizer products to affiliates of the General Partner at prices based on market prices for the Partnership's nitrogen fertilizer products. Also, pursuant to the Services and Offtake Agreement, selling prices are determined monthly and are equal to the volume weighted average net invoice price for third party sales (that is, sales by the affiliates of the General Partner to their customers) of product during each month. These selling prices are reduced by any freight or other transportation charges and incentives paid by the affiliates of the General Partner. Title and risk of loss transfer to affiliates of the General Partner as the product is shipped from the plant gate. Affiliates of the General Partner provide certain services to us under the Services and Offtake Agreement, including production planning, manufacturing management, logistics, procurement, accounting, legal, risk management, investor relations and other general and administrative services. For further information regarding our agreements with CF Industries and the General Partner, see Notes to the Consolidated Financial Statements, Note 10—Related Party Transactions.

Nitrogen Fertilizer Market Conditions

Our products are global commodities and are subject to price competition. The customers for our products make their purchasing decisions principally on the basis of delivered price and, to a lesser extent, on customer service and product quality. The selling prices of our products fluctuate in response to global market conditions and changes in supply and demand. In the current environment, global nitrogen fertilizer supply has increased faster than global nitrogen fertilizer demand, creating the current global oversupply of nitrogen fertilizer and leading to lower nitrogen fertilizer selling prices.

~~Our~~Historically, ~~2016~~global ~~results~~fertilizer ~~were~~demand ~~impacted~~has bybeen ~~excess~~driven ~~global~~primarily ~~nitrogen~~by ~~supply~~population ~~and~~growth, ~~the~~gross ~~resulting~~domestic ~~low~~product ~~nitrogen~~growth, ~~fertilizer~~changes ~~selling~~in ~~prices. The~~dietary ~~U.S.~~habits, ~~Gulf~~planted isacreage, aand ~~major~~application ~~global~~rates, ~~fertilizer~~among ~~pricing~~other ~~point~~things. ~~due~~We toexpect ~~the~~these ~~volume~~key ofvariables ~~nitrogen~~to ~~fertilizer~~continue ~~that~~to ~~trades~~have ~~there.~~major ~~Through~~impacts ~~most~~on oflong-term ~~2016,~~fertilizer ~~nitrogen~~demand ~~pricing~~for at the Uforeseeable future.S. ~~Gulf~~Short-term ~~declined,~~fertilizer ~~often~~demand ~~trading~~growth ~~below~~may ~~parity~~depend ~~with~~on ~~other~~global ~~international~~economic ~~pricing~~conditions, ~~points~~weather ~~due~~patterns, tothe ~~low~~level ~~U.S.~~of ~~import~~global ~~demand.~~grain ~~Seasonal~~stocks ~~decreases~~relative into ~~agricultural~~consumption, ~~demand~~governmental ~~combined~~regulations, ~~with~~including ~~delayed~~fertilizer ~~customer~~subsidies ~~purchasing~~or ~~activity~~requirements ~~resulted~~mandating inincreased ~~nitrogen~~use ~~fertilizer~~of ~~selling prices reaching multi~~bio-~~year~~fuels ~~lows~~or ~~last~~industrial ~~seen~~nitrogen inproducts, ~~2009~~and infarm ~~the~~sector ~~second~~income. ~~half~~Supply of ~~the~~fertilizers ~~year. Our~~is ~~average~~generally ~~selling~~driven ~~prices~~by ~~for~~available ~~ammonia~~capacity and ~~UAN~~operating ~~declined~~rates, byraw ~~32%~~material costs and ~~29%~~availability, ~~respectively~~government policies, asglobal ~~compared to 2015~~trade, ~~which~~ ~~reduced~~and ~~both~~supply ~~our~~costs ~~net~~for ~~sales~~raw ~~and~~materials ~~gross~~such ~~margin~~as innatural ~~2016~~gas byor ~~$178~~coal.5 ~~million. In~~The ~~addition,~~economics ~~during periods~~ of ~~declining~~nitrogen-based ~~prices,~~fertilizer ~~customers~~manufacturing ~~tend~~play toa ~~delay~~key ~~purchasing~~role ~~fertilizer~~ in ~~anticipation~~decisions ofto ~~prices~~increase inor ~~the~~reduce ~~future~~fertilizer ~~being~~production ~~lower than current prices~~capacity.

~~Customers~~Over ~~and~~the ~~farmers~~last ~~delayed purchasing through most of 2016 in response to lower selling prices~~decade, ~~which~~strong ~~reduced inventory levels in the supply chain. Increases in~~ demand, ~~for~~high ~~the~~capacity ~~2017~~utilization ~~spring~~and ~~application~~increasing ~~caused~~operating ~~higher~~margins ~~pricing~~ as ~~2016~~a ~~ended~~result ~~as customers began taking deliveries in anticipation~~ of ~~the~~higher ~~spring~~global ~~application~~nitrogen ~~season.~~fertilizer Aprices ~~significant~~stimulated ~~amount~~global ofinvestment ~~new~~in nitrogen production ~~capacity came on line in 2016~~facilities, ~~and~~which ~~additional~~resulted ~~production capacity is expected to come on line~~ in ~~2017,~~an ~~including a significant~~ increase in ~~capacity~~global ~~located~~nitrogen infertilizer ~~North~~production ~~America~~capacity. ~~This~~As ~~new~~a ~~capacity~~result, ~~will~~global ~~further increase supply. We expect~~ nitrogen fertilizer ~~prices~~supply toincreased ~~rise~~faster ~~going~~than ~~into~~global ~~the~~nitrogen ~~2017~~fertilizer ~~spring application season due to seasonal~~ demand~~. However~~, wecreating ~~expect~~ the ~~lower~~current ~~priced environment to continue until~~ global ~~supply~~oversupply ~~and~~in ~~demand~~the ~~become~~market, ~~more balanced through a combination of continued demand growth~~ and ~~supply~~leading ~~reductions as producers respond~~ to lower ~~realized~~nitrogen ~~margins~~fertilizer byselling ~~taking higher cost production facilities off line~~prices.

25A significant amount of new nitrogen production capacity came on line in 2016 and 2017, including an increase in production capacity located in North America. This new nitrogen production capacity includes the capacity expansion projects that were completed in 2016 by affiliates of our General Partner. The new nitrogen production capacity has further increased supply. We expect the lower priced environment to continue until global supply and demand become more balanced through a combination of continued demand growth and supply reductions as producers respond to lower realized margins by taking higher cost production facilities off line.

The significant price fluctuations we have experienced in 2017 are symptoms of a market in transition as new capacity comes fully on line and global trade flows adjust, and this transition is not complete. We expect another set of capacity additions to come fully on line by mid-2018. Should imports of nitrogen fertilizer products into the United States continue, and not fully take this additional capacity into account, we could see a decline in pricing or potentially experience lower prices than those we saw in the spring and summer of 2017. However, after this set of global capacity additions is on line, we expect global demand growth to exceed new capacity growth and set the stage for a more stable nitrogen price environment.

The greater global nitrogen supply availability and resulting low nitrogen fertilizer selling prices significantly impacted our results for the years ended December 31, 2017 and 2016. Our average selling prices for ammonia and UAN in 2017 declined by 20% and 12%, respectively, as compared to 2016, which reduced both our net sales and gross margin in 2017 by $68.3 million. Our average selling prices for ammonia and UAN in 2016 declined by 32% and 29%, respectively, as compared to 2015, which reduced both our net sales and gross margin in 2016 by $178.5 million.

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TERRA NITROGEN COMPANY, L.P.

Results of Operations

~~Consolidated~~We ~~Results~~reported net earnings of $153.9 million in 2017 on net sales of $397.2 million compared with 2016 net earnings of $209.3 million on net sales of $418.3 million. Net earnings per common unit in 2017 were $5.93 compared with $7.56 in 2016.

WeThe ~~reported~~following ~~net~~table ~~earnings~~shows ofour ~~$209.3~~results ~~million in 2016 on net sales~~ of ~~$418.3~~operations ~~million~~for ~~compared~~the ~~with~~years ~~2015~~ended ~~net earnings of $306.9~~December ~~million~~31, on2017, ~~net sales of $581.7 million. Net earnings per common unit in~~ 2016 ~~were~~and ~~$7.56 compared with $10.06 in~~ 2015.:

The following table shows the results of operations for the years ended December 31, 2016, 2015 and 2014:



	Year ended December 31,									2017 vs. 2016					2016 vs. 2015
	2017			2016			2015			Change			Percent		Change			Percent
	(in millions, except as noted)
Net sales	$	397.2		$	418.3		$	581.7		$	(21.1	)	(5	)%	$	(163.4	)	(28	)%
Cost of goods sold	240.5			191.5			255.9			49.0			26	%	(64.4		)	(25	)%
Gross margin	156.7			226.8			325.8			(70.1		)	(31	)%	(99.0		)	(30	)%
Gross margin percentage	39.5		%	54.2		%	56.0		%	(14.7		)%			(1.8		)%
Selling, general and administrative expenses	17.6			17.6			18.9			—			—	%	(1.3		)	(7	)%
Gain on sale of equity method investment	(14.3		)	—			—			(14.3		)	N/M		—			—	%
Earnings from operations	153.4			209.2			306.9			(55.8		)	(27	)%	(97.7		)	(32	)%
Interest income	0.5			0.1			—			0.4			N/M		0.1			N/M
Net earnings	$	153.9		$	209.3		$	306.9		$	(55.4	)	(26	)%	$	(97.6	)	(32	)%
Net earnings allocable to common units	$	109.8		$	139.9		$	186.2		$	(30.1	)	(22	)%	$	(46.3	)	(25	)%
Net earnings per common unit (dollars per common unit)	$	5.93		$	7.56		$	10.06		$	(1.63	)	(22	)%	$	(2.50	)	(25	)%
Sales volume (tons in thousands):
Ammonia	480			409			418			71			17	%	(9		)	(2	)%
UAN⁽¹⁾	1,909			1,759			1,668			150			9	%	91			5	%
Total	2,389			2,168			2,086			221			10	%	82			4	%
Average selling prices (dollars per ton):
Ammonia	$	258		$	323		$	477		$	(65	)	(20	)%	$	(154	)	(32	)%
UAN⁽¹⁾	$	142		$	162		$	227		$	(20	)	(12	)%	$	(65	)	(29	)%
Cost of natural gas (dollars per MMBtu):
Purchased natural gas costs⁽²⁾	$	2.71		$	2.32		$	2.49		$	0.39		17	%	$	(0.17	)	(7	)%
Realized derivatives loss⁽³⁾	0.07			0.40			0.26			(0.33		)	(83	)%	0.14			54	%
Cost of natural gas	$	2.78		$	2.72		$	2.75		$	0.06		2	%	$	(0.03	)	(1	)%
Production volume by product (tons in thousands):
Ammonia⁽⁴⁾	1,241			1,126			1,109			115			10	%	17			2	%
UAN⁽¹⁾	1,906			1,739			1,688			167			10	%	51			3	%

	Year ended December 31,									2016 vs. 2015					2015 vs. 2014
	2016			2015			2014			Change			Percent		Change			Percent
	(in millions, except as noted)
Net sales	$	418.3		$	581.7		$	648.3		$	(163.4	)	(28	)%	$	(66.6	)	(10	)%
Cost of goods sold	191.5			255.9			261.6			(64.4		)	(25	)%	(5.7		)	(2	)%
Gross margin	226.8			325.8			386.7			(99.0		)	(30	)%	(60.9		)	(16	)%
Gross margin percentage	54.2		%	56.0		%	59.6		%	(1.8		)%			(3.6		)%
Selling, general and administrative expenses	17.6			18.9			16.7			(1.3		)	(7	)%	2.2			13	%
Earnings from operations	209.2			306.9			370.0			(97.7		)	(32	)%	(63.1		)	(17	)%
Interest income	0.1			—			—			0.1			N/M		—			—	%
Net earnings	$	209.3		$	306.9		$	370.0		$	(97.6	)	(32	)%	$	(63.1	)	(17	)%
Net earnings allocable to common units	$	139.9		$	186.2		$	223.3		$	(46.3	)	(25	)%	$	(37.1	)	(17	)%
Net earnings per common unit	$	7.56		$	10.06		$	12.07		$	(2.50	)	(25	)%	$	(2.01	)	(17	)%
Sales volume (tons in thousands):
Ammonia	409			418			331			(9		)	(2	)%	87			26	%
UAN(1)	1,759			1,668			1,937			91			5	%	(269		)	(14	)%
Total	2,168			2,086			2,268			82			4	%	(182		)	(8	)%
Average selling prices (dollars per ton):
Ammonia	$	323		$	477		$	456		$	(154	)	(32	)%	$	21		5	%
UAN(1)	162			227			255			(65		)	(29	)%	(28		)	(11	)%
Cost of natural gas (dollars per MMBtu):
Purchased natural gas costs(2)	$	2.32		$	2.49		$	4.28		$	(0.17	)	(7	)%	$	(1.79	)	(42	)%
Realized derivatives loss (gain)(3)	0.40			0.26			(0.25		)	0.14			54	%	0.51			N/M
Natural gas costs (dollars per MMBtu)	$	2.72		$	2.75		$	4.03		$	(0.03	)	(1	)%	$	(1.28	)	(32	)%
Production volume by product (tons in thousands):
Ammonia(4)	1,126			1,109			1,147			17			2	%	(38		)	(3	)%
UAN(1)	1,739			1,688			1,942			51			3	%	(254		)	(13	)%

_______________________________________________________________________________

N/M— - Not Meaningful


⁽¹⁾	The nitrogen content of UAN is 32% by weight.

(2) ~~Includes~~Represents the cost of natural gas purchased during the period for use in production.

(3) ~~Includes~~Represents realized gains and losses on natural gas derivatives settled during the period. Excludes unrealized mark-to-market gains and losses on natural gas derivatives.


⁽⁴⁾	Gross ammonia production, including amounts subsequently upgraded on-site into UAN.

2627

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TERRA NITROGEN COMPANY, L.P.

Year ended December 31, 2017 Compared to Year ended December 31, 2016

In the first quarter of 2016, we experienced an unplanned outage for maintenance on one of the facility’s two ammonia plants, resulting in approximately one-half of the complex's ammonia capacity being shut down for approximately two months, and approximately one-half of the complex's UAN capacity being shut down for approximately one month. Maintenance was completed and the affected ammonia plant was restarted in March 2016. This turnaround reduced production in the year ended December 31, 2016.

Our net sales in 2017 were $397.2 million, a decrease of $21.1 million, or 5%, from net sales of $418.3 million in 2016. The decrease was due to a 14% decline in average selling prices in 2017 versus 2016, which reduced net sales by $68.3 million. Partially offsetting this decline was a 10% increase in sales volume in 2017 versus 2016, which increased net sales by $47.2 million.

UAN average selling prices declined by 12% from $162 per ton in 2016 to $142 per ton in 2017, which reduced net sales by $36.8 million, due to greater global nitrogen supply availability. UAN sales volume increased by 9% in 2017 to 1,909,000 tons from 1,759,000 tons in 2016, which increased net sales by $24.2 million, due to greater supply availability from increased production in 2017 compared to 2016 as a result of the unplanned outage in 2016.

Ammonia average selling prices declined by 20% from $323 per ton in 2016 to $258 per ton in 2017, which reduced net sales by $31.5 million, due to greater global nitrogen supply availability. Ammonia sales volume increased by 17% in 2017 to 480,000 tons from 409,000 tons in 2016, which increased net sales by $23.0 million, due to greater supply availability from increased production in 2017 compared to 2016 as a result of the unplanned outage in 2016 and an improved fall application season in 2017 compared to 2016.

The following table shows the components of cost of goods sold and the average cost of goods sold per ton for the years ended December 31, 2017 and 2016:



	Year ended December 31,
	2017		2016			2017 vs. 2016
	(in millions, except per ton amounts)
Realized natural gas costs	$	121.6	$	111.2		$	10.4		9	%
Unrealized mark-to-market loss (gain) on natural gas derivatives	10.6		(35.3		)	45.9			N/M
Payroll-related expenses	27.9		27.9			—			—	%
Other	80.4		87.7			(7.3		)	(8	)%
Total cost of goods sold	$	240.5	$	191.5		$	49.0		26	%
Average cost of goods sold per ton	$	101	$	88		$	13		15	%

_______________________________________________________________________________

N/M - Not Meaningful

The average cost of goods sold per ton increased to $101 per ton in 2017 from $88 per ton in 2016. The 15% increase in the average cost of goods sold per ton was due primarily to the change in value of our natural gas derivatives and the unrealized net mark-to-market changed to a loss of $10.6 million in 2017 from a gain of $35.3 million in 2016. Additionally, there was an increase in realized natural gas costs due to higher natural gas prices in 2017 as compared to 2016. These factors were partially offset by higher sales volume in 2017 and the non-recurrence of idle plant costs incurred as a result of the unplanned outage in 2016 as shown in the line titled Other in the table above.

Our gross margin was $156.7 million in 2017 compared to $226.8 million in 2016. Gross margin decreased 31% compared to the prior year due primarily to lower average selling prices, an unrealized net mark-to-market loss on natural gas derivatives in 2017 compared to a gain in the same period in 2016 and higher realized natural gas costs, partially offset by higher sales volume and the non-recurrence of idle plant costs incurred in 2016 as a result of the unplanned outage. Gross margin as a percentage of sales decreased to 39.5% in 2017 from 54.2% in 2016.

Our net earnings were $153.9 million in 2017, a decrease of $55.4 million, or 26%, as compared to $209.3 million in 2016. Net earnings decreased due to the lower gross margin discussed above, and were partially offset by a gain of $14.3 million related to the sale of our 50% interest in Oklahoma CO2 Partnership (OKCO2), a joint venture that owns a carbon dioxide liquefaction and purification facility, in the fourth quarter of 2017.

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TERRA NITROGEN COMPANY, L.P.

Year ended December 31, 2016 Compared to Year ended December 31, 2015

Our production and sales volume in 2016 was impacted by an ~~unscheduled~~unplanned outage, while in 2015 our production and sales volume was impacted by a scheduled turnaround. In the first quarter of 2016, we experienced an ~~unscheduled~~unplanned outage for maintenance on one of the Verdigris nitrogen complex’s two ammonia plants, resulting in approximately one-half of the complex's ammonia capacity being shut down for approximately two months, and approximately one-half of the complex's UAN capacity being shut down for approximately one month. Maintenance was completed and the affected ammonia plant was restarted in March 2016. In the first quarter of 2015, we commenced planned turnarounds of an ammonia plant and a UAN plant, together representing approximately one-half of the production capacity of the Verdigris nitrogen complex. The ammonia plant turnaround was completed in the first quarter of 2015 and the UAN plant turnaround, including certain follow-on maintenance, was completed in the second quarter of 2015. The net impact of these actions was marginally higher production in 2016, which contributed to higher sales volume for UAN.

Our net sales in 2016 were $418.3 million, a decrease of $163.4 million, or 28%, from net sales of $581.7 million in 2015. ~~due~~This ~~primarily~~decrease was due to ~~the~~a ~~decrease~~31% decline in average selling prices, ~~resulting~~which ~~from~~reduced ~~the~~net ~~global~~sales ~~fertilizer~~by ~~oversupply~~$178.5 ~~for~~million. ~~all~~Partially ~~nitrogen~~offsetting ~~fertilizer~~this ~~products,~~decline ~~partially~~was ~~offset~~a by4% ~~higher~~increase ~~UAN~~in sales volume in 2016 compared to 2015, which increased net sales by $15.1 million.

UAN average selling prices declined by 29% tofrom $~~162~~227 per ton in ~~2016~~2015 ~~from~~to $~~227~~162 per ton in ~~2015~~2016, which reduced net sales by $115.5 million, due to the global fertilizer oversupply for all nitrogen fertilizer products. UAN sales volume increased by 5% to 1,759,000 tons in 2016 from 1,668,000 tons in 2015, which increased net sales by $19.4 million, due to increased UAN production.

Ammonia average selling prices declined by 32% tofrom $~~323~~477 per ton in ~~2016~~2015 ~~from~~to $~~477~~323 per ton in ~~2015~~2016, which reduced net sales by $63.0 million. The decrease in ammonia ~~average~~ selling prices was due to the global fertilizer oversupply for all nitrogen fertilizer products. Ammonia sales volume ~~decreased~~declined by 2% in 2016 to 409,000 ~~tons~~ from 418,000 tons in 2015, aswhich reduced net sales by $4.3 million. The decrease in ammonia sales volume was a result of unfavorable weather and economic considerations, including declining year-over-year farmer disposable income and futures prices favoring soybeans over corn, which led many farmers to delay fertilizer and planting decisions until spring 2017.

The following table shows the components of cost of goods sold and the average cost of goods sold per ton for the years ended December 31, 2016 and 2015:

	Year ended December 31,
	2016			2015		2016 vs. 2015
	(in millions, except per ton amounts)
Realized natural gas costs	$	111.2		$	108.8	$	2.4		2	%
Unrealized net mark-to-market (gain) loss on natural gas derivatives	(35.3		)	23.1		(58.4		)	N/M
Unrealized mark-to-market (gain) loss on natural gas derivatives	(35.3		)	23.1		(58.4		)	N/M
Payroll-related expenses	27.9			27.9		—			—	%
Other	87.7			96.1		(8.4		)	(9	)%
Total cost of goods sold	$	191.5		$	255.9	$	(64.4	)	(25	)%
Average cost of goods sold per ton	$	88		$	123	$	(35	)	(28	)%

_______________________________________________________________________________

N/M - Not Meaningful

The average cost of goods sold per ton decreased to $88 per ton in 2016 from $123 per ton in 2015. The 28% decrease in the average cost of goods sold per ton was due primarily to an unrealized net mark-to-market gain on natural gas derivatives of $35.3 million in 2016 compared to an unrealized net mark-to-market loss on natural gas derivatives of $23.1 million in 2015, as well as lower idle plant costs, which are shown in the Other line in the table above, due to the turnarounds that occurred in the first half of 2015.

Our gross margin was $226.8 million in 2016 compared to $325.8 million in 2015. Gross margin decreased 30% compared to the prior year due primarily to lower average selling prices partially offset by an unrealized net mark-to-market gain on natural gas derivatives and, to a lesser extent, higher UAN sales volume in 2016 compared to 2015. Gross margin as a percentage of sales decreased to 54.2% in 2016 from 56.0% in 2015.

Total selling, general, and administrative expenses, including other general and administrative expenses, were $17.6 million in 2016 compared to $18.9 million in 2015. The decline was due primarily to lower losses on the disposal of property, plant, and equipment during 2016 compared to 2015.

Our net earnings were $209.3 million in 2016, a decrease of $97.6 million, or 32%, as compared to $306.9 million in 2015. Net earnings decreased due primarily to our lower gross margin driven by lower average selling prices, as discussed above.29

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TERRA NITROGEN COMPANY, L.P.

~~Year~~Our ~~ended~~net ~~December 31~~earnings were $209.3 million in 2016, a decrease of $97.6 million, or 32%, as compared to $306.9 million in 2015. ~~Compared~~Net earnings decreased due to ~~Year~~the ~~ended~~lower ~~December 31~~gross margin, ~~2014~~as discussed above.

In the first quarter of 2015, we commenced planned turnarounds of an ammonia plant and a UAN plant, together representing approximately one-half of the production capacity of the Verdigris nitrogen complex. The ammonia plant turnaround was completed in the first quarter of 2015 and the UAN plant turnaround, including certain follow-on maintenance, was completed in the second quarter of 2015. These turnarounds reduced production in the year ended December 31, 2015 as compared to production in the year ended December 31, 2014.

Our net sales in 2015 were $581.7 million, a decrease of $66.6 million, or 10%, from net sales of $648.3 million in 2014 due primarily to the decrease in UAN average selling prices and decrease in UAN sales volume attributable to lower production as a result of the turnarounds, partially offset by higher ammonia sales volume and ammonia average selling prices.

UAN average selling prices declined 11% to $227 per ton in 2015 from $255 per ton in 2014. The decline in UAN average selling prices was due to excess global supply weighing on global nitrogen fertilizer selling prices and increased UAN imports into the North American market. UAN volume decreased by 14% to 1,668,000 tons in 2015 from 1,937,000 tons in 2014 due to the impact of the UAN plant turnaround in the first half of 2015.

Ammonia sales volume increased 26% in 2015 to 418,000 tons from 331,000 tons in 2014 as a result of the impact of the turnaround of the UAN plant which increased the amount of ammonia available for sale. Additionally, an early spring application window, together with customer preferences for ammonia contributed to the increase. Ammonia selling prices increased 5% to $477 per ton in 2015 from $456 per ton in 2014. The increase in ammonia selling prices was due to a tighter U.S. producer inventory position as we entered 2015.

The following table shows the components of cost of goods sold and the average cost of goods sold per ton for the years ended December 31, 2015 and 2014:

	Year ended December 31,
	2015		2014		2015 vs. 2014
	(in millions, except per ton amounts)
Realized natural gas costs	$	108.8	$	164.7	$	(55.9	)	(34	)%
Unrealized net mark-to-market loss (gain) on natural gas derivatives	23.1		12.6		10.5			83	%
Payroll-related expenses	27.9		24.0		3.9			16	%
Other	96.1		60.3		35.8			59	%
Total cost of goods sold	$	255.9	$	261.6	$	(5.7	)	(2	)%
Average cost of goods sold per ton	$	123	$	115	$	8		7	%

The average cost of goods sold per ton increased to $123 per ton in 2015 from $115 per ton in 2014. The 7% increase was due primarily to lower production levels due to plant turnarounds, the impact of higher payroll-related expenses for employees working on turnaround activities and certain items in the other category in the table above, such as higher maintenance costs and higher depreciation as a result of the turnarounds in the first half of 2015. These items were partially offset by lower natural gas costs. Overall, cost of goods sold decreased by 2% from 2014 to $255.9 million in 2015 due primarily to lower UAN sales volume and lower natural gas costs. Realized natural gas costs decreased 32%, from $4.03 per MMBtu in 2014 to $2.75 per MMBtu in 2015. Additionally, we recorded a $23.1 million unrealized net mark-to-market loss on natural gas derivatives in 2015, compared to a $12.6 million unrealized net mark-to-market loss in 2014.

Our gross margin was $325.8 million in 2015 compared to $386.7 million in 2014. Gross margin decreased 16% compared to the prior year due primarily to lower UAN average selling prices as a result of excess global supply and increased UAN imports into the North American market and lower UAN sales volume as a result of reduced production due to the turnaround activities. In addition, gross margin was also impacted by higher average cost of goods sold per ton as a result of the increase in unrealized mark-to-market loss on natural gas derivatives in the year ended December 31, 2015 in comparison to prior year period and higher maintenance costs and higher depreciation costs as a result of the turnaround activities in 2015. Gross margin as a percentage of sales decreased to 56.0% in 2015 from 59.6% in 2014.

Selling, general and administrative expenses were $18.9 million in 2015 compared to $16.7 million in 2014 due primarily to a loss on disposal of certain machinery and equipment during 2015.

Our net earnings were $306.9 million in 2015, a decrease of $63.1 million, or 17%, as compared to $370.0 million in 2014. Net earnings decreased due primarily to the lower gross margin.

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TERRA NITROGEN COMPANY, L.P.

Liquidity and Capital Resources

~~Summary~~Our principal funding needs and uses of cash are working capital, plant turnaround costs, capital expenditures, and quarterly distributions. Our cash and cash equivalents balance as of December 31, 2017 was $81.5 million, an increase of $42.0 million from the balance of $39.5 million as of December 31, 2016. Our cash and cash equivalents consist primarily of money market mutual funds that invest in U.S. treasuries and direct investments in U.S. treasuries with original maturities of three months or less.

Our principal funding needs and uses of cash are working capital, plant turnaround costs, capital expenditures, and quarterly distributions. Our cash and cash equivalents balance as of December 31, 2016 was $39.5 million, a decrease of $66.9 million from the balance of $106.4 million as of December 31, 2015. Our cash and cash equivalents consist primarily of money market mutual funds that invest in U.S. treasuries and direct investments in U.S. treasuries.

Because we sell our product to, and receive payroll and other related services from, affiliates of the General Partner, the affiliates of the General Partner continue to be both debtors and creditors to us.

Cash Flows

The following table summarizes our cash flows from operating, investing and financing activities for each of the past three fiscal years:

	Year Ended December 31,
	2016			2015			2014
	2017			2016			2015
	(in millions)
Total cash provided by (used in):
Operating activities	$	~~223~~177.5		$	~~375~~223.15		$	~~405~~375.31
Investing activities	(3210.9		)	(8632.9		)	(6786.19		)
Financing activities	(~~257~~124.56		)	(~~294~~257.85		)	(~~312~~294.18		)
(Decrease) increase in cash and cash equivalents	$	(66.9	)	$	(6.6	)	$	26.1
Increase (decrease) in cash and cash equivalents	$	42.0		$	(66.9	)	$	(6.6	)

Operating Activities

Net cash provided by operating activities was $~~223~~177.5 million in ~~2016~~2017 compared to $~~375~~223.15 million in ~~2015~~2016 and $~~405~~375.31 million in ~~2014~~2015. The $~~151~~46.60 million decline in ~~2016~~2017 and the $30151.26 million decline in ~~2015~~2016 were due primarily to ~~decreases~~lower inprofitability ~~net~~as ~~earnings~~a ~~after~~result ~~considering~~of ~~the~~greater ~~non-cash~~global ~~depreciation~~nitrogen ~~and~~supply ~~unrealized~~availability. ~~net~~Also ~~mark-~~contributing to~~-market~~ ~~gains~~the ~~and~~decline ~~losses~~in on2017 ~~derivatives.~~compared ~~Net~~to ~~earnings~~2016 ~~included~~was ~~depreciation~~a ~~and~~higher ~~amortization~~amount ~~expense~~ of ~~$40.4 million~~cash invested in working capital, ~~$35.8 million~~primarily ~~and~~as ~~$23.5 million~~a inresult ~~2016,~~of ~~2015~~an ~~and~~increase ~~2014,~~in ~~respectively,~~the ~~and~~receivables ~~unrealized~~due ~~net~~from ~~mark-to-market~~affiliates ~~(gain)~~of ~~loss~~our onGeneral ~~derivatives~~Partner as a result of ~~$(35.3) million,~~higher ~~$24.3 million~~selling ~~and~~prices ~~$11.4 million~~at inthe ~~2016,~~end ~~2015~~of ~~and~~2017 ~~2014,~~compared ~~respectively~~to 2016.

Investing Activities

Net cash used in investing activities was $3210.9 million in ~~2016~~2017 compared to $8632.9 million in ~~2015~~2016 and $6786.19 million in ~~2014~~2015. The $5422.0 million decrease in ~~2016~~2017 in cash used in investing activities from ~~2015~~2016 was due to ~~higher~~lower capital expenditures in ~~2015~~2017 due to ~~planned~~the ~~plant~~unplanned ~~turnaround~~outage ~~activities~~for maintenance in the first quarter of 2016 as well as proceeds of $16.3 million from the sale of our 50% joint venture interest in OKCO2. Cash used in investing activities ~~increased~~decreased by $1954.80 million in ~~2015~~2016 from ~~2014~~2015 due ~~primarily~~ to ~~the~~higher capital expenditures in 2015 due to planned plant turnaround activities in 2015. Additions to property, plant and equipment were $3327.12 million, $8733.81 million and $6787.18 million in ~~2016~~2017, ~~2015~~2016 and ~~2014~~2015, respectively. See further discussion under "Capital Expenditures."

Financing Activities

Net cash used in financing activities was $~~257~~124.56 million in ~~2016~~2017 compared to $~~294~~257.85 million in ~~2015~~2016 and $~~312~~294.18 million in ~~2014~~2015, and consists of distributions paid to our unitholders. The $37132.39 million decrease in ~~cash~~distributions ~~used~~paid into ~~financing~~our ~~activities~~unitholders in ~~2016~~2017 compared to ~~2015~~2016, and the $1737.3 million decrease in ~~cash~~distributions ~~used~~paid into ~~financing~~our ~~activities~~unitholders in ~~2015~~2016 compared to ~~2014~~2015, were both ~~due~~ primarily todriven ~~changes~~by inlower ~~distributions~~net ~~paid to unitholders~~earnings. ~~Distributions paid to our unitholders were $257.5 million, $294.8 million and $304.1 million in 2016, 2015 and 2014, respectively.~~ The distributions are paid based on Available Cash, as defined in ~~our~~the ~~agreement~~TNCLP ofPartnership ~~limited partnership~~Agreement. ~~Cash used to fund capital expenditures is a reduction of Available Cash. See further discussion under "Capital Expenditures" regarding capital expenditure programs for 2017.~~ For additional information on distributions, see "Partnership Distributions" and ~~Notes to the Consolidated Financial Statements,~~ Note 4—Agreement of Limited Partnership.

2930

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TERRA NITROGEN COMPANY, L.P.

Capital Expenditures

Capital expenditures totaled $3327.12 million in ~~2016~~2017 compared to $8733.81 million in ~~2015 with the decrease due primarily to higher capital expenditures in 2015 due to planned plant turnaround activities~~2016. Capital expenditures are made to sustain our asset base, to increase capacity, to improve plant efficiency and to comply with various environmental, health and safety requirements. Due to the size, scope and timing of capital projects, certain projects require more than a year to complete.

In ~~2017~~2018, we expect to make capital expenditures in the range of $7565 million to $8575 million. ~~Approximately~~Planned one-half of the projected capital expenditures relate to a plant turnaround expected to occur beginning late in the third quarter and continuing into the fourth quarter of 2017. The planned plant turnaround will result in lower ammonia and UAN production, lower sales and lower profitability during the period of the turnaround, which will reduce Available Cash for distributions to unitholders. Additionally, planned maintenance, capital expenditures, and turnarounds are subject to change due to delays in regulatory approvals and/or permitting, unanticipated increases in cost, changes in scope and completion time, performance of third parties, delay in the receipt of equipment, adverse weather, defects in materials and workmanship, labor or material shortages, transportation constraints, and other unforeseen difficulties. ~~Capital~~We ~~expenditures~~anticipate ~~also~~a ~~reduce~~planned ~~the~~turnaround ~~Available~~of ~~Cash~~one-half ~~for~~of ~~unitholder~~our ~~distributions.~~Verdigris ~~The~~nitrogen ~~plant~~complex ~~turnaround~~will ~~expected~~occur ~~to begin~~ in the third quarter of ~~2017~~2018 isand ~~estimated~~will to cost approximately $4038 million,. ~~and~~We ~~the~~had ~~calculation~~previously ofestimated ~~Available~~that ~~Cash~~this ~~for~~turnaround would occur in late 2017 or early 2018, but the ~~fourth~~turnaround ~~quarter~~was ofdelayed ~~2016~~due ~~included~~to a ~~reserve~~delay ofin ~~approximately~~receiving ~~one-third~~certain critical equipment. The turnaround will result in lower ammonia and UAN production, lower sales and lower profitability during the period of ~~that~~the ~~amount~~turnaround.

General Partner

The General Partner is an indirect, wholly- owned subsidiary of CF Industries. Under the General Partner’s governing documents, neither we nor the General Partner may make any bankruptcy filing (or take similar action) without the approval of at least two of the General Partner’s independent directors, except in specified circumstances if there are not two independent directors on the General Partner's Board of Directors (the TNGP Board of Directors).

Partnership Distributions

We make quarterly distributions to holders of our general partner interest and limited partner interests based on Available Cash for the quarter as defined in ~~our~~the ~~agreement~~TNCLP ofPartnership ~~limited partnership~~Agreement. Available Cash is defined generally as all cash receipts less all cash disbursements, less certain reserves (including reserves for future operating and capital needs) established as the General Partner determines in its reasonable discretion to be necessary or appropriate. Changes in working capital affect Available Cash, as ~~changes~~increases in the amount of cash invested in working capital items (such as increases in receivables or inventory and decreases in accounts payable) reduce Available Cash, while declines in the amount of cash invested in working capital items increase Available Cash. WeDuring the years ended December 31, 2017, 2016 and 2015, we declared and paid partnership distributions of $~~257~~124.56 million, $~~294~~257.85 million and $~~304~~294.18 million ~~to our unitholders in 2016~~, ~~2015 and 2014,~~ respectively.

We receive 99% of the Operating Partnership's Available Cash (as defined in the Operating Partnership's agreement of limited partnership) and 1% of the Operating Partnership's Available Cash is distributed by the Operating Partnership to the General Partner and its ~~affiliates. Pursuant to our agreement of limited partnership~~affiliate, ~~distributions of our Available Cash are made 99~~TLPH.~~975%~~ toDistributions ~~common~~recognized ~~and~~by ~~Class B~~the ~~common~~Operating ~~unitholders~~Partnership ~~and~~with ~~0.025%~~respect to the General Partner ~~except~~and ~~that~~TLPH ~~the~~were ~~General~~$1.2 ~~Partner is entitled~~million, as$2.6 anmillion ~~incentive,~~and to a larger percentage of our distribution of Available Cash to the extent that cumulative distributions of Available Cash exceed specified target levels above the Minimum Quarterly Distributions (MQD) of $02.~~605~~9 ~~per~~million ~~unit.~~for ~~The~~the ~~General~~years ~~Partner~~ended ~~has~~December 31, ~~assigned~~2017, ~~its~~2016 ~~right~~and to2015, ~~receive such incentive distributions to an affiliate of the General Partner~~respectively.

OnPursuant ~~February 6,~~to ~~2017~~the TNCLP Partnership Agreement, wedistributions ~~announced~~of aour $1Available Cash are made 99.22975% ~~cash~~to ~~distribution~~common ~~per~~and Class B common ~~unit,~~unitholders ~~payable~~and on0.025% ~~February 28~~to the General Partner except that the General Partner is entitled, ~~2017~~as an incentive, to ~~holders~~a larger percentage of ~~record~~our asdistribution of ~~February 17,~~Available ~~2017.~~Cash Into the ~~fourth~~extent ~~quarter~~that cumulative distributions of ~~2016,~~Available weCash ~~exceeded~~exceed specified target levels above the ~~cumulative~~Minimum Quarterly Distributions (MQD) ~~amounts~~of ~~and~~$0.605 ~~will~~per ~~distribute~~unit. ~~Available~~The ~~Cash~~General asPartner ~~summarized~~has inassigned its right to receive such incentive distributions to an affiliate of the ~~following~~General ~~table:~~Partner.

	Income and Distribution Allocation
	TargetLimit		TargetIncrement		CommonUnits		Class BCommonUnits		GeneralPartner (1)		Total
Minimum Quarterly Distributions	$	0.605	$	0.605	98.990	%	0.985	%	0.025	%	100.00	%
First Target	0.715		0.110		98.990	%	0.985	%	0.025	%	100.00	%
Second Target	0.825		0.110		85.859	%	0.985	%	13.156	%	100.00	%
Third Target	1.045		0.220		75.758	%	0.985	%	23.257	%	100.00	%
Final Target and Beyond	>1.045		—		50.505	%	0.985	%	48.510	%	100.00	%

~~_______________________________________________________________________________~~31

(1) Reflects Minimum Quarterly Distributions and incentive distributions to the General Partner. The General Partner has assigned its right to incentive distributions to an affiliate of the General Partner.

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TERRA NITROGEN COMPANY, L.P.

In the fourth quarter of 2017, we exceeded the cumulative MQD amounts and will distribute Available Cash as summarized in the following table:



	Quarterly Income and Distribution Allocation
	Target Limit (per unit)		Target Increment (per unit)		Distribution Threshold (in millions) ⁽¹⁾		Common Units		Class B Common Units		General Partner ⁽²⁾		Total
Minimum Quarterly Distributions	$	0.605	$	0.605	$	11.3	98.990	%	0.985	%	0.025	%	100	%
First Target	0.715		0.110		13.4		98.990	%	0.985	%	0.025	%	100	%
Second Target	0.825		0.110		15.4		85.859	%	0.985	%	13.156	%	100	%
Third Target	1.045		0.220		19.5		75.758	%	0.985	%	23.257	%	100	%
Final Target and Beyond	>1.045		—		> 19.5		50.505	%	0.985	%	48.510	%	100	%

_______________________________________________________________________________


⁽¹⁾	The Distribution Threshold represents the cumulative amount of Available Cash necessary to distribute the Target Limit per unit, as shown in the table above, to all unitholders and the General Partner based on the number of units outstanding as of December 31, 2017.


⁽²⁾	Reflects Minimum Quarterly Distributions and incentive distributions to the General Partner. The General Partner has assigned its right to incentive distributions to an affiliate of the General Partner.

General Partner Option to Effect Mandatory Redemption of Partnership Units

At December 31, ~~2016~~2017, the General Partner and its affiliates owned approximately 75.1% of our outstanding common units. When not more than 25% of the issued and outstanding common units are held by persons other than the General Partner and its affiliates (collectively, non-affiliated persons), as was the case at December 31, ~~2016~~2017, we, at the General Partner's sole discretion, may call or assign to the General Partner or its affiliates, our right to acquire all, but not less than all, such outstanding common units held by non-affiliated persons. If the General Partner elects to acquire all outstanding common units, we are required to give at least 30 but not more than 60 days' notice of our decision to purchase the outstanding common units. The purchase price per unit will be the greater of (1) the average of the previous 20 trading days' closing prices as of the date five days before the purchase is announced or (2) the highest price paid by the General Partner or any of its affiliates for any unit within the 90 days preceding the date the purchase is announced.

TNGP will purchase the Public Units on April 2, 2018 for a cash purchase price of $84.033 per Public Unit. The purchase price was determined in accordance with Section 17.1 of the TNCLP Partnership Agreement as the average of the daily closing prices per common unit for the 20 consecutive trading days beginning with January 5, 2018 and ending with February 2, 2018.

Cash Transactions with Affiliates

Derivatives

We purchase natural gas at market prices to meet production requirements at our manufacturing facility. Natural gas prices are volatile, and ~~our~~CF Industries' natural gas acquisition policy allows us to establish derivative positions that are associated with anticipated natural gas requirements. The derivatives that we use are primarily natural gas fixed price swaps and options traded in the over-the-counter markets.

Derivative financial instruments are executed on our behalf by an affiliate of the General Partner to reduce our exposure to changes in commodity prices for natural gas. Natural gas derivatives involve the risk of dealing with counterparties and their ability to meet the terms of the contracts. The counterparties to our natural gas derivatives are ~~multi-national~~multinational commercial banks, other major financial institutions and large energy companies. For derivatives that are in net asset positions, we are exposed to credit loss from nonperformance by the counterparties. Credit risk is controlled through the use of multiple counterparties, credit limits, credit monitoring procedures, cash collateral requirements and master netting arrangements.

~~Internal Revenue Service Regulation Impacting Master Limited Partnerships~~32

We are a master limited partnership (MLP). Partnerships are generally not subject to federal income tax, although publicly-traded partnerships (such as TNCLP) are treated as corporations for federal income tax purposes and therefore are subject to federal income tax, unless at least 90% of the partnership's gross income is "qualifying income" as defined in Section 7704 of the Internal Revenue Code of 1986, as amended, and the partnership is not required to register as an investment company under the Investment Company Act of 1940. As we currently satisfy the requirements to be treated as a partnership for federal income tax purposes, no federal income taxes are paid by the Partnership.

On January 19, 2017, the Internal Revenue Service (IRS) issued final regulations on the types of income and activities that constitute or generate qualifying income of a MLP. For calendar year MLPs, the effective date of the regulations is January 1, 2018. The regulations have the effect of limiting the types of income and activities that qualify under the MLP rules, subject to certain transition provisions. The regulations define the activities that generate qualifying income from certain processing or refining and transportation activities with respect to any mineral or natural resource (including fertilizer) as activities that generate qualifying income, but the regulations reserve on specifics regarding fertilizer-related activities. However, the IRS has issued a private letter ruling to a taxpayer in the fertilizer industry unrelated to TNCLP which would indicate that each taxpayer's fertilizer manufacturing activities should produce qualifying income for purposes of determining whether 90% of the partnership's gross income is qualifying income. The entity to which this private letter ruling was issued would appear to operate a nitrogen fertilizer manufacturing business that is similar to ours. While this private letter ruling provides some insight into the manner in which the IRS analyzed fertilizer manufacturing activities at the time this ruling was issued, this private letter ruling is specific to a different entity. Thus, the IRS is not bound to follow it in respect of TNCLP, nor may we rely on it as precedent when determining whether we satisfy the MLP 90% gross income test. Any change in the federal income tax treatment of income from fertilizer-related activities as qualifying income could have a material impact on the taxation of the Partnership and could have a material adverse impact on unitholder distributions. We continue to monitor these IRS regulatory activities.

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TERRA NITROGEN COMPANY, L.P.

Internal Revenue Service Regulations Impacting Master Limited Partnerships

We are a master limited partnership (MLP). Partnerships are generally not subject to federal income tax, although publicly traded partnerships (such as TNCLP) are treated as corporations for federal income tax purposes and therefore are subject to federal income tax, unless at least 90% of the partnership's gross income is "qualifying income" as defined in Section 7704 of the Internal Revenue Code of 1986, as amended, and the partnership is not required to register as an investment company under the Investment Company Act of 1940. As we currently satisfy the requirements to be treated as a partnership for federal income tax purposes, no federal income taxes are paid by the Partnership.

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 was signed into law, which among other provisions allows individual taxpayers to deduct 20% of domestic qualified business income (QBI) from a partnership subject to certain limitations and thresholds. This provision is effective for tax years beginning after December 31, 2017 and before January 1, 2026. Partnerships are required to report to their investors their eligible share of QBI. We intend to report this information to our investors. The determination as to whether an investor is entitled to this benefit is an investor level decision.

Off-Balance Sheet Arrangements and Contractual Obligations

We have operating leases that are off-balance sheet arrangements. Contractual obligations and commitments to make future payments were as follows as of December 31, ~~2016~~2017:

	Payments Due by Period
	2017		2018		2019		2020		2021		Thereafter		Total
	2018		2019		2020		2021		2022		Thereafter		Total
	(in millions)
Operating leases	$	0.32	$	0.2	$	~~0.1~~—	$	—	$	—	$	—	$	0.64
Equipment purchases and plant improvements	1913.84		—		—		—		—		—		1913.84
Purchase obligations(1)	2631.36		—		—		—		—		—		2631.36
Total(2)	$	4645.42	$	0.2	$	~~0.1~~—	$	—	$	—	$	—	$	4645.74

_______________________________________________________________________________

(1) Consists of minimum commitments to purchase natural gas and other items used in our operations. Natural gas purchases are based on prevailing ONEOK forward prices as of December 31, ~~2016~~2017, and ~~does~~do not include any amounts related to our natural gas derivatives.

(2) We have unrecorded asset retirement obligations (AROs) with an estimated cost of $4.10 million in ~~2016~~2017 dollars at our Verdigris facility that are conditional upon cessation of operations and are not included in this table. For additional information on our AROs, see ~~Notes to the Consolidated Financial Statements,~~ Note 11—Asset Retirement Obligations.

~~Application of Critical Accounting Policies and Estimates~~33

Our discussion and analysis of our financial condition, results of operations, liquidity and capital resources is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). U.S. GAAP requires that we make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates. We base our estimates on historical experience, technological assessment, opinions of appropriate outside experts, and the most recent information available to us. Actual results may differ from these estimates. Changes in estimates that may have a material impact on our results are discussed in the context of the underlying financial statements to which they relate. The following discussion presents information about our most critical accounting policies and estimates.

Inventory Valuation

We review our inventory account balances at least quarterly, and more frequently if required by market conditions, to determine whether the carrying amount of inventories exceeds their market value. This review process incorporates current industry and customer-specific trends, current operating plans, historical price activity, and selling prices expected to be realized. If the carrying amount of our inventories exceeds its estimated market value, we immediately adjust our carrying values accordingly. Upon inventory liquidation, if the actual sales prices are less than our most recent estimate of market value, additional losses would be recorded in the period of liquidation. Fixed production costs related to idle capacity are not included in the cost of inventories but are charged directly to cost of sales in the period incurred.

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost and depreciation and amortization are computed using the straight-line method over the useful lives of the assets. The useful lives used in computing depreciation and amortization expenses are based on estimates of the period over which the assets will be of economic benefit to us. Useful lives are based on historical experience, manufacturers' or engineering estimates, valuation or appraisal estimates and future business plans. We review the useful lives assigned to our property, plant and equipment on a periodic basis, and change our estimates to reflect the results of those reviews.

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TERRA NITROGEN COMPANY, L.P.

~~Scheduled~~Application ~~inspections, replacements and overhauls~~ of ~~machinery~~Critical ~~and~~Accounting ~~equipment~~Policies at our continuous process manufacturing facility during a full plant shutdown are referred to as plant turnarounds. We account for plant turnarounds under the deferral method, as opposed to the direct expense or built-in overhaul methods. Under the deferral method, expenditures related to turnarounds are capitalized in property, plant and equipment when incurred and amortized to production costs on a straight-line basis over the period benefited, which is until the next scheduled turnaround in up to 5 years. Should the estimated period between turnarounds change, we may be required to amortize the remaining cost of the turnaround over a shorter period, which would lead to higher depreciation and amortization costs. If we used the direct expense method, turnaround costs would be expensed as incurred. Scheduled replacements and overhauls of plant and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalyst when a full plant shutdown occurs. Scheduled inspections are also conducted during a full plant shutdown, including required safety inspections, which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Capitalized turnaround costs have been applied consistently in the periods presented. Internal employee costs and overhead amounts are not considered turnaround costs and are not capitalized. Turnaround costs are classified as investing activities in the consolidated statements of cash flows.Estimates

Our discussion and analysis of our financial condition, results of operations, liquidity and capital resources is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). U.S. GAAP requires that we make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates. We base our estimates on historical experience, technological assessment, opinions of appropriate outside experts, and the most recent information available to us. Actual results may differ from these estimates. Changes in estimates that may have a material impact on our results are discussed in the context of the underlying financial statements to which they relate. The following discussion presents information about our most critical accounting policies and estimates.

Inventory Valuation

We review our inventory account balances at least quarterly, and more frequently if required by market conditions, to determine whether the carrying amount of inventories exceeds their net realizable value. This review process incorporates current industry and customer-specific trends, current operating plans, historical price activity, and selling prices expected to be realized. If the carrying amount of our inventories exceeds its estimated net realizable value, we immediately adjust our carrying values accordingly. Upon the sale of inventory, if the actual sales prices are less than our most recent estimate of net realizable value, additional losses would be recorded in the period of sale. Fixed production costs related to idle capacity are not included in the cost of inventories but are charged directly to cost of sales in the period incurred.

Recoverability of Long-Lived Assets

We review the carrying values of our property, plant and equipment and other long-lived assets in accordance with U.S. GAAP in order to assess recoverability. Factors that we must estimate when performing impairment tests include sales volume, selling prices, raw material costs, operating expenses, inflation, discount rates, exchange rates and capital spending. Significant judgment is involved in estimating each of these factors, which include inherent uncertainties. The factors we use are consistent with those used in our internal planning process. The recoverability of the values associated with our long-lived assets is dependent upon future operating performance. Certain of the operating assumptions are particularly sensitive to the cyclical nature of the fertilizer business. Adverse changes in demand for our products, increase in supply and the availability and costs of key raw materials could significantly affect the results of our review. The recoverability and impairment tests of long-lived assets are required only when conditions exist that indicate the carrying value may not be recoverable.

Recent Accounting Pronouncements

See ~~Notes to the Consolidated Financial Statements,~~ Note 3—New Accounting Standards for a discussion of recent accounting pronouncements.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

We are exposed to the impact of changes in the price of natural gas which we use in the manufacture of our nitrogen fertilizer products. Because natural gas prices are volatile, we manage the risk of changes in natural gas prices through the use of derivative financial instruments.

The derivative instruments that we use are primarily natural gas fixed price swaps and options. These contracts settle using NYMEX futures prices, which represent the basis for fair value at any given time. The derivatives are traded in months forward and settlements are scheduled to coincide with anticipated natural gas purchases during those future periods.

As of December 31, ~~2016~~2017 and ~~2015~~2016, we had open natural gas derivative contracts for 298.4 million MMBtus and 5929.64 million MMBtus, respectively. A $1.00 per MMBtu increase in the forward curve prices of natural gas as of December 31, ~~2016~~2017 would result in a favorable change in the fair value of these derivative positions by $277.36 million, and a $1.00 per MMBtu decrease would change their fair value unfavorably by $277.36 million.

3334

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

Report of Independent Registered Public Accounting Firm

The Partners ofand ~~Terra~~Common ~~Nitrogen~~Unit ~~Company, L.P.:~~Holders

~~We have audited the accompanying consolidated balance sheets of~~ Terra Nitrogen Company, L.P. (a Limited Partnership) (the Partnership) and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of operations, partners' capital, and cash flows for each of the years in the three-year period ended December 31, 2016. These consolidated financial statements are the responsibility of the Partnership's management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.:

WeOpinion conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on ~~a test basis, evidence supporting~~ the ~~amounts~~Consolidated ~~and~~Financial disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.Statements

InWe ~~our~~have ~~opinion~~audited the accompanying consolidated balance sheets of Terra Nitrogen Company, L.P. (a Limited Partnership) (the Partnership) as of December 31, 2017 and 2016, the related consolidated statements of operations, partners’ capital, and cash flows for each of the years in the three‑year period ended December 31, 2017, and the related notes (collectively, the consolidated financial statements). ~~referred~~In toour ~~above~~opinion, the consolidated financial statements present fairly, in all material respects, the financial position of ~~Terra~~the ~~Nitrogen~~Partnership ~~Company, L.P. and subsidiaries~~ as of December 31, ~~2016~~2017 and ~~2015~~2016, and the results of its operations and its cash flows for each of the years in the three-‑year period ended December 31, ~~2016~~2017, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), ~~Terra~~the ~~Nitrogen Company, L.P.'~~Partnership’s internal control over financial reporting as of December 31, ~~2016~~2017, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission ~~(COSO)~~, and our report dated February 2322, ~~2017~~2018 expressed an unqualified opinion on the effectiveness of the Partnership'’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ KPMG LLP

We have served as the Partnership’s auditor since 2010.

Chicago, Illinois

February 2322, ~~2017~~ 2018

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TERRA NITROGEN COMPANY, L.P.

Consolidated Balance Sheets

	December 31,
	2016		2015
	(in millions, except for units)
ASSETS
Current assets:
Cash and cash equivalents	$	39.5	$	106.4
Due from affiliates of the General Partner	4.0		10.4
Accounts receivable	0.6		0.8
Inventories	8.6		10.7
Other current assets	7.9		—
Total current assets	60.6		128.3
Property, plant and equipment—net	301.3		307.0
Other assets	11.4		8.4
Total assets	$	373.3	$	443.7
LIABILITIES AND PARTNERS' CAPITAL
Current liabilities:
Accounts payable and accrued expenses	$	27.8	$	23.5
Due to affiliates of the General Partner	4.1		4.5
Other current liabilities	—		15.9
Total current liabilities	31.9		43.9
Other liabilities	2.6		12.8
Partners' capital:
Limited partners' interests, 18,501,576 common units authorized, issued and outstanding	286.7		308.5
Limited partners' interests, 184,072 Class B common units authorized, issued and outstanding	1.8		2.3
General Partner's interest	50.3		76.2
Total partners' capital	338.8		387.0
Total liabilities and partners' capital	$	373.3	$	443.7

See accompanying Notes to the Consolidated Financial Statements.

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TERRA NITROGEN COMPANY, L.P.

~~Consolidated~~CONSOLIDATED ~~Statements~~BALANCE ~~of Operations~~SHEETS

	Year ended December 31,
	December 31,
	2016		2015		2014
	2017		2016
	(in millions, except per unit amounts)
	(in millions, except for units)
Net sales:
ASSETS
Product sales to affiliates of the General Partner	$	417.7	$	580.2	$	647.1
Current assets:
Other income from an affiliate of the General Partner	0.6		0.6		0.6
Cash and cash equivalents	$	81.5	$	39.5
Other income	—		0.9		0.6
Due from affiliates of the General Partner	17.1		4.0
Total	418.3		581.7		648.3
Accounts receivable	0.9		0.6
Cost of goods sold:
Inventories	5.3		8.6
Materials, supplies and services	163.6		228.0		237.6
Prepaid expenses and other current assets	0.3		7.9
Services provided by affiliates of the General Partner	27.9		27.9		24.0
Total current assets	105.1		60.6
Gross margin	226.8		325.8		386.7
Property, plant and equipment—net	290.2		301.3
Selling, general and administrative services provided by affiliates of the General Partner	15.7		15.7		15.6
Other assets	8.6		11.4
Other general and administrative expenses	1.9		3.2		1.1
Total assets	$	403.9	$	373.3
Earnings from operations	209.2		306.9		370.0
LIABILITIES AND PARTNERS' CAPITAL
Interest income	0.1		—		—
Current liabilities:
Net earnings	$	209.3	$	306.9	$	370.0
Accounts payable and accrued expenses	$	27.4	$	27.8
Allocation of net earnings:
Due to affiliates of the General Partner	4.2		4.1
General Partner	$	67.4	$	117.7	$	143.1
Other current liabilities	3.2		—
Class B common units	2.0		3.0		3.6
Total current liabilities	34.8		31.9
Common units	139.9		186.2		223.3
Other liabilities	1.0		2.6
Net earnings	$	209.3	$	306.9	$	370.0
Partners' capital:
Net earnings per common unit	$	7.56	$	10.06	$	12.07
Limited partners' interests, 18,501,576 common units authorized, issued and outstanding	301.2		286.7
Limited partners' interests, 184,072 Class B common units authorized, issued and outstanding	2.1		1.8
General partner's interest	64.8		50.3
Total partners' capital	368.1		338.8
Total liabilities and partners' capital	$	403.9	$	373.3

See accompanying Notes to the Consolidated Financial Statements.

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TERRA NITROGEN COMPANY, L.P.

~~Consolidated~~CONSOLIDATED ~~Statements~~STATEMENTS ofOF ~~Partners' Capital~~OPERATIONS

	CommonUnits			Class B CommonUnits			General Partner'sInterests			Total Partners'Capital
	Year ended December 31,
	(in millions)
	2017			2016			2015
Partners' capital as of December 31, 2013	$	264.5		$	1.5		$	43.0		$	309.0
	(in millions, except per unit amounts)
Net earnings	223.3			3.6			143.1			370.0
Net sales:
Distributions	(185.1		)	(2.9		)	(116.1		)	(304.1		)
Product sales to affiliates of the General Partner	$	396.1		$	417.7		$	580.2
Partners' capital as of December 31, 2014	$	302.7		$	2.2		$	70.0		$	374.9
Other income from an affiliate of the General Partner	0.6			0.6			0.6
Net earnings	186.2			3.0			117.7			306.9
Other income	0.5			—			0.9
Distributions	(180.4		)	(2.9		)	(111.5		)	(294.8		)
Total	397.2			418.3			581.7
Partners' capital as of December 31, 2015	$	308.5		$	2.3		$	76.2		$	387.0
Cost of goods sold:
Net earnings	139.9			2.0			67.4			209.3
Materials, supplies and services	212.6			163.6			228.0
Distributions	(161.7		)	(2.5		)	(93.3		)	(257.5		)
Services provided by affiliates of the General Partner	27.9			27.9			27.9
Partners' capital as of December 31, 2016	$	286.7		$	1.8		$	50.3		$	338.8
Gross margin	156.7			226.8			325.8
Selling, general and administrative services provided by affiliates of the General Partner	15.9			15.7			15.7
Other general and administrative expenses	1.7			1.9			3.2
Gain on sale of equity method investment	(14.3		)	—			—
Earnings from operations	153.4			209.2			306.9
Interest income	0.5			0.1			—
Net earnings	$	153.9		$	209.3		$	306.9
Allocation of net earnings:
General Partner	$	42.6		$	67.4		$	117.7
Class B common units	1.5			2.0			3.0
Common units	109.8			139.9			186.2
Net earnings	$	153.9		$	209.3		$	306.9
Net earnings per common unit	$	5.93		$	7.56		$	10.06

See accompanying Notes to the Consolidated Financial Statements.

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TERRA NITROGEN COMPANY, L.P.

~~Consolidated~~CONSOLIDATED ~~Statements~~STATEMENTS ofOF ~~Cash~~PARTNERS' ~~Flows~~CAPITAL

	Year ended December 31,
	CommonUnits			Class B CommonUnits			General Partner'sInterest			Total Partners'Capital
	2016			2015			2014
	(in millions)
	(in millions)
Partners' capital as of December 31, 2014	$	302.7		$	2.2		$	70.0		$	374.9
Operating Activities:
Net earnings	186.2			3.0			117.7			306.9
Net earnings	$	209.3		$	306.9		$	370.0
Distributions	(180.4		)	(2.9		)	(111.5		)	(294.8		)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Partners' capital as of December 31, 2015	$	308.5		$	2.3		$	76.2		$	387.0
Depreciation and amortization	40.4			35.8			23.5
Net earnings	139.9			2.0			67.4			209.3
Unrealized (gain) loss on derivatives	(35.3		)	24.3			11.4
Distributions	(161.7		)	(2.5		)	(93.3		)	(257.5		)
Loss on disposal of property, plant and equipment	0.1			2.0			—
Partners' capital as of December 31, 2016	$	286.7		$	1.8		$	50.3		$	338.8
Changes in operating assets and liabilities:
Net earnings	109.8			1.5			42.6			153.9
Accounts receivable	0.2			(0.4		)	0.6
Distributions	(95.3		)	(1.2		)	(28.1		)	(124.6		)
Inventories	2.0			(1.1		)	(3.7		)
Partners' capital as of December 31, 2017	$	301.2		$	2.1		$	64.8		$	368.1
Accounts payable and accrued expenses	2.5			(6.7		)	3.1
Due to/from affiliates of the General Partner	6.0			15.1			4.4
Other assets and liabilities	(1.7		)	(0.8		)	(4.0		)
Net cash provided by operating activities	223.5			375.1			405.3
Investing Activities:
Additions to property, plant and equipment	(33.1		)	(87.8		)	(67.1		)
Proceeds from sale of property, plant and equipment	0.2			0.9			—
Net cash used in investing activities	(32.9		)	(86.9		)	(67.1		)
Financing Activities:
Partnership distributions paid	(257.5		)	(294.8		)	(304.1		)
Other	—			—			(8.0		)
Net cash used in financing activities	(257.5		)	(294.8		)	(312.1		)
(Decrease) increase in cash and cash equivalents	(66.9		)	(6.6		)	26.1
Cash and cash equivalents at beginning of period	106.4			113.0			86.9
Cash and cash equivalents at end of period	$	39.5		$	106.4		$	113.0

See accompanying Notes to the Consolidated Financial Statements.

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TERRA NITROGEN COMPANY, L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS



	Year ended December 31,
	2017			2016			2015
	(in millions)
Operating Activities:
Net earnings	$	153.9		$	209.3		$	306.9
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	39.0			40.4			35.8
Unrealized loss (gain) on derivatives	10.6			(35.3		)	24.3
Loss on disposal of property, plant and equipment	—			0.1			2.0
Gain on sale of equity method investment	(14.3		)	—			—
Changes in operating assets and liabilities:
Accounts receivable	(0.3		)	0.2			(0.4		)
Inventories	3.3			2.0			(1.1		)
Accounts payable and accrued expenses	(0.9		)	2.5			(6.7		)
Due to/from affiliates of the General Partner	(13.0		)	6.0			15.1
Other assets and liabilities	(0.8		)	(1.7		)	(0.8		)
Net cash provided by operating activities	177.5			223.5			375.1
Investing Activities:
Additions to property, plant and equipment	(27.2		)	(33.1		)	(87.8		)
Proceeds from sale of property, plant and equipment	—			0.2			0.9
Proceeds from sale of equity method investment	16.3			—			—
Net cash used in investing activities	(10.9		)	(32.9		)	(86.9		)
Financing Activities:
Partnership distributions paid	(124.6		)	(257.5		)	(294.8		)
Net cash used in financing activities	(124.6		)	(257.5		)	(294.8		)
Increase (decrease) in cash and cash equivalents	42.0			(66.9		)	(6.6		)
Cash and cash equivalents at beginning of period	39.5			106.4			113.0
Cash and cash equivalents at end of period	$	81.5		$	39.5		$	106.4

See accompanying Notes to the Consolidated Financial Statements.

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TERRA NITROGEN COMPANY, L.P.

Notes to the Consolidated Financial Statements

1. Background and Basis of Presentation

Terra Nitrogen Company, L.P. ("TNCLP," "we," "our" or "us") is a Delaware limited partnership that produces nitrogen fertilizer products. Our principal products are anhydrous ammonia (ammonia) and urea ammonium nitrate ~~solutions~~solution (UAN), which we manufacture at our facility in Verdigris, Oklahoma.

We conduct our operations through an operating partnership, Terra Nitrogen, Limited Partnership (TNLP or the Operating Partnership, and collectively with TNCLP, the Partnership). We own a 99% limited partner interest in the Operating Partnership, and Terra LP Holdings LLC (TLPH), an affiliate of the General Partner, owns a 0.975% limited partner interest. Terra Nitrogen GP Inc. (TNGP or the General Partner), a Delaware corporation, is the general partner of both TNCLP and TNLP and owns a 0.025% general partner interest in each of TNCLP and TNLP. The General Partner is an indirect, wholly owned subsidiary of CF Industries Holdings, Inc. (CF Industries), a Delaware corporation. Throughout this document, the term "affiliates of the General Partner" refers to consolidated subsidiaries of CF Industries, including TNGP. Ownership of TNCLP is composed of the general partner ~~interests~~interest and the limited partner interests. The general partner interest in TNCLP is represented by 4,720 general partner units. Limited partner interests are represented by common units, which are listed for trading on the New York Stock Exchange (NYSE) under the symbol "TNH", and Class B common units. As of December 31, ~~2016~~2017, we had 18,501,576 common units and 184,072 Class B common units issued and outstanding. CF Industries through its subsidiaries owned 13,889,014 common units (representing approximately 75.1% of the total outstanding common units) and all of the Class B common units as of December 31, ~~2016~~2017. On February 7, 2018, TNCLP announced that, in accordance with Section 17.1 of TNCLP’s First Amended and Restated Agreement of Limited Partnership, as amended (the TNCLP Partnership Agreement), TNGP elected to exercise the right, assigned to TNGP by TNCLP, to purchase all of the issued and outstanding common units representing limited partner interests in TNCLP not already owned by TNGP or its affiliates (the Public Units). For additional information, see Note 15—Subsequent Event.

On January 19, 2017, the Internal Revenue Service (IRS) issued final regulations on the types of income and activities that constitute or generate qualifying income of a MLP. For calendar year MLPs, the effective date of the regulations is January 1, 2018. The regulations have the effect of limiting the types of income and activities that qualify under the MLP rules, subject to certain transition provisions. The regulations define the activities that generate qualifying income from certain processing or refining and transportation activities with respect to any mineral or natural resource (including fertilizer) as activities that generate qualifying income, but the regulations reserve on specifics regarding fertilizer-related activities. However, the IRS has issued atwo private letter ~~ruling~~rulings to ataxpayers ~~taxpayer~~ in the fertilizer industry unrelated to TNCLP (one before and one after the issuance of the final regulations) which would indicate that each taxpayer's fertilizer manufacturing activities should produce qualifying income for purposes of determining whether 90% of the partnership's gross income is qualifying income under the final regulations. The ~~entity~~entities to which ~~this~~these private letter ~~ruling~~rulings ~~was~~were issued would appear to operate a nitrogen fertilizer manufacturing ~~business~~businesses that isare similar to ours. While ~~this~~these private letter ~~ruling~~rulings ~~provides~~provide some insight into the manner in which the IRS analyzed fertilizer manufacturing activities at the time ~~this~~these ~~ruling~~rulings ~~was~~were issued, ~~this~~these private letter ~~ruling~~rulings isare specific to a different ~~entity~~entities. Thus, the IRS is not bound to follow itthem in respect of TNCLP, nor may we rely on itthem as precedent when determining whether we satisfy the MLP 90% gross income test. Any change in the federal income tax treatment of income from fertilizer-related activities as qualifying income could have a material impact on the taxation of the Partnership and could have a material adverse impact on unitholder distributions. We continue to monitor these IRS regulatory activities.

Throughout this document, references to "affiliates of the General Partner" refer to the consolidated subsidiaries of CF Industries, including TNGP.

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (U.S. GAAP).

~~2. Summary of Significant Accounting Policies~~40

Consolidation

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TERRA NITROGEN COMPANY, L.P.

2. Summary of Significant Accounting Policies

Consolidation

The consolidated financial statements of TNCLP and the accompanying notes include the accounts of the Partnership. All intercompany transactions and balances have been eliminated. Income is allocated to the General Partner and the limited partners of TNCLP (Limited Partners) in accordance with the provisions of the TNCLP Partnership Agreement that provides for allocations of income between the Limited Partners and the General Partner in the same proportion as cash distributions related to such year. The 0.975% limited partner interest and the 0.025% general partner interest in the Operating Partnership held by TLPH and the General Partner, respectively, are included in the line labeled General Partner’s interest in the consolidated financial statements.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses for the periods presented. Actual results could differ from these estimates. Significant estimates and assumptions are used for, but are not limited to, the net realizable value of inventories, environmental remediation liabilities, environmental and litigation contingencies, useful lives of property, plant and equipment, the assumptions used in the evaluation of potential impairments of property, plant and equipment and the ~~allowances~~allowance for doubtful accounts receivable.

Revenue Recognition

The ~~basic~~primary ~~criteria~~products ~~necessary~~we ~~for~~sell ~~revenue recognition~~ are: ~~1) evidence~~ammonia ~~that~~and aUAN. ~~sales~~Sales ~~arrangement~~are ~~exists,~~made ~~2) delivery~~in ofaccordance ~~goods~~with ~~has occurred, 3)~~ the ~~seller's~~Amendment ~~price~~ to the ~~buyer~~General isand ~~fixed~~Administrative orServices ~~determinable,~~ and ~~4) collectability~~Product isOfftake ~~reasonably~~Agreement ~~assured.~~(the ~~The~~Services ~~title~~ and ~~risk~~Offtake ofAgreement) ~~loss~~we ~~passes~~have towith an affiliate of the General Partner asunder ~~the~~which ~~product~~affiliates isof ~~shipped~~the ~~from~~General ~~the~~Partner ~~plant~~purchase ~~gate~~our products. We recognize revenue ~~when~~as ~~these~~products ~~criteria~~are ~~have~~shipped ~~been~~from ~~met~~the ~~and~~plant gate when title and risk of loss ~~have~~transfer ~~been~~to ~~transferred~~affiliates toof the General Partner. The Services and Offtake Agreement is accounted for as an ~~affiliate~~operating lease comprised entirely of variable lease payments associated with the ~~General~~sale ~~Partner~~of our products. The Services and Offtake Agreement is described in Note 10—Related Party Transactions.

Cash and Cash Equivalents

Cash and cash equivalents include highly liquid investments that are readily convertible to known amounts of cash with original maturities of three months or less. The carrying value of cash and cash equivalents approximates fair value.

Due to/from Affiliates of the General Partner

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are recorded at face amounts less an allowance for doubtful accounts. The allowance is an estimate based on historical collection experience, current economic and market conditions, and a review of the current status of each customer's trade accounts receivable. A receivable is past due if payments have not been received within the agreed upon invoice terms. Account balances are charged-off against the allowance when management determines that it is probable the receivable will not be recovered.

Inventories

Inventories are reported at the lower of cost orand ~~market~~net realizable value and are determined on a first-in, first-out (FIFO) and average cost basis. Inventories include the cost of materials, production labor and production overhead. ~~Market~~Net realizable value is reviewed quarterly. Fixed production costs related to idle capacity are not included in the cost of inventories but are charged directly to cost of sales. On January 1, 2017, we adopted Accounting Standards Update (ASU) No. 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, as discussed in Note 3—New Accounting Standards.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. ~~Depreciation~~ and ~~amortization~~ are ~~computed~~subject ~~using~~to the ~~straight-line~~Services ~~method~~and ~~over~~Offtake ~~the estimate useful life of the property~~Agreement, ~~plant~~which ~~and~~is ~~equipment.~~accounted ~~Useful~~for ~~lives~~as ~~for~~an ~~property,~~operating ~~plant~~lease, ~~and~~as ~~equipment~~described ~~range~~in ~~from~~Note 10—Related toParty 40Transactions. ~~years~~Depreciation ~~for buildings~~ and 5amortization toare 30computed ~~years~~using ~~for~~the ~~machinery~~straight-line ~~and~~method ~~equipment.~~over Wethe ~~periodically~~estimated ~~review these~~ useful ~~lives~~life ~~and~~of ~~change~~ the ~~estimates~~property, toplant ~~reflect~~and ~~the~~equipment. ~~results~~Useful oflives ~~those~~for ~~reviews.~~

Scheduled inspections, replacements and overhauls of machinery and equipment at our continuous process manufacturing facility are referred to as plant turnarounds. Plant turnarounds are accounted for under the deferral method, as opposed to the direct expense or built-in overhaul methods. Under the deferral method, expenditures related to turnarounds are capitalized when incurred and amortized to production costs on a straight-line basis over the period benefited, which is until the next scheduled turnaround in up to 5 years. If the direct expense method were used, all turnaround costs would be expensed as incurred. Internal employee costs and overhead amounts are not considered turnaround costs and are not capitalized. Turnaround costs are classified as investing activities in our consolidated statements of cash flows. For additional information, see Note 9—Property, Plant and Equipment—Net.41

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property, plant, and equipment range from 10 to 40 years for buildings and 3 to 30 years for machinery and equipment. We periodically review these useful lives and change the estimates to reflect the results of those reviews.

Recoverability of Long-Lived Assets

We review property, plant and equipment and other long-lived assets in order to assess recoverability based on expected future undiscounted cash flows whenever events or circumstances indicate that the carrying value may not be recoverable. If the sum of the expected future net cash flows is less than the carrying value, an impairment loss is recognized. The impairment loss is measured as the amount by which the carrying value exceeds the fair value of the asset.

Other Leases

Leases are classified as either operating leases or capital leases. Assets acquired under capital leases are depreciated on the same basis as property, plant and equipment. We currently do not have any capital leases. Rental payments, including rent holidays, leasehold incentives, and scheduled rent increases, if any, are expensed on a straight-line basis over the lease term.

Income Taxes

As a partnership, we are not subject to income taxes. For additional information, see Note 1—Background and Basis of Presentation. The income tax liability of the individual partners is not reflected in our consolidated financial statements.

Derivative Financial Instruments

Natural gas is the principal raw material used to produce nitrogen fertilizers. We use natural gas both as a chemical feedstock and as a fuel to produce ammonia and UAN. We manage the risk of changes in natural gas prices primarily through the use of derivative financial instruments. The derivative instruments that we use are primarily natural gas fixed price swaps and options traded in the over-the-counter markets. These derivatives reference NYMEX futures contract prices, which represent the basis for fair value at any given time. The derivatives are traded in months forward and settlements are scheduled to coincide with anticipated gas purchases during those future periods. We do not use derivatives for trading purposes and are not a party to any leveraged derivatives. We have elected to not apply hedge accounting to our derivatives; as a result, changes in the fair value of the derivatives are recorded in cost of goods sold onin our consolidated statements of operations.

Derivatives are recognized onin our consolidated balance sheets at fair value. Cash flows related to natural gas derivatives are reported as operating activities in our consolidated statements of cash flows. For additional information ~~on derivatives~~, see Note 7—Derivative Financial Instruments.

Asset Retirement Obligations

Environmental

Environmental expenditures that relate to current operations are expensed or capitalized as appropriate. Expenditures that relate to an existing condition caused by past operations are expensed. Expenditures that increase the capacity or extend the useful life of an asset, improve the safety or efficiency of the operations, or mitigate or prevent future environmental contamination are capitalized. Liabilities are recorded when it is probable that a liability has been incurred, the costs can be reasonably estimated, and the liability would not be discounted.

~~Litigation~~42

From time to time, the Partnership is subject to ordinary, routine legal proceedings related to the usual conduct of its business. From time to time, the Partnership also is involved in legal proceedings regarding public utility and transportation rates, environmental matters, taxes and permits relating to the operations of its plant and facilities. Accruals for such contingencies are recorded to the extent management concludes their occurrence is probable and the financial impact of an adverse outcome is reasonably estimable. Disclosure for specific legal contingencies is provided if the likelihood of occurrence is at least reasonably possible and the exposure is considered material to the consolidated financial statements. In making determinations of likely outcomes of litigation matters, many factors are considered. These factors include, but are not limited to, past history, scientific and other evidence, and the specifics and status of each matter. If the assessment of various factors changes, the estimates may change. Predicting the outcome of claims and litigation, and estimating related costs and exposure involves substantial uncertainties that could cause actual costs to vary materially from estimates and accruals. Legal fees are

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~~expensed as incurred and are included in selling, general, and administrative services provided by affiliates of the General Partner on our consolidated statements of operations.~~Litigation

3. New Accounting Standards

InRecently ~~February~~Adopted 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases (Topic 842), which supersedes the lease accounting requirements in Accounting Standards Codification (ASC) Topic 840, Leases. This ASU will require lessees to recognize the rights and obligations resulting from virtually all leases (other than leases that meet the definition of a short-term lease) on their balance sheets as right-of-use assets with corresponding lease liabilities. Quantitative and qualitative disclosures, including significant judgments made by management, will be required. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted, and requires the modified retrospective method of adoption. We expect the adoption of this ASU will not have a material impact on our consolidated financial statements or disclosures.Pronouncement

InOn ~~July~~January ~~2015~~1, ~~the~~2017, ~~FASB~~we ~~issued~~adopted ASU No. 2015-11, ~~Simplifying the Measurement of~~ Inventory (~~an update to~~ Topic 330~~, Inventory~~),: ~~effective~~Simplifying ~~for~~the ~~annual~~Measurement ~~and~~of ~~interim periods beginning after December 15, 2016~~Inventory. ASU No. 2015-11 changes the inventory measurement principle for entities using the FIFO or average cost methods. For entities utilizing one of these methods, the inventory measurement principle ~~will~~changed ~~change~~ from the lower of cost or market to the lower of cost and net realizable value. We ~~use~~follow the FIFO and average cost methods, and ~~expect~~ the adoption of this ASU ~~will~~did not have a material ~~impact~~effect on our consolidated financial statements.

InRecently ~~May~~Issued 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments. Additionally, information concerning the costs to obtain and fulfill a contract, including assets to be recognized, is to be capitalized and disclosed. In July 2015, the FASB voted to defer the effective date of this ASU through the issuance of ASU No. 2015-14, Revenue from Contracts with Customers: Deferral of the Effective Date, to December 15, 2017 for interim and annual reporting periods beginning after that date. Early adoption of the standard as of December 15, 2016 (for interim and annual reporting periods beginning after that date) is permitted by the FASB. We are currently evaluating the impact of the adoption of this ASU on the Amendment to the General and Administrative Services and Product Offtake Agreement (the Services and Offtake Agreement), through which we sell all of our fertilizer products to affiliates of the General Partner, and the related impact on our consolidated financial statements.Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers, (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) Topic 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments. Additionally, the costs to obtain and fulfill a contract, including assets to be recognized, are to be capitalized and such capitalized costs are to be disclosed. All of our nitrogen fertilizer production is sold to affiliates of the General Partner. The Services and Offtake Agreement, under which all of our nitrogen fertilizer products are sold, is accounted for as an operating lease comprised entirely of variable lease payments associated with the sale of our nitrogen fertilizer products, therefore, it does not meet the definition of a contract as defined by ASU No. 2014-09. As such, our adoption of ASU No. 2014-09 on January 1, 2018 did not have a material impact on our consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which supersedes the lease accounting requirements in ASC Topic 840, Leases. This ASU will require lessees to recognize the rights and obligations resulting from virtually all leases (other than leases that meet the definition of a short-term lease) on their balance sheets as right-of-use assets with corresponding lease liabilities. For lessors, ASU No. 2016-02 leaves the current lessor accounting in ASC Topic 840 largely unchanged. Quantitative and qualitative disclosures, including significant judgments made by management, will be required. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted, and requires the modified retrospective method of adoption. Under ASU No. 2016-02, and consistent with the current accounting treatment under ASC Topic 840, we expect that the Services and Offtake Agreement will continue to be accounted for as an operating lease. We expect the adoption of this ASU will not have a material impact on our consolidated financial statements.

In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedged items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted in any interim period. We do not expect the adoption of this ASU will have a material effect on our consolidated financial statements.

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4. Agreement of Limited Partnership

Ownership of TNCLP is composed of the general partner ~~interests~~interest and the limited partner interests (see Note 1—Background and Basis of Presentation). Holders of common units and Class B common units do not have preemptive rights. Holders of common units are entitled to one vote per common unit with respect to each matter on which holders of common units are entitled to vote. The Class B common units have no voting rights on any matter. Unitholders have only limited voting rights on matters affecting our business and, therefore, limited ability to influence management's decisions regarding our business. Unitholders have no right to elect the General Partner or the TNGP Board of Directors on an annual or other continuing basis. Furthermore, the General Partner may only be removed by a vote of the holders of at least 66 2/3% of our outstanding common units, including any common units held by the General Partner and its affiliates (including CF Industries). Given that the General Partner and its affiliates own approximately 75.1% of our outstanding common units, holders of our publicly- traded common units are not able to remove the General Partner under any circumstances.

WeThe ~~make~~General ~~quarterly~~Partner ~~distributions to holders of our general partner interest~~ and ~~limited~~its ~~partner~~affiliates ~~interests~~own ~~based~~approximately on75.1% ~~Available~~of ~~Cash for the quarter as defined in~~ our ~~agreement~~outstanding ofcommon ~~limited partnership~~units. ~~Available~~When ~~Cash~~not ismore ~~defined~~than ~~generally~~25% asof ~~all~~our ~~cash~~issued ~~receipts~~and ~~less~~outstanding ~~all~~common ~~cash~~units ~~disbursements,~~are ~~less~~held ~~certain~~by ~~reserves~~persons ~~(including~~other ~~reserves~~than ~~for future operating and capital needs) established as~~ the General Partner ~~determines~~and in its ~~reasonable~~affiliates ~~discretion~~(collectively, tonon-affiliated bepersons), ~~necessary or appropriate. Changes in working capital affect Available Cash~~ as ~~changes~~was in the ~~amount~~case ofat ~~cash~~December 31, ~~invested~~2017, inwe, ~~working~~at ~~capital~~the ~~items~~General ~~(such~~Partner's assole ~~increases~~discretion, inmay ~~inventory and decreases in accounts payable) reduce Available Cash~~call, ~~while~~or ~~declines~~assign into the ~~amount~~General ofPartner ~~cash~~or ~~invested~~its inaffiliates, ~~working~~our ~~capital~~right ~~items~~to ~~increase~~acquire ~~Available~~all, ~~Cash.~~but Wenot ~~declared~~less ~~and~~than ~~paid distributions of $257.5 million~~all, ~~$294.8 million~~such ~~and~~outstanding ~~$304.1 million~~common tounits ~~our~~held ~~unitholders~~by innon-affiliated ~~2016, 2015 and 2014, respectively~~persons.

WeOn ~~receive~~February ~~99%~~7, 2018, TNCLP announced that, in accordance with Section 17.1 of the ~~Operating~~TNCLP Partnership's ~~Available~~Agreement, ~~Cash~~TNGP elected ~~(as~~to ~~defined~~exercise in the ~~Operating~~right, ~~Partnership's~~assigned ~~agreement~~to ofTNGP ~~limited~~by ~~partnership)~~TNCLP, ~~and~~to 1%purchase all of the ~~Operating~~issued ~~Partnership's~~and ~~Available~~outstanding ~~Cash~~common isunits ~~distributed~~representing limited partner interests in TNCLP not already owned by ~~the~~TNGP ~~Operating~~or ~~Partnership~~its toaffiliates (the Public Units).

42TNGP will purchase the Public Units on April 2, 2018 for a cash purchase price of $84.033 per Public Unit. The purchase price was determined in accordance with Section 17.1 of the TNCLP Partnership Agreement as the average of the daily closing prices per common unit for the 20 consecutive trading days beginning with January 5, 2018 and ending with February 2, 2018.

We make quarterly distributions to holders of our general partner interest and limited partner interests based on Available Cash for the quarter as defined in the TNCLP Partnership Agreement. Available Cash is defined generally as all cash receipts less all cash disbursements, less certain reserves (including reserves for future operating and capital needs) established as the General Partner determines in its reasonable discretion to be necessary or appropriate. Changes in working capital affect Available Cash as increases in the amount of cash invested in working capital items (such as increases in receivables or inventory and decreases in accounts payable) reduce Available Cash, while declines in the amount of cash invested in working capital items increase Available Cash. During the years ended December 31, 2017, 2016 and 2015, we declared and paid partnership distributions of $124.6 million, $257.5 million and $294.8 million, respectively.

Pursuant to the TNCLP Partnership Agreement, distributions of our Available Cash are made 99.975% to common and Class B common unitholders and 0.025% to the General Partner except that the General Partner is entitled, as an incentive, to a larger percentage of our distribution of Available Cash to the extent that cumulative distributions of Available Cash exceed specified target levels above the Minimum Quarterly Distributions (MQD) of $0.605 per unit. The General Partner has assigned its right to receive such incentive distributions to an affiliate of the General Partner.

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~~General~~In ~~Partner~~the ~~and~~fourth ~~its~~quarter ~~affiliates. Pursuant to our agreement~~ of ~~limited partnership~~2017, ~~distributions~~we ofexceeded ~~our~~the ~~Available~~cumulative ~~Cash~~MQD ~~are~~amounts ~~made 99.975% to common~~ and ~~Class B~~will ~~common~~distribute ~~unitholders and 0.025% to the General Partner except that the General Partner is entitled, as an incentive, to a larger percentage of our distribution of~~ Available Cash toas ~~the~~summarized ~~extent~~in ~~that cumulative distributions of Available Cash exceed specified target levels above~~ the ~~Minimum~~following ~~Quarterly Distributions (MQD) of $0.605 per unit. The General Partner has assigned its right to receive such incentive distributions to an affiliate of the General Partner.~~table:

On February 6, 2017, we announced a $1.22 cash distribution per common unit, payable on February 28, 2017 to holders of record as of February 17, 2017. In the fourth quarter of 2016, we exceeded the cumulative MQD amounts and will distribute Available Cash as summarized in the following table:



	Quarterly Income and Distribution Allocation
	Target Limit (per unit)		Target Increment (per unit)		Distribution Threshold (in millions) ⁽¹⁾		Common Units		Class B Common Units		General Partner ⁽²⁾		Total
Minimum Quarterly Distributions	$	0.605	$	0.605	$	11.3	98.990	%	0.985	%	0.025	%	100	%
First Target	0.715		0.110		13.4		98.990	%	0.985	%	0.025	%	100	%
Second Target	0.825		0.110		15.4		85.859	%	0.985	%	13.156	%	100	%
Third Target	1.045		0.220		19.5		75.758	%	0.985	%	23.257	%	100	%
Final Target and Beyond	>1.045		—		> 19.5		50.505	%	0.985	%	48.510	%	100	%

	Income and Distribution Allocation
	TargetLimit		TargetIncrement		CommonUnits		Class BCommonUnits		GeneralPartner(1)		Total
Minimum Quarterly Distributions	$	0.605	$	0.605	98.990	%	0.985	%	0.025	%	100.00	%
First Target	0.715		0.110		98.990	%	0.985	%	0.025	%	100.00	%
Second Target	0.825		0.110		85.859	%	0.985	%	13.156	%	100.00	%
Third Target	1.045		0.220		75.758	%	0.985	%	23.257	%	100.00	%
Final Target and Beyond	>1.045		—		50.505	%	0.985	%	48.510	%	100.00	%

_______________________________________________________________________________

(1) ~~Reflects~~The ~~Minimum~~Distribution ~~Quarterly~~Threshold ~~Distributions~~represents ~~and~~the ~~incentive~~cumulative ~~distributions~~amount toof ~~the~~Available ~~General~~Cash ~~Partner.~~necessary ~~The~~to ~~General~~distribute ~~Partner~~the ~~has~~Target ~~assigned~~Limit ~~its~~per ~~right~~unit, toas ~~incentive~~shown ~~distributions~~in the table above, to anall ~~affiliate~~unitholders ofand the General Partner based on the number of units outstanding as of December 31, 2017.

~~The~~(2) ~~quarterly~~Reflects ~~cash~~Minimum Quarterly Distributions and incentive distributions to the ~~unitholders~~General ~~and~~Partner. ~~the~~The General Partner ~~declared~~has inassigned ~~2016~~its ~~and~~right ~~2015~~to ~~are~~incentive asdistributions ~~follows:~~to an affiliate of the General Partner.

		Common Units				Class BCommon Units				General Partner		Total Distributions Declared
		Total		Per unit		Total		Per unit		Total
		(in millions, except per unit amounts)
2016
	First Quarter	$	53.3	$	2.88	$	0.9	$	4.78	$	36.0	$	90.2
	Second Quarter	28.0		1.51		0.4		2.09		11.1		39.5
	Third Quarter	47.7		2.58		0.7		4.17		30.4		78.8
	Fourth Quarter	32.7		1.77		0.5		2.60		15.8		49.0
2015
	First Quarter	$	46.3	$	2.50	$	0.7	$	4.03	$	29.1	$	76.1
	Second Quarter	38.5		2.08		0.6		3.20		21.3		60.4
	Third Quarter	43.6		2.36		0.7		3.74		26.5		70.8
	Fourth Quarter	52.0		2.81		0.9		4.64		34.6		87.5

We paid distributions of $5.15, $8.74 and $9.75 per common unit during 2017, 2016 and 2015, respectively. We also paid distributions of $6.61, $13.64 and $15.61 per Class B common unit during 2017, 2016 and 2015, respectively.

AsThe ofquarterly ~~December 31,~~cash ~~2016,~~distributions ~~the~~to ~~General Partner and its affiliates owned approximately 75.1% of our outstanding common units. When not more than 25% of our issued and outstanding common units are held by persons other than~~ the ~~General~~unitholders ~~Partner~~ and ~~its affiliates (collectively, non-affiliated persons), as was~~ the ~~case at December 31, 2016, we, at the~~ General Partner's ~~sole~~declared ~~discretion, may call, or assign~~ to ~~the~~date ~~General~~in ~~Partner~~2018 orand ~~its~~during ~~affiliates,~~2017 ~~our~~and ~~right~~2016 ~~to acquire all, but not less than all, such outstanding common units held by non-affiliated persons. If the General Partner elects to acquire all outstanding common units, we~~ are required to give at least 30 but not more than 60 days' notice of our decision to purchase the outstanding common units. The purchase price per unit will be the greater of (1) the average of the previous 20 trading days' closing prices as of the date five days before the purchase is announced or (2) the highest price paid by the General Partner or any of its affiliates for any unit within the 90 days preceding the date the purchase is announced.follows:



Distribution		Common Units				Class B Common Units				General Partner		Total Distributions Declared
Declared in	Related to	Total		Per unit		Total		Per unit		Total		Total Distributions Declared
		(in millions, except per unit amounts)

First Quarter 2018	Fourth Quarter 2017	$	37.6	$	2.03	$	0.6	$	3.10	$	20.4	$	58.6

First Quarter 2017	Fourth Quarter 2016	$	22.6	$	1.22	$	0.3	$	1.52	$	5.7	$	28.6
Second Quarter 2017	First Quarter 2017	17.9		0.97		0.2		1.04		1.4		19.5
Third Quarter 2017	Second Quarter 2017	29.6		1.60		0.4		2.26		12.7		42.7
Fourth Quarter 2017	Third Quarter 2017	25.2		1.36		0.3		1.79		8.3		33.8

First Quarter 2016	Fourth Quarter 2015	$	53.3	$	2.88	$	0.9	$	4.78	$	36.0	$	90.2
Second Quarter 2016	First Quarter 2016	28.0		1.51		0.4		2.09		11.1		39.5
Third Quarter 2016	Second Quarter 2016	47.7		2.58		0.7		4.17		30.4		78.8
Fourth Quarter 2016	Third Quarter 2016	32.7		1.77		0.5		2.60		15.8		49.0

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5. Net Earnings per Common Unit

Net income and net losses are allocated to the common units, Class B common units and the general partner interest in accordance with the provisions of the TNCLP Partnership Agreement. In general, the TNCLP Partnership Agreement provides that if the Partnership has a net profit for a year, net income (including any undistributed net earnings) will be allocated among the General Partner and limited partners in the same proportion that Available Cash for such year was declared among the General Partner and the limited partners. If the Partnership has a net loss for a year, the loss will be allocated among the General Partner and limited partners in the same proportion as any net income was allocated to such partners in prior years (beginning with the first year in which net income was allocated to the partners). Net earnings per common unit are calculated using the two-class method and are based on the weighted-average number of common units outstanding during the period. The following table provides a calculation for net earnings per common unit for the years ended December 31, ~~2016~~2017, ~~2015~~2016 and ~~2014~~2015:

	Year Ended December 31,
	2016			2015			2014
	2017			2016			2015
	(in millions, except per unit amounts)
Basic earnings per Common Unit:
Basic earnings per common unit:
Net earnings	$	~~209~~153.39		$	~~306~~209.93		$	~~370~~306.09
Less: Net earnings allocable to General Partner	67.4			117.7			143.1
Less distributions declared to:
Less: Net earnings allocable to Class B common units	2.0			3.0			3.6
Common units	110.3			130.9			187.4
Net earnings allocable to common units	$	139.9		$	186.2		$	223.3
Class B common units	1.5			1.9			3.1
General partner interest	42.8			63.1			118.4
(Distributions in excess of earnings) undistributed earnings	$	(0.7	)	$	13.4		$	(2.0	)
Allocation percentage for undistributed earnings or distributions in excess of earnings (1):
Common units	71.33		%	66.82		%	60.67		%
Class B common units	0.97		%	0.97		%	0.97		%
General partner interest	27.70		%	32.21		%	38.36		%
Allocation of (distributions in excess of earnings) undistributed earnings to:
Common units	$	(0.5	)	$	9.0		$	(1.2	)
Class B common units	—			0.1			(0.1		)
General partner interest	(0.2		)	4.3			(0.7		)
Total (distributions in excess of earnings) undistributed earnings	$	(0.7	)	$	13.4		$	(2.0	)
Net earnings allocable to General Partner (2)	$	42.6		$	67.4		$	117.7
Net earnings allocable to Class B common units	$	1.5		$	2.0		$	3.0
Net earnings allocable to common units	$	109.8		$	139.9		$	186.2
Weighted-average common units outstanding	18.5			18.5			18.5
Net earnings per common unit	$	75.5693		$	107.0656		$	1210.0706

~~There~~(1) ~~were~~In noaccordance ~~dilutive~~with the TNCLP ~~units~~Partnership ~~outstanding~~Agreement, undistributed earnings or distributions in excess of earnings are allocated in the same percentage that Available Cash for such period was declared among the ~~years~~General ~~ended~~Partner ~~December 31,~~(including ~~2016,~~with ~~2015~~respect to the embedded incentive distribution rights) and ~~2014~~limited partners.


⁽²⁾	Net earnings allocable to the General Partner include net earnings allocated to the General Partner and TLPH from the Operating Partnership of $1.5 million, $2.1 million and $3.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.

There were no dilutive TNCLP units outstanding for the years ended December 31, 2017, 2016 and 2015 and therefore basic and diluted net earnings per common unit are the same.

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TERRA NITROGEN COMPANY, L.P.

6. Inventories

Inventories consisted of the following:

	December 31,
	2016		2015
	2017		2016
	(in millions)
Finished goods	$	63.85	$	76.28
Raw materials, spare parts and supplies	1.8		31.58
Total	$	85.63	$	108.76

7. Derivative Financial Instruments

The derivatives that we use are primarily natural gas fixed price swaps and options traded in the over-the-counter (OTC) markets. The derivative contract prices are based on NYMEX future prices based on physical delivery of natural gas at the Henry Hub in Louisiana, the most common and financially liquid location of reference for derivative financial instruments related to natural gas. However, we purchase natural gas for our manufacturing facility from suppliers whose prices are based primarily on the ONEOK index (based on physical delivery of natural gas in Oklahoma, rather than at the Henry Hub). This creates a location basis differential between the derivative contract price and the price we pay for physical delivery of natural gas. Accordingly, the prices underlying the derivative financial instruments we use may not exactly match the prices of natural gas we purchase and consume. We enter into natural gas derivative contracts with respect to gas to be consumed by us in the future, and settlements of those derivative contracts are scheduled to coincide with our anticipated purchases of natural gas used to manufacture nitrogen products during those future periods. We use natural gas derivatives as an economic hedge of gas price risk, but without the application of hedge accounting.

WeThe ~~report~~gross fair values of derivatives onin our consolidated balance sheets atare ~~fair~~shown ~~value~~below. ~~Changes~~All inbalance ~~fair~~sheet ~~value~~amounts ~~are~~from ~~recognized~~derivatives inarise ~~cost~~from ofnatural ~~goods~~gas ~~sold~~derivatives inthat ~~the~~are ~~period~~not ofdesignated ~~change.~~as ~~Cash~~hedging ~~flows~~instruments. ~~related~~For toadditional ~~natural~~information ~~gas~~on ~~derivatives~~derivative ~~are~~fair ~~reported~~values, assee ~~operating~~Note 8—Fair ~~activities~~Value Measurements.

The gross fair values of derivatives on our consolidated balance sheets are shown below. All balance sheet amounts from derivatives arise from natural gas derivatives that are not designated as hedging instruments. For additional information on derivative fair values, see Note 8—Fair Value Measurements.



	December 31,
	2017			2016
	(in millions)
Derivative Assets
Unrealized gains in other current assets	$	—		$	7.9
Unrealized gains in other assets	—			1.1
Total derivative assets	—			9.0
Derivative Liabilities
Unrealized losses in other current liabilities	(3.2		)	—
Unrealized losses in other liabilities	—			(1.6		)
Total derivative liabilities	(3.2		)	(1.6		)
Net derivative (liabilities) assets	$	(3.2	)	$	7.4

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	December 31,
	2016			2015
	(in millions)
Derivative Assets
Unrealized gains in other current assets	$	7.9		$	—
Unrealized gains in other assets	1.1			—
Total derivative assets	9.0			—
Derivative Liabilities
Unrealized losses in other current liabilities	—			(15.9		)
Unrealized losses in other liabilities	(1.6		)	(12.0		)
Total derivative liabilities	(1.6		)	(27.9		)
Net derivative assets (liabilities)	$	7.4		$	(27.9	)

The effect of derivatives in our consolidated statements of operations is shown below. All amounts arise from natural gas derivatives that are not designated as hedging instruments and are recorded in cost of goods sold.

	Year ended December 31,
	2016			2015			2014
	2017			2016			2015
	(in millions)
Unrealized net mark-to-market gains (losses)	$	35.3		$	(23.1	)	$	(12.6	)
Unrealized net mark-to-market (losses) gains	$	(10.6	)	$	35.3		$	(23.1	)
Realized net (losses) gains	(16.7		)	(10.6		)	10.5
Realized net losses	(3.0		)	(16.7		)	(10.6		)
Net derivative gains (losses)	$	18.6		$	(33.7	)	$	(2.1	)
Net derivative (losses) gains	$	(13.6	)	$	18.6		$	(33.7	)

As of December 31, ~~2016~~2017 and ~~2015~~2016, we had open natural gas derivative contracts for 298.4 million MMBtus (millions of British thermal units) of natural gas and 5929.64 million MMBtus of natural gas, respectively. The derivative portfolio at December 31, 2017 includes natural gas derivatives that economically hedge a portion of anticipated natural gas purchases through December 2018. For the year ended December 31, ~~2016~~2017, we used derivatives to cover approximately 7448% of our natural gas consumption.

The counterparties to our derivative contracts are multinational commercial banks, other major financial institutions and large energy companies. The derivatives are executed with several counterparties, generally under International Swaps and Derivatives Association (ISDA) agreements. The ISDA agreements are master netting arrangements commonly used for OTC derivatives that mitigate exposure to counterparty credit risk, in part, by creating contractual rights of netting and setoff, the specifics of which vary from agreement to agreement. These rights are described further below:


•	Settlement netting generally allows the parties to net, into a single net payable or receivable, ordinary settlement obligations arising under the ISDA agreement on the same day, in the same currency, for the same types of derivative instruments, and through the same pairing of offices.

•

Close-out netting rights are provided in the event of a default or other termination event (as defined in the ISDA agreements), including bankruptcy. Depending on the cause of early termination, the non-defaulting party may elect to terminate all or some transactions outstanding under the ISDA agreement. The values of all terminated transactions and certain other payments under the ISDA agreement are netted, resulting in a single net close-out amount payable to or by the non-defaulting party. Termination values may be determined using a mark-to-market approach or based on a party's good faith estimate of its loss. If the final net close-out amount is payable by the non-defaulting party, that party's obligation to make the payment may be conditioned on factors such as the termination of all derivative transactions between the parties or payment in full of all of the defaulting party's obligations to the non-defaulting party, in each case regardless of whether arising under the ISDA agreement or otherwise.

•

Setoff rights are provided by certain of the ISDA agreements and generally allow a non-defaulting party to elect to set off, against the final net close-out payment, other matured and contingent amounts payable between the parties under the ISDA agreement or otherwise. Typically, these setoff rights arise upon the early termination of all transactions outstanding under an ISDA agreement following a default or specified termination event.

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Most of the ISDA agreements contain credit-risk-related contingent features such as cross-default provisions and credit support thresholds that are dependent upon the credit ratings of the General Partner affiliate. In the event of certain defaults or a credit ratings downgrade of the General Partner affiliate, the counterparty may request early termination and net settlement of certain derivative trades or may require the General Partner affiliate to collateralize derivatives in a net liability position. The General Partner affiliate’s revolving credit agreement, at any time when it is secured, provides a cross collateral feature for those derivatives that are with counterparties that are party to, or affiliates of parties to, the revolving credit agreement so that no separate collateral would be required for those counterparties in connection with such derivatives. In the event the General Partner ~~Affiliate~~affiliate's revolving credit agreement becomes unsecured, the General Partner affiliate could be required to post separate collateral in connection with such derivatives. As of December 31, ~~2016~~2017 and ~~2015~~2016, the aggregate fair value of the derivative instruments with credit-risk-related contingent features in a net liability ~~positions~~position was $13.62 million and $271.96 million, respectively, which also approximates the fair value of the maximum amount of assets needed to settle the obligations if the credit-risk-related contingent features were triggered and the General Partner affiliate was unable to post collateral at the reporting dates. As of December 31, ~~2016~~2017 and ~~2015~~2016, we and the General Partner affiliate had no cash collateral on deposit for derivative contracts assigned to us. The credit support documents executed in connection with certain ISDA agreements generally provide the General Partner affiliate and the counterparties the right to set off collateral against amounts owing under the ISDA agreements upon the occurrence of a default or a specified termination event.

The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of December 31, ~~2016~~2017 and ~~2015~~2016:

				Gross amounts not offset in consolidated balance sheets
	Gross and net amounts presented inconsolidated balance sheets(1)			Financialinstruments			Cashcollateralreceived(pledged)		Netamount
	Gross and net amounts presented inconsolidated balance sheets (1)			Financialinstruments			Cashcollateralreceived(pledged)		Netamount
	(in millions)
December 31, 2017
Total derivative assets	$	—		$	—		$	—	$	—
Total derivative liabilities	(3.2		)	—			—		(3.2		)
Net derivative liabilities	$	(3.2	)	$	—		$	—	$	(3.2	)
December 31, 2016
Total derivative assets	$	9.0		$	1.6		$	—	$	7.4
Total derivative liabilities	(1.6		)	(1.6		)	—		—
Net assets (liabilities)	$	7.4		$	—		$	—	$	7.4
Net derivative assets	$	7.4		$	—		$	—	$	7.4
December 31, 2015
Total derivative assets	$	—		$	—		$	—	$	—
Total derivative liabilities	(27.9		)	—			—		(27.9		)
Net assets (liabilities)	$	(27.9	)	$	—		$	—	$	(27.9	)

_______________________________________________________________________________

(1) We report the fair values of our derivative assets and liabilities on a gross basis onin our consolidated balance sheets. As a result, the gross amounts recognized and net amounts presented herein are the same.

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8. Fair Value Measurements

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents assets and liabilities included in our consolidated balance sheets that are recognized at fair value on a recurring basis, and indicates the fair value hierarchy utilized to determine such fair value as of December 31, ~~2016~~2017 and ~~2015~~2016:

	Balances as of December 31, 2016
	Balances as of December 31, 2017
	Total			Quoted MarketPrices in ActiveMarkets(Level 1)		Significant OtherObservableInputs(Level 2)			Significant Unobservable Inputs (Level 3)
	(in millions)
Cash equivalents	$	3280.05		$	3280.05	$	—		$	—
Unrealized gains on natural gas derivatives	9.0			—		9.0			—
Total assets at fair value	$	80.5		$	80.5	$	—		$	—
Total assets at fair value	$	41.0		$	32.0	$	9.0		$	—
Unrealized losses on natural gas derivatives	$	(3.2	)	$	—	$	(3.2	)	$	—
Unrealized losses on natural gas derivatives	(1.6		)	—		(1.6		)	—
Total liabilities at fair value	$	(3.2	)	$	—	$	(3.2	)	$	—
Total liabilities at fair value	$	(1.6	)	$	—	$	(1.6	)	$	—

	Balances as of December 31, 2015
	Balances as of December 31, 2016
	Total			Quoted MarketPrices in ActiveMarkets(Level 1)		Significant OtherObservableInputs(Level 2)			SignificantUnobservableInputs(Level 3)
	(in millions)
Cash equivalents	$	9532.90		$	9532.90	$	—		$	—
Total assets at fair value	$	95.9		$	95.9	$	—		$	—
Unrealized gains on natural gas derivatives	9.0			—		9.0			—
Unrealized losses on natural gas derivatives	$	(27.9	)	$	—	$	(27.9	)	$	—
Total assets at fair value	$	41.0		$	32.0	$	9.0		$	—
Total liabilities at fair value	$	(27.9	)	$	—	$	(27.9	)	$	—
Unrealized losses on natural gas derivatives	$	(1.6	)	$	—	$	(1.6	)	$	—
Total liabilities at fair value	$	(1.6	)	$	—	$	(1.6	)	$	—

Cash Equivalents

As of December 31, ~~2016~~2017 and ~~2015~~2016, our cash equivalents consisted primarily of money market mutual funds that invest in U.S. treasuries and direct investments in U.S. treasuries with original maturities of three months or less.

Natural Gas Derivatives

The derivative instruments that we use are primarily natural gas fixed price swaps and options traded in the OTC markets with ~~multi-national~~multinational commercial banks, other major financial institutions and large energy companies. The derivatives are traded in months forward and settlements are scheduled to coincide with anticipated gas purchases during those future periods. These contracts settle using NYMEX futures prices and accordingly, to determine the fair value of these instruments, we use quoted market prices from NYMEX and standard pricing models with inputs derived from or corroborated by observable market data such as forward curves supplied by an industry-recognized unrelated third party. See Note 7—Derivative Financial Instruments for additional information.

Assets Measured at Fair Value on a Nonrecurring Basis

We also have assets that may be measured at fair value on a nonrecurring basis; that is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances, such as when there is evidence of impairment. These include long-lived assets that may be written down to fair value as a result of impairment. We determined that these fair value measurements would rely primarily on Partnership-specific inputs and the Partnership's assumptions about the use of the assets. Since certain of the assumptions would involve inputs that are not observable, these fair values would reside within Level 3 of the fair value hierarchy.

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9. Property, Plant and Equipment—Net

Property, plant and equipment—net consisted of the following:

	December 31,
	2016		2015
	2017		2016
	(in millions)
Land	$	1.4	$	1.64
Buildings and improvements	16.79		1416.57
Machinery and equipment	~~562~~568.3		~~537~~562.53
Construction in progress	2141.91		1821.9
Property, plant and equipment	~~602~~627.37		~~572~~602.53
Less: Accumulated depreciation and amortization	~~301~~337.05		~~265~~301.50
Property, plant and equipment—net	$	~~301~~290.32	$	~~307~~301.03

~~Additions to property~~Property, plant and equipment ~~included~~used into ~~our~~produce ~~consolidated~~nitrogen ~~statements~~fertilizer ofproducts ~~cash~~are ~~flows~~subject ~~represents~~to ~~cash~~the ~~outflows~~Services ~~for~~and ~~capital~~Offtake ~~expenditures;~~Agreement ~~therefore,~~with itan ~~does~~affiliate ~~not~~of ~~include~~ the ~~net~~General ~~increase (decrease) in amounts accrued for capital expenditures~~Partner, which ~~were~~is ~~$1.8~~accounted ~~million,~~for ~~$(2.2)~~as ~~million~~an ~~and~~operating $1lease.3 ~~million~~See ~~for the years ended December~~Note ~~31,~~10—Related ~~2016,~~Party ~~2015~~Transactions ~~and~~for ~~2014~~additional information.

~~Losses~~Additions onto ~~the~~property, ~~disposal~~plant and equipment included in our consolidated statements of ~~certain~~cash ~~machinery~~flows ~~and~~represents ~~equipment~~cash outflows for capital expenditures; therefore, it does not include the net increase (decrease) in amounts accrued for capital expenditures, which were $0.16 million, $21.08 million and ~~zero~~$(2.2) million for the years ended December 31, ~~2016~~2017, ~~2015~~2016 and ~~2014~~2015, respectively~~, and are included in other general and administrative expenses on our consolidated statements of operations~~.

	Year ended December 31,
	2016			2015			2014
	(in millions)
Net capitalized turnaround costs:
Beginning balance	$	37.8		$	16.7		$	22.7
Additions	4.9			33.6			0.3
Depreciation	(16.1		)	(12.5		)	(6.3		)
Ending balance	$	26.6		$	37.8		$	16.7

Losses on the disposal of certain machinery and equipment were zero, $0.1 million and $2.0 million for the years ended December 31, 2017, 2016 and 2015, respectively, and are included in other general and administrative expenses in our consolidated statements of operations.

Plant turnarounds—Scheduled inspections, replacements and overhauls of machinery and equipment at our continuous process manufacturing facility are referred to as plant turnarounds. The expenditures related to turnarounds are capitalized in property, plant and equipment when incurred. The following is a summary of capitalized plant turnaround costs:

Scheduled replacements and overhauls of plant and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalyst when a full plant shutdown occurs. Scheduled inspections are also conducted during full plant shutdowns, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Internal employee costs and overhead are not considered turnaround costs and are not capitalized.



	Year ended December 31,
	2017			2016			2015
	(in millions)
Net capitalized turnaround costs:
Beginning balance	$	26.6		$	37.8		$	16.7
Additions	2.3			4.9			33.6
Depreciation	(14.2		)	(16.1		)	(12.5		)
Ending balance	$	14.7		$	26.6		$	37.8

48Scheduled replacements and overhauls of machinery and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalyst when a full plant shutdown occurs. Scheduled inspections are also conducted during full plant shutdowns, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Internal employee costs and overhead are not considered turnaround costs and are not capitalized.

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10. Related Party Transactions

TNCLP and TNGP have no employees. We have entered into several agreements with asubsidiaries ~~subsidiary~~ of CF Industries relating to the operation of our business and the sale of the fertilizer products produced at our Verdigris facility. We believe that each of these agreements is on terms that are fair and reasonable to us.

~~Services~~Product ~~and Offtake Agreement~~Sales

Pursuant to the Services and Offtake Agreement, which is accounted for as an operating lease, the Partnership sells all of its fertilizer products to affiliates of the General Partner at prices based on market prices for the Partnership's nitrogen fertilizer products. asAlso, ~~defined~~pursuant into the Services and Offtake Agreement, selling prices are determined monthly and are equal to the volume weighted average net invoice price for third party sales (that is, sales by the affiliates of the General Partner to their customers) of product during each month. These selling prices are reduced by any freight or other transportation charges and incentives paid by the affiliates of the General Partner. Title and risk of loss transfer to affiliates of the General Partner as the product is shipped from the plant gate. The Services and Offtake Agreement was effective initially for a one-year term and is extended automatically for successive one-year terms unless terminated by one of the parties prior to renewal. The Services and Offtake Agreement is accounted for as an operating lease comprised entirely of variable lease payments associated with the sale of our products.

Directly Incurred Charges

Since we have no employees, we rely on employees from an affiliate of the General Partner to operate our Verdigris facility. As a result, the payroll, payroll-related expenses and benefit costs, such as health insurance and pension costs, are incurred by an affiliate of the General Partner and directly charged to us. Payroll, payroll-related expenses and other employee-related benefit costs directly charged to us were $27.9 million for each of the years ended December 31, ~~2016~~2017, ~~2015~~2016 and ~~2014 were $27~~2015.9 ~~million, $27.9 million and $24.0 million, respectively.~~ We report these expenses as services provided by affiliates of the General Partner in cost of goods sold in our consolidated statements of operations.

Allocated Charges

CF Industries, together with its affiliates, also provides certain services to us under the Services and Offtake Agreement. These services include production planning, manufacturing management, logistics, procurement, accounting, legal, risk management, investor relations and other general and administrative functions. Allocated expenses charged to us ~~for~~in each of the years ended December 31, ~~2016~~2017, ~~2015~~2016 and ~~2014~~2015 were $15.79 million, $15.7 million and $15.67 million, respectively. We report these expenses as selling, general and administrative services provided by affiliates of the General Partner in our consolidated statements of operations.

Amounts Due to/from Affiliates of the General Partner

We receive cash and make expenditures directly from our cash accounts. Because we sell our products to and receive ~~payroll~~labor and other ~~related~~ services from affiliates of the General Partner, the affiliates of the General Partner continue to be both debtors and creditors to us. As of December 31, ~~2016~~2017 and ~~2015~~2016, we had a net balance due from (to)~~/from~~ affiliates of the General Partner of $(012.1)9 million and $5(0.91) million, respectively.

Spare Parts Sharing Agreement

Affiliates of CF Industries own and operate nitrogen fertilizer complexes that utilize some equipment that is similar to equipment at our Verdigris nitrogen complex. Each of the various manufacturing complexes maintains spare parts for use in its facilities. In the event that an unplanned need arises and to help minimize manufacturing downtime, we have entered into a spare parts sharing agreement with affiliates of CF Industries that permits spare parts to be shared among the manufacturing complexes from time to time. Parts that are borrowed from another complex under the agreement are either refurbished and returned to the lender or replaced.

Other Leases

We entered into an amended and restated lease with an affiliate of the General Partner under which the ammonia assets in our terminal in Blair, Nebraska are leased by the affiliate. The lease is effective for a five-year term ending on December 31, 2018, and the affiliate of the General Partner has options to renew for three additional five-year terms. The quarterly lease payment is $100,000, subject to an annual inflation adjustment, and additional rent will be paid equal to all costs, expenses, and obligations incurred by the affiliate of the General Partner related to the use, occupancy and operation of the terminal.

We also have leased certain of our rail cars to an affiliate of the General Partner for quarterly rental payments of $3,600 per car. This lease was effective initially for a one-year term and is extended automatically for successive one-year terms unless terminated by either party thereto prior to renewal.52

We recognized rental income related to the above lease agreements for the years ended December 31, 2016, 2015 and 2014 of $0.6 million, which is reflected in other income from an affiliate of the General Partner in our consolidated statements of operations.

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In each of the years ended December 31, 2017, 2016 and 2015, we recognized rental income of $0.6 million. We report this income as other income from an affiliate of the General Partner in our consolidated statements of operations.

11. Asset Retirement Obligations

Asset retirement obligations (AROs) are legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development or normal operation of such assets. AROs are initially recognized as incurred when sufficient information exists to estimate fair value. We have unrecorded AROs at our Verdigris facility that are conditional upon cessation of operations. These AROs include certain decommissioning and pond closure activities, and the removal and disposal of certain chemicals, waste materials, structures, equipment, vessels, piping and storage tanks. The most recent estimate of the aggregate cost of these AROs expressed in ~~2016~~2017 dollars is $4.10 million. We have not recorded a liability for these conditional AROs as of December 31, ~~2016~~2017 because we do not believe there is currently a reasonable basis for estimating a date or range of dates of cessation of operations at this facility, which is necessary in order to estimate fair value. In reaching this conclusion, we considered the historical performance of the facility and have taken into account factors such as planned maintenance, asset replacements and upgrades of plant and equipment, which if conducted as in the past, can extend the physical lives of the facility indefinitely., Weas ~~also~~well ~~considered~~as the possibility of changes in technology, risk of obsolescence, and availability of raw materials in arriving at our conclusion.

12. Commitments

The Operating Partnership is committed to various non-cancelable operating leases for land, buildings and equipment. Total minimum rental payments for operating leases are insignificant for ~~2017~~2018 and all subsequent years.

Rent expense under non-cancelable operating leases for the years ended December 31, ~~2016~~2017, ~~2015~~2016 and ~~2014~~2015 was insignificant.

As of December 31, 2016, we had commitments of approximately $26.3 million related to firm quantities of gas and open purchase orders. The natural gas commitments are based on a firm quantity of natural gas at market prices. These natural gas commitments are priced at the beginning of the month of the scheduled activity. We have the option to receive and use the natural gas in our manufacturing operations or we can sell the committed natural gas at current market prices, which may be different than the price that we pay for the natural gas.

13. Quarterly Financial Data (Unaudited)

Summarized quarterly financial data are as follows:

	FirstQuarter		SecondQuarter		ThirdQuarter		FourthQuarter		Full Year
	(in millions, except per unit amounts)
2017
Net sales	$	119.0	$	96.1	$	84.6	$	97.5	$	397.2
Gross margin	46.6		43.5		27.2		39.4		156.7
Net earnings (1)	42.2		39.5		22.8		49.4		153.9
Net earnings per Common Unit (1) (2)	2.10		1.48		0.92		1.44		5.93
2016
Net sales	$	108.0	$	126.7	$	90.2	$	93.4	$	418.3
Gross margin	43.1		102.7		32.8		48.2		226.8
Net earnings	37.7		98.7		28.8		44.1		209.3
Net earnings per Common Unit(1)	1.44		3.22		1.04		1.85		7.56
Net earnings per Common Unit (2)	1.44		3.22		1.04		1.85		7.56
2015
Net sales	$	126.6	$	153.6	$	150.2	$	151.3	$	581.7
Gross margin	65.0		103.7		74.1		83.0		325.8
Net earnings	59.0		99.3		69.4		79.2		306.9
Net earnings per Common Unit(1)	2.03		3.31		2.23		2.49		10.06

(1) The ~~sum~~fourth quarter of ~~the~~2017 ~~four~~includes ~~quarters~~a isgain ~~not~~of ~~necessarily~~$14.3 million for the ~~same~~sale asof ~~the~~our ~~total~~50% ~~for~~joint ~~the~~venture ~~year~~interest in Oklahoma CO2 Partnership (OKCO2). See Note 14—Sale of Equity Method Investment.

50(2) The sum of the four quarters is not necessarily the same as the total for the year.

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14. Sale of Equity Method Investment

On October 2, 2017, we sold our 50% interest in OKCO2, a joint venture that owns a carbon dioxide liquefaction and purification facility, to the joint venture partner. Prior to the sale, we had accounted for this interest as an equity method investment. We received proceeds of $16.3 million for the sale and recorded a gain of $14.3 million after the completion of certain customary closing and working capital adjustments in the fourth quarter of 2017. The proceeds were included in the determination of Available Cash for the fourth quarter of 2017.

15. Subsequent Event

As of April 2, 2018, all rights of the holders of the Public Units will cease, except for the right to receive payment of the purchase price. Upon completion of the purchase on April 2, 2018, TNGP will own 100 percent of the Public Units and will be entitled to all of the benefits resulting from the Public Units. As a result of TNGP’s exercise of the right to purchase the Public Units, there will be no further cash distributions on the common units after the distribution payable February 28, 2018.

In addition, upon completion of the purchase, the common units representing limited partner interests in TNCLP will cease to be publicly traded or listed on the NYSE.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.

None.

ITEM 9A. CONTROLS AND PROCEDURES.

(a) Disclosure Controls and Procedures. TNGP's management, with the participation of TNGP's Principal Executive Officer and Principal Financial Officer, has evaluated the effectiveness of the Partnership's disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act)) as of the end of the period covered by this report. Based on such evaluation, TNGP's Principal Executive Officer and Principal Financial Officer have concluded that, as of the end of such period, the Partnership's disclosure controls and procedures are effective in (i) ensuring that information required to be disclosed by the Partnership in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC's rules and forms and (ii) ensuring that information required to be disclosed by the Partnership in the reports that it files or submits under the Exchange Act is accumulated and communicated to TNGP's management, including TNGP's Principal Executive Officer and Principal Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

(b) Management's Report on Internal Control over Financial Reporting.

~~Management~~TNGP's ~~Report~~management onis responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act, for the Partnership. Under the supervision and with the participation of TNGP's senior management, including TNGP's Principal Executive Officer and Principal Financial Officer, we assessed the effectiveness of our internal control over financial reporting as of December 31, 2017, using the criteria set forth in the Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, management has concluded that our internal control over ~~Financial~~financial ~~Reporting~~reporting is effective as of December 31, 2017. KPMG LLP, the independent registered public accounting firm that audited the Partnership's consolidated financial statements, has issued an attestation report on the Partnership's internal control over financial reporting as of December 31, 2017, a copy of which appears on the following page.

~~TNGP's~~(c) Changes ~~management~~in isInternal ~~responsible~~Control ~~for~~over ~~establishing~~Financial ~~and~~Reporting. There ~~maintaining~~have ~~adequate~~not been any changes in the Partnership's internal control over financial reporting, (as such term is defined in Rules 13a-15(f) and 15d-15(f) ofunder the Exchange Act,) ~~for~~during the ~~Partnership.~~quarter ~~Under~~ended the supervision and with the participation of TNGP's senior management, including TNGP's Principal Executive Officer and Principal Financial Officer, we assessed the effectiveness of our internal control over financial reporting as of December 31, ~~2016,~~2017 using the criteria set forth in the Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, management has concluded that ~~our~~have ~~internal~~materially ~~control over financial reporting is effective as of December 31~~affected, ~~2016.~~or ~~KPMG LLP,~~are ~~the~~reasonably ~~independent~~likely ~~registered~~to ~~public~~materially ~~accounting firm that audited the Partnership's consolidated financial statements~~affect, ~~has issued an attestation report on~~ the Partnership's internal control over financial reporting ~~as of December 31, 2016, a copy of which appears on the following page~~.

(c) Changes in Internal Control over Financial Reporting. There have not been any changes in the Partnership's internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended December 31, 2016 that have materially affected, or are reasonably likely to materially affect, the Partnership's internal control over financial reporting.

ITEM 9B. OTHER INFORMATION.

None.

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TERRA NITROGEN COMPANY, L.P.

Report of Independent Registered Public Accounting Firm

The Partners ofand ~~Terra~~Common ~~Nitrogen~~Unit ~~Company, L.P.:~~Holders

~~We have audited~~ Terra Nitrogen Company, L.P.'s (a Limited Partnership) (the Partnership) internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Partnership's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Partnership's internal control over financial reporting based on our audit.:

WeOpinion conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on ~~the~~Internal ~~assessed~~Control ~~risk.~~Over ~~Our~~Financial ~~audit~~Reporting ~~also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.~~

AWe ~~company's~~have ~~internal~~audited ~~control~~Terra ~~over~~Nitrogen ~~financial~~Company, ~~reporting~~L.P.’s is (a ~~process~~Limited ~~designed~~Partnership) ~~to provide reasonable assurance regarding~~ (the ~~reliability~~Partnership) ~~of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's~~ internal control over financial reporting ~~includes~~as ~~those~~of ~~policies and procedures that (1)~~December ~~pertain~~31, to2017, ~~the~~based ~~maintenance~~on ofcriteria ~~records~~established ~~that,~~ in ~~reasonable~~Internal ~~detail,~~Control—Integrated ~~accurately~~Framework ~~and~~(2013) ~~fairly~~issued ~~reflect~~by the ~~transactions~~Committee ~~and dispositions~~ of ~~the~~Sponsoring ~~assets~~Organizations of the ~~company;~~Treadway ~~(2) provide~~Commission. ~~reasonable~~In ~~assurance~~our ~~that~~opinion, ~~transactions~~the ~~are~~Partnership ~~recorded~~maintained, ~~as necessary to permit preparation of financial statements~~ in ~~accordance~~all ~~with~~material ~~generally~~respects, ~~accepted~~effective ~~accounting~~internal ~~principles,~~control ~~and~~over ~~that~~financial ~~receipts~~reporting ~~and~~as ~~expenditures~~ of ~~the~~December 31, ~~company~~2017, ~~are~~based ~~being~~on ~~made~~criteria ~~only~~established in ~~accordance~~Internal ~~with~~Control—Integrated ~~authorizations~~Framework ~~of management and directors of the company; and~~ (32013) ~~provide~~ ~~reasonable~~issued ~~assurance~~by ~~regarding~~the ~~prevention~~Committee ~~or timely detection~~ of ~~unauthorized~~Sponsoring ~~acquisition,~~Organizations ~~use, or disposition~~ of the ~~company's~~Treadway ~~assets that could have a material effect on the financial statements~~Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Partnership as of December 31, 2017 and 2016, the related consolidated statements of operations, partners’ capital, and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes (collectively, the consolidated financial statements), and our report dated February 22, 2018 expressed an unqualified opinion on those consolidated financial statements.

Basis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Terra Nitrogen Company, L.P. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Terra Nitrogen Company, L.P. and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of operations, partners' capital, and cash flows for each of the years in the three-year period ended December 31, 2016, and our report dated February 23, 2017 expressed an unqualified opinion on those consolidated financial statements.

/s/ KPMG LLP

Chicago, Illinois

February 2322, ~~2017~~ 2018

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TERRA NITROGEN COMPANY, L.P.

Part III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE.

The General Partner acts as the manager of TNCLP and the Operating Partnership. Unitholders do not direct or participate in the management or control of either TNCLP or the Operating Partnership. The General Partner does not intend to establish an advisory board or similar body to which the unitholders would be entitled to elect representatives.

We have no directors or executive officers. Set forth below is certain information concerning the directors and executive officers of TNGP, the General Partner. The ages of the directors and executive officers are as of February 1615, ~~2017~~2018. The sole stockholder of the General Partner elects the directors of the General Partner. All directors hold office until their successors are duly elected and qualified or their resignation or removal. All officers of the General Partner serve at the discretion of the directors.

The TNGP Board of Directors independence determination described below under the headings "Audit Committee" and "Nominating and Corporate Governance Committee" and "Corporate Governance Matters" was based on information provided by the General Partner's directors and discussions among the General Partner's officers and directors. The Nominating and Corporate Governance Committee of the Board of Directors of the General Partner reviews and designates director-nominees in accordance with the policies and principles of its charter and the General Partner's Corporate Governance Guidelines.

Directors
Coleman L. Bailey(age 66)		Mr. Bailey has been a director of TNGP (or its predecessor) since July 2005. He was Chairman of the Board of Mississippi Chemical Corporation from 1988 to 2004 and Chief Executive Officer of Mississippi Chemical Corporation in 2004. The TNGP Board of Directors selected Mr. Bailey as a director, among other reasons, because of the extensive industry experience he gained while serving as the Chief Executive Officer and Chairman of the Board of Directors of Mississippi Chemical Corporation, a company which was acquired by Terra in 2004, and because of his extensive agricultural industry experience.
Coleman L. Bailey(age 67)		Mr. Bailey has been a director of TNGP (or its predecessor) since July 2005. He was Chairman of the Board of Mississippi Chemical Corporation from 1988 to 2004 and Chief Executive Officer of Mississippi Chemical Corporation in 2004. The TNGP Board of Directors selected Mr. Bailey as a director, among other reasons, because of the extensive industry experience he gained while serving as the Chief Executive Officer and Chairman of the Board of Directors of Mississippi Chemical Corporation, a company which was acquired by Terra in 2004, and because of his extensive agricultural industry experience.
Douglas C. Barnard(age 58)		Mr. Barnard has been a director of TNGP since June 2010 and Chairman of the TNGP Board of Directors since February 2016. He has served as CF Industries' Senior Vice President, General Counsel and Secretary since January 2012 and was previously CF Industries' Vice President, General Counsel, and Secretary from January 2004 to December 2011. Prior to joining CF Industries in January 2004, Mr. Barnard had been an Executive Vice President and General Counsel of Bcom3 Group, Inc., an advertising and marketing communication services group. Earlier in his career, Mr. Barnard was a partner in the law firm of Kirkland & Ellis LLP and, prior to that, a Vice President, General Counsel, and Secretary of LifeStyle Furnishings International Ltd., a manufacturer and distributor of residential furniture and decorative fabrics. He holds a B.S. degree from the Massachusetts Institute of Technology ("M.I.T."), a J.D. degree from the University of Minnesota, and an M.B.A. degree from the University of Chicago. Mr. Barnard is also a lecturer at the University of Chicago Law School and a member of the M.I.T. Corporation Development Committee. The TNGP Board of Directors selected Mr. Barnard as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry, his extensive legal and corporate governance experience, and his expertise with public company reporting.
Douglas C. Barnard(age 59)		Mr. Barnard has been a director of TNGP since June 2010 and Chairman of the TNGP Board of Directors since February 2016. He has served as CF Industries' Senior Vice President, General Counsel and Secretary since January 2012 and was previously CF Industries' Vice President, General Counsel, and Secretary from January 2004 to December 2011. Prior to joining CF Industries in January 2004, Mr. Barnard had been an Executive Vice President and General Counsel of Bcom3 Group, Inc., an advertising and marketing communication services group. Earlier in his career, Mr. Barnard was a partner in the law firm of Kirkland & Ellis LLP and, prior to that, a Vice President, General Counsel, and Secretary of LifeStyle Furnishings International Ltd., a manufacturer and distributor of residential furniture and decorative fabrics. Mr. Barnard has also taught as a lecturer at the University of Chicago Law School, and serves as a member of the Massachusetts Institute of Technology (M.I.T.) Corporation Development Committee. The TNGP Board of Directors selected Mr. Barnard as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry, his extensive legal and corporate governance experience, and his expertise with public company reporting.
Christopher D. Bohn(age 49)		Mr. Bohn has been a director of TNGP since February 2016. He has served as CF Industries' Senior Vice President, Manufacturing and Distribution, since May 2016 and was previously CF Industries' Senior Vice President, Manufacturing, from January 2016 to May 2016, Senior Vice President, Supply Chain, from January 2015 to December 2015, Vice President, Supply Chain, from January 2014 to December 2014, Vice President, Corporate Planning, from October 2010 to January 2014 and Director, Corporate Planning and Analysis, from September 2009 to October 2010. Prior to joining CF Industries, Mr. Bohn served as Chief Financial Officer for Hess Print Solutions from August 2007 to September 2009. Earlier in his career, Mr. Bohn was Vice President, Global Financial Planning and Analysis, for Merisant Worldwide, Inc. He holds a B.S. degree in finance from Indiana University and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University. The TNGP Board of Directors selected Mr. Bohn as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry, his extensive financial expertise and his experience as an executive overseeing manufacturing operations.
Christopher D. Bohn(age 50)		Mr. Bohn has been a director of TNGP since February 2016. He has served as CF Industries' Senior Vice President, Manufacturing and Distribution, since May 2016 and was previously CF Industries' Senior Vice President, Manufacturing, from January 2016 to May 2016, Senior Vice President, Supply Chain, from January 2015 to December 2015, Vice President, Supply Chain, from January 2014 to December 2014, Vice President, Corporate Planning, from October 2010 to January 2014 and Director, Corporate Planning and Analysis, from September 2009 to October 2010. Prior to joining CF Industries, Mr. Bohn served as Chief Financial Officer for Hess Print Solutions from August 2007 to September 2009. Earlier in his career, Mr. Bohn was Vice President, Global Financial Planning and Analysis, for Merisant Worldwide, Inc. The TNGP Board of Directors selected Mr. Bohn as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry, his extensive financial expertise and his experience as an executive overseeing manufacturing operations.

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Richard A. Hoker(age 52)		Mr. Hoker has been a director of TNGP since January 2014. He previously served as a director of TNGP from September 2010 until August 2011. Mr. Hoker has served as CF Industries' Vice President and Corporate Controller since November 2007. Before joining CF Industries, Mr. Hoker spent over 11 years with Sara Lee Corporation, where he served most recently as Vice President and Controller from January 2007 to November 2007 and Principal Accounting Officer from July 2007 to November 2007. Prior to being named Controller, Mr. Hoker held other financial management positions of increasing responsibility at Sara Lee. Prior to joining Sara Lee, Mr. Hoker was a member of the financial advisory services consulting group at Coopers & Lybrand LLP in Chicago (now PricewaterhouseCoopers) and previously led teams in the firm's audit practice. Mr. Hoker holds a B.S. degree in accounting from DePaul University and an M.B.A. degree in finance and accounting from the University of Chicago. He is also a certified public accountant. The TNGP Board of Directors selected Mr. Hoker as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry, his expertise with public company financial reporting and his extensive financial and accounting expertise.
Richard A. Hoker(age 53)		Mr. Hoker has been a director of TNGP since January 2014. He previously served as a director of TNGP from September 2010 until August 2011. Mr. Hoker has served as CF Industries' Vice President and Corporate Controller since November 2007. Before joining CF Industries, Mr. Hoker spent over 11 years with Sara Lee Corporation, where he served most recently as Vice President and Controller from January 2007 to November 2007 and Principal Accounting Officer from July 2007 to November 2007. Prior to being named Controller, Mr. Hoker held other financial management positions of increasing responsibility at Sara Lee. Prior to joining Sara Lee, Mr. Hoker was a member of the financial advisory services consulting group at Coopers & Lybrand LLP in Chicago (now PricewaterhouseCoopers) and previously led teams in the firm's audit practice. He is also a certified public accountant. The TNGP Board of Directors selected Mr. Hoker as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry, his expertise with public company financial reporting and his extensive financial and accounting expertise.
Dennis P. Kelleher(age 52)		Mr. Kelleher has been a director of TNGP since August 2011. He has served as CF Industries' Senior Vice President and Chief Financial Officer since August 2011. Before joining CF Industries, Mr. Kelleher served as Vice President, Portfolio Strategy for BP PLC's upstream business. From 2007 to 2010, Mr. Kelleher served as Chief Financial Officer for Pan American Energy LLC. From 2005 to 2007, Mr. Kelleher served as Vice President, Planning and Performance Management for BP PLC's upstream business. Mr. Kelleher was employed as a senior accountant at Arthur Andersen & Co. early in his career. He holds a B.S. degree in accountancy from the University of Illinois and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University. He is a certified public accountant. The TNGP Board of Directors selected Mr. Kelleher as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry and his extensive financial and accounting expertise.
Dennis P. Kelleher(age 53)		Mr. Kelleher has been a director of TNGP since August 2011. He has served as CF Industries' Senior Vice President and Chief Financial Officer since August 2011. Before joining CF Industries, Mr. Kelleher served as Vice President, Portfolio Strategy for BP PLC's upstream business. From 2007 to 2010, Mr. Kelleher served as Chief Financial Officer for Pan American Energy LLC. From 2005 to 2007, Mr. Kelleher served as Vice President, Planning and Performance Management for BP PLC's upstream business. Mr. Kelleher was employed as a senior accountant at Arthur Andersen & Co. early in his career. He is a certified public accountant. The TNGP Board of Directors selected Mr. Kelleher as a director, among other reasons, because of his knowledge of the nitrogen fertilizer industry and his extensive financial and accounting expertise.
Michael A. Jackson(age 62)		Mr. Jackson has been a director of TNGP (or its predecessor) since February 2002. Mr. Jackson founded Jackson & Associates Consulting, LLC in October 2014 and serves as its Chief Executive Officer. Jackson & Associates provides strategic and marketing services to its agribusiness and life sciences clients. Prior to founding Jackson & Associates, Mr. Jackson served as Chief Marketing and Strategy Officer of Trupointe Cooperative from September 2011 to October 2014. Previously, Mr. Jackson served as the Chief Executive Officer and President of Adayana, Inc. from April 2008 to May 2011 and served as Chief Operating Officer of Adayana, Inc. from February 2006 to April 2008. Mr. Jackson was Chief Executive Officer and President of Agri Business Group, Inc., which he founded in 1979, until its merger with Adayana, Inc. in October 2005. The TNGP Board of Directors selected Mr. Jackson as a director, among other reasons, because of his extensive knowledge of and experience in the agricultural industry, gained while serving as the Chief Marketing and Strategy Officer of Trupointe Cooperative and as President and Chief Executive Officer of Agri Business Group, Inc. and Adayana, Inc. Mr. Jackson is also a director of Renewable Energy Group, Inc.
Michael A. Jackson(age 63)		Mr. Jackson has been a director of TNGP (or its predecessor) since February 2002. Mr. Jackson founded Jackson & Associates Consulting, LLC in October 2014 and serves as its Chief Executive Officer. Jackson & Associates provides strategic and marketing services to its agribusiness and life sciences clients. Prior to founding Jackson & Associates, Mr. Jackson served as Chief Marketing and Strategy Officer of Trupointe Cooperative from September 2011 to October 2014. Previously, Mr. Jackson served as the Chief Executive Officer and President of Adayana, Inc. from April 2008 to May 2011 and served as Chief Operating Officer of Adayana, Inc. from February 2006 to April 2008. Mr. Jackson was Chief Executive Officer and President of Agri Business Group, Inc., which he founded in 1979, until its merger with Adayana, Inc. in October 2005. The TNGP Board of Directors selected Mr. Jackson as a director, among other reasons, because of his extensive knowledge of and experience in the agricultural industry, gained while serving as the Chief Marketing and Strategy Officer of Trupointe Cooperative and as President and Chief Executive Officer of Agri Business Group, Inc. and Adayana, Inc. Mr. Jackson is also a director of Renewable Energy Group, Inc.
Anne H. Lloyd(age 55)		Ms. Lloyd has been a director of TNGP since May 2009. She has been Executive Vice President, Chief Financial Officer of Martin Marietta Materials, Inc. since May 2013; Executive Vice President, Chief Financial Officer and Treasurer from 2009 to 2013; Senior Vice President, Chief Financial Officer and Treasurer from 2006 to 2009; Senior Vice President and Chief Financial Officer from 2005 to 2006; Chief Accounting Officer from 1999 to 2005; and Vice President and Controller from 1998 to 1999. The TNGP Board of Directors selected Ms. Lloyd as a director, among other reasons, because of her significant experience gained in a variety of positions with a public company, particularly her expertise with public company financial reporting, enabling her to qualify as an "audit committee financial expert" as that term has been defined by the Securities and Exchange Commission (SEC).
Anne H. Lloyd(age 56)		Ms. Lloyd has been a director of TNGP since May 2009. She served as Executive Vice President, Chief Financial Officer of Martin Marietta Materials, Inc. from 2013 to 2017; Executive Vice President, Chief Financial Officer and Treasurer from 2009 to 2013; Senior Vice President, Chief Financial Officer and Treasurer from 2006 to 2009; Senior Vice President and Chief Financial Officer from 2005 to 2006; Chief Accounting Officer from 1999 to 2005; and Vice President and Controller from 1998 to 1999. The TNGP Board of Directors selected Ms. Lloyd as a director, among other reasons, because of her significant experience gained in a variety of positions with a public company, particularly her expertise with public company financial reporting, enabling her to qualify as an "audit committee financial expert" as that term has been defined by the Securities and Exchange Commission (SEC). Ms. Lloyd is also a director of Highwoods Properties, Inc.

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Executive Officers
W. Anthony Will(age 51)		Mr. Will has been President and Chief Executive Officer of TNGP since January 2014. He has served as President and Chief Executive Officer and a director of CF Industries since January 2014. Mr. Will served as a director of TNGP from June 2010 until February 2016 and as Chairman of the TNGP Board of Directors from January 2014 to February 2016. Mr. Will was previously Senior Vice President, Manufacturing and Distribution of TNGP, from January 2012 to January 2014, and Vice President, Manufacturing and Distribution of TNGP from April 2010 to January 2012. He was previously CF Industries' Senior Vice President, Manufacturing and Distribution, from January 2012 to January 2014, CF Industries' Vice President, Manufacturing and Distribution, from March 2009 to December 2011 and CF Industries' Vice President, Corporate Development, from April 2007 to March 2009. Before joining CF Industries, Mr. Will was a partner at Accenture Ltd., a global management consulting, technology services, and outsourcing company. Earlier in his career, he held positions as vice president, business development at Sears, Roebuck and Company and vice president, strategy and corporate development at Fort James Corporation. Prior to that, Mr. Will was a manager with the Boston Consulting Group, a global management consulting firm. Mr. Will holds a B.S. degree in electrical engineering from Iowa State University and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University.
W. Anthony Will(age 52)		Mr. Will has been President and Chief Executive Officer of TNGP since January 2014. He has served as President and Chief Executive Officer and a director of CF Industries since January 2014. Mr. Will served as a director of TNGP from June 2010 until February 2016 and as Chairman of the TNGP Board of Directors from January 2014 to February 2016. Mr. Will was previously Senior Vice President, Manufacturing and Distribution of TNGP, from January 2012 to January 2014, and Vice President, Manufacturing and Distribution of TNGP from April 2010 to January 2012. He was previously CF Industries' Senior Vice President, Manufacturing and Distribution, from January 2012 to January 2014, CF Industries' Vice President, Manufacturing and Distribution, from March 2009 to December 2011 and CF Industries' Vice President, Corporate Development, from April 2007 to March 2009. Before joining CF Industries, Mr. Will was a partner at Accenture Ltd., a global management consulting, technology services, and outsourcing company. Earlier in his career, he held positions as vice president, business development at Sears, Roebuck and Company and vice president, strategy and corporate development at Fort James Corporation. Prior to that, Mr. Will was a manager with the Boston Consulting Group, a global management consulting firm. Mr. Will holds a B.S. degree in electrical engineering from Iowa State University and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University.
Dennis P. Kelleher(age 52)		Mr. Kelleher has been Senior Vice President and Chief Financial Officer of TNGP since August 2011. He has served as Senior Vice President and Chief Financial Officer of CF Industries since August 2011. Before joining CF Industries, Mr. Kelleher served as Vice President, Portfolio Strategy for BP PLC's upstream business. From 2007 to 2010, Mr. Kelleher served as Chief Financial Officer for Pan American Energy LLC. From 2005 to 2007, Mr. Kelleher served as Vice President, Planning and Performance Management for BP PLC's upstream business. Mr. Kelleher was employed as a senior accountant at Arthur Andersen & Co. early in his career. He holds a B.S. degree in accountancy from the University of Illinois and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University. He is a certified public accountant.
Dennis P. Kelleher(age 53)		Mr. Kelleher has been Senior Vice President and Chief Financial Officer of TNGP since August 2011. He has served as Senior Vice President and Chief Financial Officer of CF Industries since August 2011. Before joining CF Industries, Mr. Kelleher served as Vice President, Portfolio Strategy for BP PLC's upstream business. From 2007 to 2010, Mr. Kelleher served as Chief Financial Officer for Pan American Energy LLC. From 2005 to 2007, Mr. Kelleher served as Vice President, Planning and Performance Management for BP PLC's upstream business. Mr. Kelleher was employed as a senior accountant at Arthur Andersen & Co. early in his career. He holds a B.S. degree in accountancy from the University of Illinois and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University. He is a certified public accountant.
Douglas C. Barnard(age 58)		Mr. Barnard has been Senior Vice President, General Counsel, and Secretary of TNGP since January 2012 and was previously Vice President, General Counsel, and Secretary of TNGP from April 2010 to January 2012. He has served as CF Industries' Senior Vice President, General Counsel and Secretary since January 2012 and was previously CF Industries' Vice President, General Counsel, and Secretary from January 2004 to December 2011. Prior to joining CF Industries in January 2004, Mr. Barnard had been an Executive Vice President and General Counsel of Bcom3 Group, Inc., an advertising and marketing communication services group. Earlier in his career, Mr. Barnard was a partner in the law firm of Kirkland & Ellis LLP and, prior to that, was a Vice President, General Counsel, and Secretary of LifeStyle Furnishings International Ltd., a manufacturer and distributor of residential furniture and decorative fabrics. He holds a B.S. degree from M.I.T., a J.D. degree from the University of Minnesota, and an M.B.A. degree from the University of Chicago. Mr. Barnard is also a lecturer at the University of Chicago Law School and a member of the M.I.T. Corporation Development Committee.
Douglas C. Barnard(age 59)		Mr. Barnard has been Senior Vice President, General Counsel, and Secretary of TNGP since January 2012 and was previously Vice President, General Counsel, and Secretary of TNGP from April 2010 to January 2012. He has served as CF Industries' Senior Vice President, General Counsel and Secretary since January 2012 and was previously CF Industries' Vice President, General Counsel, and Secretary from January 2004 to December 2011. Prior to joining CF Industries in January 2004, Mr. Barnard had been an Executive Vice President and General Counsel of Bcom3 Group, Inc., an advertising and marketing communication services group. Earlier in his career, Mr. Barnard was a partner in the law firm of Kirkland & Ellis LLP and, prior to that, was a Vice President, General Counsel, and Secretary of LifeStyle Furnishings International Ltd., a manufacturer and distributor of residential furniture and decorative fabrics. He holds a B.S. degree from M.I.T., a J.D. degree from the University of Minnesota, and an M.B.A. degree from the University of Chicago. Mr. Barnard has also taught as a lecturer at the University of Chicago Law School, and serves as a member of the M.I.T. Corporation Development Committee.
Christopher D. Bohn(age 49)		Mr. Bohn has been Senior Vice President, Manufacturing and Distribution, of TNGP since July 2016 and was previously Senior Vice President, Manufacturing, of TNGP from January 2016 to July 2016, Senior Vice President, Supply Chain, of TNGP from February 2015 to December 2015, Vice President, Supply Chain, of TNGP from January 2014 to February 2015 and Vice President, Corporate Planning, of TNGP from October 2010 to January 2014. He has served as CF Industries' Senior Vice President, Manufacturing and Distribution, since May 2016 and was previously CF Industries' Senior Vice President, Manufacturing, from January 2016 to May 2016, Senior Vice President, Supply Chain, from January 2015 to December 2015, Vice President, Supply Chain, from January 2014 to December 2014,Vice President, Corporate Planning, from October 2010 to January 2014 and Director, Corporate Planning and Analysis, from September 2009 to October 2010. Prior to joining CF Industries, Mr. Bohn served as Chief Financial Officer for Hess Print Solutions from August 2007 to September 2009. Earlier in his career, Mr. Bohn was Vice President, Global Financial Planning and Analysis, for Merisant Worldwide, Inc. He holds a B.S. degree in finance from Indiana University and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University.
Christopher D. Bohn(age 50)		Mr. Bohn has been Senior Vice President, Manufacturing and Distribution, of TNGP since July 2016 and was previously Senior Vice President, Manufacturing, of TNGP from January 2016 to July 2016, Senior Vice President, Supply Chain, of TNGP from February 2015 to December 2015, Vice President, Supply Chain, of TNGP from January 2014 to February 2015 and Vice President, Corporate Planning, of TNGP from October 2010 to January 2014. He has served as CF Industries' Senior Vice President, Manufacturing and Distribution, since May 2016 and was previously CF Industries' Senior Vice President, Manufacturing, from January 2016 to May 2016, Senior Vice President, Supply Chain, from January 2015 to December 2015, Vice President, Supply Chain, from January 2014 to December 2014, Vice President, Corporate Planning, from October 2010 to January 2014 and Director, Corporate Planning and Analysis, from September 2009 to October 2010. Prior to joining CF Industries, Mr. Bohn served as Chief Financial Officer for Hess Print Solutions from August 2007 to September 2009. Earlier in his career, Mr. Bohn was Vice President, Global Financial Planning and Analysis, for Merisant Worldwide, Inc. He holds a B.S. degree in finance from Indiana University and an M.M. degree (M.B.A.) from the Kellogg Graduate School of Management at Northwestern University.

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Bert A. Frost(age 52)		Mr. Frost has been Senior Vice President, Sales, Market Development, and Supply Chain of TNGP since July 2016 and was previously Senior Vice President, Sales, Distribution and Market Development, of TNGP from April 2015 to July 2016, Senior Vice President, Sales and Market Development, of TNGP from January 2012 to April 2015, Vice President, Sales and Market Development, of TNGP from April 2010 to January 2012. He has served as CF Industries' Senior Vice President, Sales, Market Development, and Supply Chain, since May 2016 and was previously CF Industries' Senior Vice President, Sales, Distribution, and Market Development, from May 2014 to May 2016, Senior Vice President, Sales and Market Development, from January 2012 to May 2014 and Vice President, Sales and Market Development from January 2009 to December 2011. Before joining CF Industries in November 2008, Mr. Frost spent over 13 years with Archer Daniels Midland Company, where he served most recently as Managing Director—International Fertilizer/Inputs from June 2008 to November 2008 and Director—Fertilizer, Logistics and Ports Divisions, ADM—Brazil from April 2000 to June 2008. Earlier in his career, Mr. Frost held positions of increasing responsibility at Archer Daniels Midland and Koch Industries, Inc. He holds a B.S. degree from Kansas State University and is a graduate of Harvard Business School's Advance Management Program.
Bert A. Frost(age 53)		Mr. Frost has been Senior Vice President, Sales, Market Development, and Supply Chain of TNGP since July 2016 and was previously Senior Vice President, Sales, Distribution and Market Development, of TNGP from April 2015 to July 2016, Senior Vice President, Sales and Market Development, of TNGP from January 2012 to April 2015, and Vice President, Sales and Market Development, of TNGP from April 2010 to January 2012. He has served as CF Industries' Senior Vice President, Sales, Market Development, and Supply Chain, since May 2016 and was previously CF Industries' Senior Vice President, Sales, Distribution, and Market Development, from May 2014 to May 2016, Senior Vice President, Sales and Market Development, from January 2012 to May 2014, and Vice President, Sales and Market Development from January 2009 to December 2011. Before joining CF Industries in November 2008, Mr. Frost spent over 13 years with Archer Daniels Midland Company, where he served most recently as Managing Director—International Fertilizer/Inputs from June 2008 to November 2008 and Director—Fertilizer, Logistics and Ports Divisions, ADM—Brazil from April 2000 to June 2008. Earlier in his career, Mr. Frost held positions of increasing responsibility at Archer Daniels Midland and Koch Industries, Inc. He holds a B.S. degree from Kansas State University and is a graduate of Harvard Business School's Advance Management Program.
Adam Hall(age 42)		Mr. Hall has been Vice President, Corporate Development, of TNGP since June 2013. He has also served as CF Industries' Vice President, Corporate Development, since June 2013. Before joining CF Industries, Mr. Hall spent 4 years with Bunge Limited, where he served as executive director, corporate strategy and development, from August 2010 to May 2013, where he led global strategy, mergers and acquisitions and the development of new growth initiatives, and director of global strategy and business development, sugar and bioenergy, from August 2009 to August 2010. Prior to his most recent role with Bunge, he worked in a number of countries in positions with several international companies, including, as a manager at Bain & Company, a global management consulting firm, from January 2008 to August 2009, and as a consultant at LEK Consulting, a global strategy consulting firm, from February 1999 to May 2002. Mr. Hall began his career as a corporate attorney with the law firm of Clayton Utz in Perth, Australia. He earned undergraduate degrees in law and commerce from the University of Western Australia and an M.B.A. degree from Harvard Business School.
Adam Hall(age 43)		Mr. Hall has been Vice President, Corporate Development, of TNGP since June 2013. He has also served as CF Industries' Vice President, Corporate Development, since June 2013. Before joining CF Industries, Mr. Hall spent 4 years with Bunge Limited, where he served as executive director, corporate strategy and development, from August 2010 to May 2013, where he led global strategy, mergers and acquisitions and the development of new growth initiatives, and director of global strategy and business development, sugar and bioenergy, from August 2009 to August 2010. Prior to his most recent role with Bunge, he worked in a number of countries in positions with several international companies, including, as a manager at Bain & Company, a global management consulting firm, from January 2008 to August 2009, and as a consultant at LEK Consulting, a global strategy consulting firm, from February 1999 to May 2002. Mr. Hall began his career as a corporate attorney with the law firm of Clayton Utz in Perth, Australia. He earned undergraduate degrees in law and commerce from the University of Western Australia and an M.B.A. degree from Harvard Business School.
Richard A. Hoker(age 52)		Mr. Hoker has been Vice President and Corporate Controller of TNGP since April 2010. He has served as CF Industries' Vice President and Corporate Controller since November 2007. Before joining CF Industries, Mr. Hoker spent over 11 years with Sara Lee Corporation, where he served most recently as Vice President and Controller from January 2007 to November 2007 and Principal Accounting Officer from July 2007 to November 2007. Prior to being named Controller, Mr. Hoker held other financial management positions of increasing responsibility at Sara Lee. Prior to joining Sara Lee, Mr. Hoker was a member of the financial advisory services consulting group at Coopers & Lybrand LLP in Chicago (now PricewaterhouseCoopers) and previously led teams in the firm's audit practice. Mr. Hoker holds a B.S. degree in accounting from DePaul University and an M.B.A. degree in finance and accounting from the University of Chicago. He is also a certified public accountant.
Richard A. Hoker(age 53)		Mr. Hoker has been Vice President and Corporate Controller of TNGP since April 2010. He has served as CF Industries' Vice President and Corporate Controller since November 2007. Before joining CF Industries, Mr. Hoker spent over 11 years with Sara Lee Corporation, where he served most recently as Vice President and Controller from January 2007 to November 2007 and Principal Accounting Officer from July 2007 to November 2007. Prior to being named Controller, Mr. Hoker held other financial management positions of increasing responsibility at Sara Lee. Prior to joining Sara Lee, Mr. Hoker was a member of the financial advisory services consulting group at Coopers & Lybrand LLP in Chicago (now PricewaterhouseCoopers) and previously led teams in the firm's audit practice. Mr. Hoker holds a B.S. degree in accounting from DePaul University and an M.B.A. degree in finance and accounting from the University of Chicago. He is also a certified public accountant.
Wendy S. Jablow (age 54)		Ms. Jablow has been Senior Vice President, Human Resources, of TNGP since January 2012 and was previously Vice President, Human Resources, of TNGP from April 2010 to January 2012. She has served as CF Industries' Senior Vice President, Human Resources, since January 2012 and was previously CF Industries' Vice President, Human Resources, from August 2007 to December 2011. Prior to joining CF Industries, Ms. Jablow served as the Chief Human Resources Officer of Fenwal, Inc., a medical device manufacturer. Earlier in her career, Ms. Jablow spent eight years with Ideal Industries, Inc., an electrical equipment manufacturer and technology design company, where she served as Vice President, Human Resources and Administration. During much of her time at Ideal Industries, Ms. Jablow held a concurrent position as Vice president and General Manager of Ideal Industries' DataComm business unit. Ms. Jablow holds a B.S. in economics from the Wharton School at the University of Pennsylvania and an M.B.A. degree from the University of Michigan. She is also a certified public accountant.
Susan L. Menzel (age 52)		Ms. Menzel has been Senior Vice President, Human Resources, of TNGP since October 2017. She has also served as Senior Vice President, Human Resources of CF Industries since October 2017. Prior to joining CF Industries, Ms. Menzel served as executive vice president, human resources, for CNO Financial Group, Inc. from May 2005 to September 2017. Prior to CNO Financial Group, she served as senior vice president, human resources for APAC Customer Services, Inc., and in roles of increasing responsibility for Sears, Roebuck & Company and Montgomery Ward, Inc. Ms. Menzel holds a bachelor's degree in business administration and economics from Augustana College.

Except for any employment described above with CF Industries, of which TNGP is an indirect, wholly-owned subsidiary, no occupation carried on by any director or executive officer of TNGP during the past five years was carried on with any corporation or organization that is a parent, subsidiary or other affiliate of TNGP. There are no family relationships among any of the directors and any executive officer of TNGP, nor is there any arrangement or understanding between any director, executive officer and any other person pursuant to which that director or executive officer was selected as a director or executive officer of TNGP, as the case may be.

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Meetings of the Board

The TNGP Board of Directors held four regular meetings in ~~2016~~2017. Each director attended 100 percent of the total meetings of the TNGP Board of Directors.

Audit Committee

In ~~2016~~2017, the Audit Committee of the TNGP Board of Directors met five times and each member of the committee attended 100 percent of the meetings of the committee. The Audit Committee is currently composed of Ms. Lloyd (Chairman) and Messrs. ~~Jackson~~Bailey and ~~Bailey~~Jackson. Each audit committee member is a non-employee director and meets the independence requirements as set forth in the New York Stock Exchange (NYSE) listing standards. The Audit Committee has authority to review policies and practices of TNGP dealing with various matters relating to the financial condition and auditing procedures of the Partnership. The TNGP Board of Directors has further determined that Ms. Lloyd meets the requirements to be named "audit committee financial expert" as the term has been defined by the SEC rules implementing Section 407 of the Sarbanes-Oxley Act of 2002. The current Audit Committee Charter was adopted by the TNGP Board of Directors on October 27, 2015, and is reviewed annually by the Audit Committee. A copy of the charter can be viewed on CF Industries' Internet website at www.cfindustries.com by selecting "Investors" and "Terra Nitrogen Investors" and "IR Menu" and "Corporate Profile" and "Governance Documents." The charter is also available in print upon request. All such requests should be made in accordance with directions contained in Item 1, Business—Overview, of this Annual Report on Form 10-K.

Nominating and Corporate Governance Committee

In ~~2016~~2017, the Nominating and Corporate Governance Committee of the TNGP Board of Directors met three times and each member of the committee attended 100 percent of the meetings of the committee. The Nominating and Corporate Governance Committee is currently composed of Messrs. Bailey (Chairman) and Jackson, and Ms. Lloyd. Each of these committee members is a non-employee director and meets the independence requirements as set forth in the NYSE listing standards. The purpose of the Nominating and Corporate Governance Committee is to assist the TNGP Board of Directors in fulfilling its responsibilities to unitholders by shaping the corporate governance of the Partnership and enhancing the quality and independence of the nominees to the TNGP Board of Directors. The General Partner's Corporate Governance Guidelines establish that potential director candidates shall be selected on the basis of broad experience; wisdom; integrity; ability to make independent analytical inquiries; understanding of TNGP's business environment and willingness to devote adequate time and energy to the TNGP Board of Directors' duties. The General Partner's Corporate Governance Guidelines also establishes that the TNGP Board of Directors will consider directors of diverse backgrounds, in terms of both the individuals involved and their various experiences and areas of expertise.

The TNGP Board of Directors has determined that the above mentioned policy has been implemented appropriately when, and has been effective in, determining the qualifications of potential director candidates to the TNGP Board of Directors.

The current Nominating and Corporate Governance Committee Charter was adopted by the TNGP Board of Directors on October 27, 2015, and is reviewed annually by the Nominating and Corporate Governance Committee. A copy can be viewed on CF Industries' Internet website at www.cfindustries.com by selecting "Investors" and "Terra Nitrogen Investors" and "IR Menu' and "Corporate Profile" and "Governance Documents." The charter is also available in print upon request as described in Item 1, Business—Overview, of this Annual Report on Form 10-K.

Section 16(a) Beneficial Ownership Reporting Compliance

Section 16(a) of the Securities Exchange Act of 1934 (Exchange Act) requires the Partnership's executive officers, directors and greater than 10 percent beneficial owners to file initial reports of ownership and reports of changes in beneficial ownership with the SEC and the NYSE. TNCLP and the Operating Partnership have no executive officers, directors, or employees. Therefore, the executive officers and directors of TNGP are required by SEC regulations to furnish the Partnership with copies of reports of ownership and changes in ownership of our common units they file. Based solely on a review of the copies of such forms furnished to the Partnership and written representations from TNGP's executive officers and directors, we believe all of the Partnership's officers, directors and greater than 10 percent beneficial owners made all required filings during and with respect to ~~2016~~2017 in a timely manner.

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Corporate Governance Matters

TNGP has adopted Corporate Governance Guidelines which meet the requirements of the NYSE. Because TNGP is a wholly-owned subsidiary of CF Industries whose officers are all officers of CF Industries, the CF Industries' Code of Corporate Conduct applies to TNGP's executive officers (including its principal executive officer and principal financial officer) and other officers. In addition, the CF Industries' Code of Corporate Conduct applies to TNGP's non-management directors in the same fashion as it applies to CF Industries' non-management directors. The CF Industries Code of Corporate Conduct also meets the requirements of the NYSE. A copy of the General Partner's Corporate Governance Guidelines and CF Industries' Code of Corporate Conduct can be viewed on CF Industries' Internet website at www.cfindustries.com by selecting "Investors" and "Terra Nitrogen Investors" and "IR Menu" and "Corporate Profile" and "Governance Documents." A copy of each is also available in print upon request by following the directions contained in Item 1, Business—Overview, of this Annual Report on Form 10-K. We intend to disclose on CF Industries' Internet website any amendment to any provision of the CF Industries Code of Corporate Conduct that relates to any element of the definition of "code of ethics" enumerated in Item 406(b) of Regulation S-K under the Exchange Act and any waiver from any such provision granted to TNGP's principal executive officer, principal financial officer, principal accounting officer or controller or persons performing similar functions.

The TNGP Board of Directors has affirmatively determined that Messrs. Bailey and Jackson, and Ms. Lloyd each meet the criteria for independence required by the NYSE listing standards. Following its evaluation, the TNGP Board of Directors concluded that none of these directors were involved in any transaction, relationship or arrangement not otherwise disclosed that would impair his or her independence.

During ~~2016~~2017, in accordance with the General Partner's Corporate Governance Guidelines, the independent directors met at regularly scheduled executive sessions of the TNGP Board of Directors without management or management directors. The executive sessions are held at TNGP Board of Directors meetings and the independent directors choose one of the independent directors to lead the discussion and preside at each such meeting.

Communication

Interested parties who wish to communicate a message to the TNGP Board of Directors, the independent directors, or any committee may do so by contacting Ms. Anne H. Lloyd, Chairman of the Audit Committee, Terra Nitrogen GP Inc., 4 Parkway North, Suite 400, Deerfield, IL 60015-2590.

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ITEM 11. EXECUTIVE COMPENSATION.

Compensation Discussion and Analysis

We do not have any executive officers or employees. Instead, we are managed by the General Partner, TNGP, the executive officers of which are officers of CF Industries or its subsidiaries. CF Industries indirectly owns approximately 75.1% of the outstanding common units and all of the outstanding Class B common units representing our limited partnership interests and CF Industries is also the indirect 100% owner of TNGP. The executive officers of TNGP are provided compensation and benefits directly from subsidiaries of CF Industries. The compensation committee of the Board of Directors of CF Industries is responsible for the compensation decisions relating to the executive officers of TNGP. The TNGP Board of Directors does not have a compensation committee and does not make any decisions with respect to the compensation of TNGP's executive officers. For more discussion regarding the compensation provided to the executive officers of TNGP by CF Industries, see the Schedule 14A definitive proxy statement of CF Industries, which will be filed with the SEC when available (the Proxy Statement).

Since neither TNCLP nor TNGP provides any compensation directly to TNGP's executive officers and neither has any involvement in determining their compensation, we have concluded that a discussion of the compensation awarded to, earned by and paid to TNGP's named executive officers, as contemplated by Item 402(b) of Regulation S-K, would not be meaningful. Therefore, our Compensation Discussion and Analysis does not resemble that of most public companies. Instead, we think it is more meaningful to describe the arrangement pursuant to which we receive services from CF Industries.

Since we have no executive officers or employees, all employment-related functions, including production planning, manufacturing management, logistics, accounting, legal, risk management, investor relations and other general and administrative functions are provided to us by employees of subsidiaries of CF Industries.

We reimburse subsidiaries of CF Industries for a portion of the compensation expenses incurred with respect to TNGP's executive officers and other employees of CF Industries and its affiliates who provide services to us. Compensation expenses for production and manufacturing services are charged directly to us based on actual costs. Compensation expenses for selling, general and administrative related functions, including the compensation of the TNGP's executive officers, are reimbursed based on a quarterly fixed fee arrangement.

Further discussion of our arrangements with subsidiaries of CF Industries can be found in Note 10—Related Party Transactions, of the Notes to the Consolidated Financial Statements, included in Item 8,. Financial Statements and Supplementary Data, of this Annual Report on Form 10-K.

Compensation Committee Report

TNCLP has no directors or executive officers and the TNGP Board of Directors serves as TNCLP's governing body. TNGP does not have a compensation committee. Therefore, the full TNGP Board of Directors reviewed and discussed the Compensation Discussion and Analysis with TNGP's management. Based on such review and discussions, the TNGP Board of Directors recommended that the Compensation Discussion and Analysis be included in TNCLP's Annual Report on Form 10-K.

Respectfully submitted,

Douglas C. Barnard, Chairman

Coleman L. Bailey

Christopher D. Bohn

Richard A. Hoker

Michael A. Jackson

Dennis P. Kelleher

Anne H. Lloyd

SUMMARY COMPENSATION TABLE

Pursuant to the SEC's executive compensation disclosure rules, a required table may be omitted if there has been no compensation awarded to, earned by or paid to any named executive officer that is required to be reported in that table. Therefore, we have not included a Summary Compensation Table or any other table (or any of the corresponding narrative disclosures) regarding compensation paid to named executive officers, because we have no employees, and, as such, no compensation was paid to any named executive officer by either TNGP or us during ~~2016~~2017. Similarly, there is no potential compensation to disclose with respect to a potential termination of employment of any named executive officer.

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2017 Pay Ratio

Under new SEC rules, companies are required to disclose the ratio of the total annual compensation of their principal executive officer to their median employee’s total annual compensation. As described above, we do not have any executive officers or employees, and did not have any executive officers or employees during our fiscal year 2017, and therefore we had no compensation from which to derive pay ratio disclosure pursuant to such new SEC rules.

DIRECTOR COMPENSATION

TNCLP has no directors. The following table summarizes the compensation of each non-employee director of the TNGP Board of Directors for the fiscal year ended December 31, ~~2016~~2017.

Name	Fees ~~Earnedin~~Earned or Paid in Cash($)(1)		Stock Awards($)(2)		Total
Coleman L. Bailey	$	5262,500	$	~~132~~116,~~587~~449	$	~~185~~178,~~087~~949
Michael A. Jackson	$	5060,000	$	~~121~~114,~~751~~427	$	~~171~~174,~~751~~427
Anne H. Lloyd	$	6070,000	$	~~116~~104,~~283~~042	$	~~176~~174,~~283~~042

_______________________________________________________________________________


⁽¹⁾	For information about the nature of fees earned during the fiscal year, see the narrative accompanying this table.

(2) This column represents the fair value under Financial Accounting Standards Board Accounting Standards Codification 718, Stock Compensation, with respect to TNCLP phantom units granted to each non-employee director of the TNGP Board of Directors in ~~2016~~2017, including additional phantom units received in connection with quarterly distributions to TNCLP common unitholders during the year on phantom units held by the director. The phantom unit awards granted to directors in ~~2016~~2017 will settle in cash based upon the average closing price per common unit for the 20-trading-day period that immediately precedes the vesting date (unless deferred pursuant to the terms of the TNGP Phantom Unit Program). Additional information with respect to the TNGP Phantom Unit Program is set forth below under "Director Phantom Unit Awards."

Director Fees Paid in Cash

In ~~2016~~2017, each non-employee director of the TNGP Board of Directors received an annual retainer of $5060,000 (paid quarterly). We do not pay meeting fees to our non-employee directors. Ms. Lloyd received an additional annual cash retainer of $10,000 (paid quarterly) for serving as Chairman of the Audit Committee. Mr. Bailey received an additional annual cash retainer of $2,500 (paid quarterly) for serving as Chairman of the Nominating and Corporate Governance Committee. In ~~2016~~2017, Messrs. Barnard, Bohn, Kelleher and Hoker served on the TNGP Board of Directors and were employees of CF Industries, and therefore receive no additional compensation for serving on the TNGP Board of Directors.

The TNGP Board of Directors recently determined to revise the compensation of non-employee directors for 2017. Effective January 1, 2017, each non-employee of the TNGP Board of Directors will receive an annual retainer of $60,000 (paid quarterly). The Chairman of the Audit Committee will be entitled to an additional annual cash retainer of $10,000 (paid quarterly) and the Chairman of the Nominating and Corporate Governance Committee will be entitled to an additional annual cash retainer of $2,500 (paid quarterly).

Director Ownership Guidelines

The TNGP Board of Directors has established a minimum ownership guideline for non-employee directors of 2,000 common units (the Ownership Guide). Newly elected directors have a period of five years to satisfy the Ownership Guide. The Ownership Guide may be satisfied by ownership of common units, accrual of phantom units under TNGP Board of Directors-approved compensation programs or any combination of the two.

Director Phantom Unit Awards

Non-employee directors of the TNGP Board of Directors receive compensation in the form of TNCLP phantom units. A phantom unit entitles the holder to a cash payment equal to the value of a TNCLP common unit at the time of vesting. In addition, each phantom unit entitles the holder to additional phantom units when quarterly cash distributions are made to TNCLP common unitholders. Non-employee directors receive an annual award of a number of phantom units determined by dividing a value fixed by the TNGP Board of Directors by the average month-end closing price of TNCLP common units for the six-month period preceding the date of grant. ~~Starting~~The ~~in 2012, the~~ grant date value of the annual award ~~was~~is currently fixed at $90,000. The annual awards are granted upon the first meeting of the TNGP Board of Directors each year.

The annual awards are governed by the Terra Nitrogen GP Inc. Non-Employee Director Phantom Unit and Deferred Compensation Plan (the TNGP Phantom Unit Program). Each phantom unit granted pursuant to the TNGP Phantom Unit Program is unvested on the date of grant. ~~For~~Each ~~grants made prior to 2015, each~~ phantom unit vested automatically on the first anniversary of the grant date, provided that the director continued to serve on the TNGP Board of Directors through such date. For grants made during or after 2015, each phantom unit vests automatically on the earlier of (i) a director's separation from service that is other than a removal for cause or (ii) the date of the first meeting of the TNGP Board of Directors of the calendar ~~year following the date of grant of the award. Unless a director elected to defer phantom units (as described below), upon~~

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year following the date of grant of the award. Unless a director elected to defer phantom units (as described below), upon vesting, the director will receive a cash payment in respect of the phantom units (including any additional phantom units received in connection with quarterly distributions to TNCLP common unitholders following the date of grant). The amount paid with respect to each such phantom unit will be equal to the average closing price per common unit for the 20-trading-day period immediately preceding the vesting date.

Under the TNGP Phantom Unit Program, directors may elect to defer receipt of phantom units granted pursuant to the TNGP Phantom Unit Program. Each non-employee director may elect in writing, prior to December 31 of any year, to defer receipt of payment with respect to all or a portion (but not less than 25%) of phantom units that may be awarded during the following year. Phantom units (including any additional phantom units received in connection with quarterly distributions to TNCLP common unitholders following the date of the grant) that a non-employee director elects to defer are credited to an unfunded deferred compensation account. Deferred phantom units are generally required to be held in an unfunded deferred compensation account until the date of the director's departure from the TNGP Board of Directors. Pursuant to the terms of the TNGP Phantom Unit Program, amounts credited to a director's deferred compensation account shall be deemed to be invested in TNCLP common units or in such form of alternative unit as the director designates from among the options made available from time to time by TNGP. Upon departure, the deferred compensation account value is paid out in cash based on the average closing price of TNCLP common units or alternative unit, as applicable, for the 20-trading-day period immediately following departure. However, in the event of a sale of TNCLP (including by merger or other corporate transaction) or a sale of substantially all of TNCLP's assets, the value of deferred phantom units will be paid in a lump sum upon consummation of the transaction.

In 2005, the TNGP Board of Directors adopted a phantom unit program (the 2005 Phantom Unit Program) which entitled each non-employee director of TNGP to an annual grant of 1,250 TNLP phantom units. All phantom unit awards granted pursuant to the 2005 Phantom Unit Program are generally required to be held in an unfunded deferred compensation account until the date of the director's departure from the TNGP Board of Directors. Amounts credited to a director's deferred compensation account shall be deemed to be invested in TNCLP common units or in such form of alternative unit as the director designates from among the options made available from time to time by TNGP. Upon departure, the deferred compensation account value is paid out in cash based on the average closing price of TNCLP common units or alternative units, as applicable, for the 20-trading-day period immediately following departure. However, in the event of a sale of TNCLP (including by merger or other corporate transaction) or a sale of substantially all of TNCLP's assets, the value of the deferred phantom units will be paid in a lump sum upon consummation of the transaction.

The following table sets forth the number of phantom units held by each non-employee director as of February 1615, ~~2017~~2018, and awards vested in ~~2016~~2017.

Number of PhantomUnits Currently Held

Number of PhantomUnits Vested in 2016

Value Realizedon Vesting ($)

Number of PhantomUnits Vested in 2017

Value Realizedon Vesting ($)

Name

Vested

Unvested

Coleman L. Bailey

~~745~~919.1506

7299,~~905~~957

4,~~203~~467.1001

~~822~~1,116.5363

Michael A. Jackson

~~745~~919.1506

7299,~~905~~957

34,~~818~~932.8682

~~822~~1,116.5363

Anne H. Lloyd

~~745~~919.1506

7299,~~905~~957

2,~~701~~561.6304

~~822~~1,116.5363

Other Director Compensation

TNGP reimburses all directors for reasonable travel and other necessary business expenses incurred in the performance of their services for TNGP and TNCLP. Non-employee directors do not receive any additional payments or perquisites.

Compensation Committee Interlocks and Insider Participation

TNGP does not have a compensation committee. The Compensation Committee of the Board of Directors of CF Industries has made executive officer compensation decisions with respect to those TNGP executive officers who are also key employees of CF Industries. The Compensation Committee of CF Industries is composed of the directors named as signatories to the "Report on Executive Compensation" as set forth in CF Industries' Proxy Statement. No such director has any direct or indirect material interest in or relationship with TNGP other than as related to his or her position as a director of CF Industries. During ~~2016~~2017, no officer of TNGP served on the board of directors of any other entity, where any officer or director of such other entity also served on the TNGP Board of Directors or CF Industries' Compensation Committee. None of the members of CF Industries' Compensation Committee are employees of CF Industries or its subsidiaries.

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ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS.

TNGP owns the entire general partner interest in both TNCLP and the Operating Partnership. TNGP's principal executive offices are located at 4 Parkway North, Suite 400, Deerfield, Illinois 60015-2590. CF Industries ~~Enterprises~~, Inc. ~~owns~~is ~~all~~a ~~the~~direct ~~outstanding~~wholly ~~capital~~owned ~~stock~~subsidiary of ~~TNGP~~CF Industries Holdings, Inc., and isCF anIndustries ~~indirect~~Enterprises, ~~wholly-owned~~Inc., ~~subsidiary~~Terra ofNitrogen GP, Inc., CF Industries. Sales, LLC and Terra LP Holdings LLC ~~(also~~are an indirect wholly- owned ~~subsidiary~~subsidiaries of CF Industries) Holdings, Inc. CF Industries Enterprises, Inc. owns all the outstanding capital stock of TNGP. Terra LP Holdings LLC owned directly, as of February 1615, ~~2017~~2018, 13,889,014 common units of TNCLP and all 184,072 of the Class B common units of TNCLP. CF Industries Holdings, Inc. and its subsidiaries are engaged in certain transactions with the Partnership described under the caption "Certain Relationships and Related Transactions" below.

The following table shows the ownership of TNCLP common units and CF Industries Holdings, Inc. common stock as of February 1615, ~~2017~~2018 by (a) each person known to TNGP to be a beneficial owner of more than 5 percent of the TNCLP common units (based on information reported to the SEC by or on behalf of such persons), (b) each director of TNGP and (c) each executive officer of TNGP. Unless otherwise stated below, the address of each of the following persons is 4 Parkway North, Suite 400, Deerfield, Illinois 60015-2590.

Name	Number ofTNCLP Common UnitsBeneficiallyOwned	Percent ofClass		Number of ~~CFIndustriesCommon~~CFIndustries Holdings,Inc. Common SharesBeneficiallyOwned(1),(2)	Percent ofClass
CF Industries Holdings, Inc.(3)	13,889,014	75.1	%	—	—
CF Industries Holdings, Inc.(3)(4)	18,501,576	100.0	%	—	—
CF Industries, Inc.(3)	13,889,014	75.1	%	—	—
CF Industries, Inc.(3)(4)	18,501,576	100.0	%	—	—
CF Industries Enterprises, Inc.(3)	13,889,014	75.1	%	—	—
CF Industries Enterprises, Inc.(3)(4)	18,501,576	100.0	%	—	—
CF Industries Sales, LLC(3)	13,889,014	75.1	%	—	—
Terra LP Holdings LLC(3)	13,889,014	75.1	%	—	—
Terra Nitrogen GP Inc.(4)	—	—		—	—
Terra Nitrogen GP Inc.(4)(5)	4,612,562	24.9	%	—	—
Coleman L. Bailey	—	—		—	—
Douglas C. Barnard	—	—		~~344~~402,~~873~~462	*
Christopher D. Bohn	—	—		~~138~~189,~~849~~150	*
Bert A. Frost	—	—		~~364~~415,~~759~~831	*
Adam Hall	—	—		71110,~~952~~399	*
Richard A. Hoker	—	—		~~131~~156,~~661~~467	*
Wendy S. Jablow	—	—		171,902	*
Michael A. Jackson	—	—		—	—
Dennis P. Kelleher	—	—		~~285~~373,~~881~~462	*
Anne H. Lloyd	—	—		—	—
W. Anthony Will	—	—		724,528	*
Susan L. Menzel	—	—		—	—
All directors and executive officers as a group (11 persons)	—	—		2,234,405	*
W. Anthony Will	—	—		1,037,890	*
All directors and executive officers as a group (11 persons)	—	—		2,685,661	*

_______________________________________________________________________________


*	Represents less than 1% of class.

(1) Each person has sole voting and investment power of all the CF Industries Holdings, Inc. common shares indicated, either individually or jointly or in common with the individual’s spouse, subject to community property laws where applicable.

(2) The shares indicated for Messrs. Barnard, Bohn, Frost, Hall, Hoker, Kelleher and Will ~~and Ms. Jablow~~ include shares underlying stock options granted under CF Industries' equity and incentive plans that have already vested or that will vest within 60 days. The shares underlying these stock options cannot be voted. Except for shares underlying restricted stock units that vest within 60 days, the table does not include restricted stock units or performance vesting restricted stock units granted pursuant to CF Industries’ equity and incentive plans, as these awards cannot be voted during the vesting period. The table does not include “phantom” shares held by Messrs. Barnard, Hoker, and Will ~~and Ms. Jablow~~ as a deemed investment under CF Industries’ Supplemental Benefit and Deferral Plan (a non-qualified benefits restoration and deferred compensation plan), as these phantom shares cannot be voted.

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(3) By virtue of its ownership of all the outstanding equity of Terra LP Holdings LLC, CF Industries Sales, LLC may be deemed to possess indirect beneficial ownership of the common units beneficially owned by Terra LP Holdings LLC. By virtue of its ownership of all the outstanding equity of CF Industries Sales, LLC and Terra Nitrogen GP, Inc., CF Industries Enterprises, Inc. may be deemed to possess indirect beneficial ownership of the common units beneficially owned by Terra Nitrogen GP Inc., Terra LP Holdings LLC and CF Industries Sales, LLC. By virtue of its ownership of all the outstanding common stock of CF Industries Enterprises, Inc., CF Industries, Inc. may be deemed to possess indirect beneficial ownership of the common units beneficially owned by Terra Nitrogen GP Inc., Terra LP Holdings LLC, CF Industries Sales, LLC and CF Industries Enterprises, Inc. By virtue of its ownership of all the outstanding common stock of CF Industries, Inc., CF Industries Holdings, Inc. may be deemed to possess indirect beneficial ownership of the common units beneficially owned by Terra Nitrogen GP Inc., Terra LP Holdings LLC, CF Industries Sales, LLC, CF Industries Enterprises, Inc. and CF Industries, Inc.

(4) Number of common units beneficially owned includes 4,612,562 common units deemed to be beneficially owned based on Terra Nitrogen GP Inc.,'s ~~the~~right ~~General~~to ~~Partner~~acquire voting and investment power over such common units on April 2, ~~owns~~2018 ~~the~~as ~~entire~~a ~~general~~result ~~partner~~of ~~interest~~the inexercise of the ~~Partnership~~call right.


⁽⁵⁾	Terra Nitrogen GP Inc., the General Partner, owns the entire general partner interest in the Partnership.

Equity Compensation Plan Information

The Partnership maintains no separate equity compensation plans. All equity compensation benefits awarded to TNGP executive officers who are also key employees of CF Industries Holdings, Inc. are awarded through CF Industries Holdings, Inc.'s equity compensation plans, all of which are described in CF Industries Holdings, Inc.'s filings with the SEC.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE.

~~Our~~The ~~agreement~~TNCLP ofPartnership ~~limited~~Agreement ~~partnership~~ generally provides that whenever a potential conflict of interest exists or arises between the General Partner or any of its affiliates, on the one hand, and the Partnership or any partner or assignee, on the other hand, any resolution or course of action in respect of such conflict of interest shall be permitted and deemed approved by all partners, and shall not constitute a breach of the ~~agreement~~TNCLP ofPartnership ~~limited partnership~~Agreement, of any agreement contemplated therein, or of any duty stated or implied by law or equity, if the resolution or course of action is, or by operation of the ~~agreement~~TNCLP ofPartnership ~~limited~~Agreement ~~partnership~~ is deemed to be, fair and reasonable to TNCLP.

In connection with its resolution of any conflict of interest, the General Partner may consider:


•	the relative interests of any party involved in such conflict or affected by such action, agreement, transaction or situation and the benefits and burdens relating to such interest;


•	any customary or accepted General Partner and industry practices;


•	any applicable generally accepted accounting practices or principles; and


•	such additional factors as the General Partner determines in its sole discretion to be relevant, reasonable or appropriate under the circumstances.

Under ~~our~~the ~~agreement~~TNCLP ofPartnership ~~limited partnership~~Agreement, in the absence of bad faith by the General Partner, the resolution, action or terms so made, taken or provided by the General Partner with respect to any conflict of interest will not constitute a breach of the ~~agreement~~TNCLP ofPartnership ~~limited~~Agreement ~~partnership~~ or any agreement contemplated thereby or any standard of care or duty imposed in the ~~agreement~~TNCLP ofPartnership ~~limited~~Agreement ~~partnership~~ or such other agreements or under any law, rule or regulation.

Finally, ~~our~~the ~~agreement~~TNCLP ofPartnership ~~limited~~Agreement ~~partnership~~ provides that TNCLP may not lend funds to the General Partner or any of its affiliates (other than the Operating Partnership), except for short-term funds for management purposes.

Information with respect to certain relationships and related transactions is contained in Notes to the Consolidated Financial Statements, Note 10—Related Party Transactions, included in Item 8,. Financial Statements and Supplementary Data, of this Annual Report on Form 10-K, and is incorporated herein by reference. Information with respect to director independence is set forth in Item 10,. Directors, Executive Officers and Corporate Governance, and is incorporated herein by reference.

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ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES .

Principal Accountant Audit Fees and Services Fees

The following table describes fees for professional audit services rendered by KPMG LLP (KPMG) for the audit of the Partnership's annual financial statements for the years ended December 31, ~~2016~~2017 and ~~2015~~2016 and fees billed for other services rendered by KPMG during those periods.

Type of Fee	~~2016~~2017		~~2015~~2016
Audit fees(1)	$	~~311~~321,~~750~~000	$	~~303~~311,~~000~~750
Audit related fees	—		—
Total audit and audit related fees	~~311~~321,~~750~~000		~~303~~311,~~000~~750
Tax fees	—		—
All other fees	—		—
Total fees	$	~~311~~321,~~750~~000	$	~~303~~311,~~000~~750

_______________________________________________________________________________


⁽¹⁾	Audit fees include the aggregate fees paid by the Partnership during the fiscal year indicated for professional services rendered by KPMG for the audit of the Partnership's consolidated financial statements included in the Partnership's Annual Report on Form 10-K and review of consolidated financial statements included in the Partnership's quarterly reports on Form 10-Q.

Audit Committee Pre-Approval of Policies and Procedures

Pursuant to its charter, the Audit Committee of the TNGP Board of Directors is responsible for reviewing and approving, in advance, any audit and any permissible non-audit engagement or relationship between TNGP and its independent auditors. KPMG's engagement to conduct the audit of the Partnership's financial statements included herein was approved by the Audit Committee of the TNGP Board of Directors on February 53, ~~2016~~2017. Additionally, each permissible non-audit engagement or service performed by KPMG is required to be reviewed and approved in advance by the Audit Committee of the TNGP Board of Directors, as provided in its charter.

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Part IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

(a)	Documents filed as part of this report:
	1.	The following financial statements are included in Part II, Item 8. Financial Statements and Supplementary Data.
		Report of Independent Registered Public Accounting Firm	3435
		Consolidated Balance Sheets	3536
		Consolidated Statements of Operations	3637
		Consolidated Statements of Partners' Capital	3738
		Consolidated Statements of Cash Flows	3839
		Notes to the Consolidated Financial Statements	3940
		Financial statement schedules are omitted because they are not applicable or the required information is included in the consolidated financial statements or notes thereto.
	2.	Exhibits:	65
		A list of exhibits filed with this Annual Report on Form 10-K (or incorporated by reference to exhibits previously filed or furnished) is provided in the Exhibit Index on page 67.
		A list of exhibits filed with this Annual Report on Form 10-K (or incorporated by reference to exhibits previously filed or furnished) is provided in the Exhibit Index on page 70.

ITEM 16. FORM 10-K SUMMARY.

None.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		Terra Nitrogen Company, L.P.
		By:	Terra Nitrogen GP Inc.,as General Partner
Date:	February 23, 2017	By:	/s/ W. ANTHONY WILL
			W. Anthony Will President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant as of February 23, 2017 and in the capacities indicated.

Signature Title /s/ W. ANTHONY WILL President and Chief Executive Officer of Terra Nitrogen GP Inc. (Principal Executive Officer) W. Anthony Will /s/ DENNIS P. KELLEHER Director, Senior Vice President and Chief Financial Officer of Terra Nitrogen GP Inc. (Principal Financial Officer) Dennis P. Kelleher /s/ RICHARD A. HOKER Director, Vice President and Corporate Controller of Terra Nitrogen GP Inc. (Principal Accounting Officer) Richard A. Hoker /s/ DOUGLAS C. BARNARD Director and Chairman of the Board of Terra Nitrogen GP Inc. Douglas C. Barnard /s/ COLEMAN L. BAILEY Director of Terra Nitrogen GP Inc. Coleman L. Bailey /s/ CHRISTOPHER D. BOHN Director of Terra Nitrogen GP Inc. Christopher D. Bohn /s/ MICHAEL A. JACKSON Director of Terra Nitrogen GP Inc. Michael A. Jackson /s/ ANNE H. LLOYD Director of Terra Nitrogen GP Inc. Anne H. Lloyd

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TERRA NITROGEN COMPANY, L.P.

EXHIBIT INDEX

EXHIBIT NO.			DESCRIPTION
3.1			Certificate of ~~Amendment to Certificate of~~ Limited Partnership of Terra Nitrogen Company, L.P. ~~dated September 1, 2005, filed as Exhibit 3.5 to the Terra Industries Inc. Form 10-Q for the quarterly period ended September 30, 2005 (File No. 001-08520), is incorporated herein by reference.~~
3.2			First Amended and Restated Agreement of Limited Partnership of Terra Nitrogen Company, L.P., dated as of September 1, 2005, filed as Exhibit 3.1 to Terra Nitrogen Company, L.P.'s Form 8-K filed on September 7, 2005 (File No. 033-43007), is incorporated herein by reference.
3.3			Amendment No.1 to First Amended and Restated Agreement of Limited Partnership of Terra Nitrogen Company, L.P., dated as of April 26, 2012, filed as Exhibit 3.1 to Terra Nitrogen Company, L.P.'s Form 8-K filed on May 2, 2012 (File No. 033-43007), is incorporated herein by reference.
3.4			Certificate of Incorporation of Terra Nitrogen GP Inc., dated August 29, 2005, filed as Exhibit 3.2 to Terra Nitrogen Company, L.P.'s Form 8-K filed on September 7, 2005 (File No. 033-43007), is incorporated herein by reference.
3.5			By-Laws of Terra Nitrogen GP Inc., filed as Exhibit 3.3 to Terra Nitrogen Company, L.P.'s Form 8-K filed on September 7, 2005 (File No. 033-43007), are incorporated herein by reference.
3.6			Certificate of ~~Amendment to Certificate of~~ Limited Partnership of Terra Nitrogen, Limited Partnership~~, dated September 1, 2005, filed as Exhibit 3~~.~~6 to the Terra Industries Inc. Form 10-Q for the quarterly period ended September 30, 2005 (File No. 001-08520), is incorporated herein by reference.~~
3.7			Amended and Restated Agreement of Limited Partnership of Terra Nitrogen, Limited Partnership, dated as of September 1, 2005, filed as Exhibit 10.3 to Terra Nitrogen Company, L.P.'s Form 8-K filed on September 7, 2005 (File No. 033-43007), is incorporated herein by reference.
3.8			Amendment No.1 to First Amended and Restated Agreement of Limited Partnership of Terra Nitrogen Limited Partnership, dated as of April 26, 2012, filed as Exhibit 3.8 to the Terra Nitrogen Company, L.P. Form 10-K for the fiscal year ended December 31, 2012 (File No. 033-43007), is incorporated herein by reference.
4.1			Deposit Agreement, ~~among~~dated ~~Terra~~as ~~Nitrogen~~of ~~Company~~December 4, ~~L.P.~~1991, ~~the~~by ~~Depositary~~ and ~~Unitholders,~~among ~~filed as Exhibit 4.1 to the~~ Terra Nitrogen Company, L.P., ~~Form~~the ~~10-K~~Depositary ~~for~~and the ~~fiscal year ended December 31, 1991 (File No~~Unitholders. ~~1-10877), is incorporated herein by reference.~~
4.2			Form of Depositary Receipt for Common Units (included as Exhibit B to the Deposit Agreement ~~incorporated~~filed ~~by reference~~ as Exhibit 4.1 ~~hereto~~above).
4.3			Form of Transfer Application (included in Exhibit B to the Deposit Agreement ~~incorporated~~filed ~~by reference~~ as Exhibit 4.1 ~~hereto~~above).
10.1			Amended and Restated Terminal Lease agreement dated December 28, 2012, by and between Terra Nitrogen Company, L.P. and CF Industries, Inc., filed as Exhibit 10.1 to Terra Nitrogen Company, L.P.'s Form 8-K filed on December 28, 2012 (File No. 033-43007), is incorporated herein by reference.
10.2			Amendment to the General and Administrative Services and Product Offtake Agreement by and between CF Industries, Inc., Terra Industries Inc., Terra Nitrogen GP Inc. and Terra Nitrogen Company, L.P., dated September 28, 2010, filed as Exhibit 10.1 to Terra Nitrogen Company, L.P.'s Form 8-K filed on September 29, 2010 (File No. 033-43007), is incorporated herein by reference.
10.3			Tank Car Lease Agreement dated December 29, 2010, between Terra Nitrogen Company, L.P. and CF Industries, Inc., filed as Exhibit 10.2 to Terra Nitrogen Company, L.P.'s Form 8-K filed on December 30, 2010 (File No. 033-43007), is incorporated herein by reference.
10.4			Spare Parts Sharing Agreement, dated as of May 6, 2013, by and among CF Industries Nitrogen, LLC, Terra Nitrogen, Limited Partnership and Canadian Fertilizers Limited, filed as Exhibit 10.1 to the Terra Nitrogen Company, L.P. Form 10-Q for the quarterly period ended March 31, 2013 (File No. 033-43007), is incorporated herein by reference.
10.5			Form of Terra Nitrogen GP Inc. Non-Employee Director Phantom Unit Agreement, amended and restated October 27, 2015, filed as Exhibit 10.5 to the Terra Nitrogen Company, L.P. Form 10-K for the fiscal year ended December 31, 2015 (File No. 1-10877), is incorporated herein by reference.**
10.6			Form of Terra Nitrogen GP Inc. Non-Employee Director Phantom Unit and Deferred Compensation Plan, amended and restated October 27, 2015, filed as Exhibit 10.6 to the Terra Nitrogen Company, L.P. Form 10-K for the fiscal year ended December 31, 2015 (File No. 1-10877), is incorporated herein by reference.**
10.7			Form of Award Agreement under the Terra Nitrogen GP Inc. Non-Employee Director Phantom Unit and Deferred Compensation Plan, filed as Exhibit 10.7 to the Terra Nitrogen Company, L.P. Form 10-K for the fiscal year ended December 31, 2015 (File No. 1-10877), is incorporated herein by reference.**

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EXHIBIT NO.			DESCRIPTION
10.6			Form of Terra Nitrogen GP Inc. Non-Employee Director Phantom Unit and Deferred Compensation Plan, amended and restated October 27, 2015, filed as Exhibit 10.6 to the Terra Nitrogen Company, L.P. Form 10-K for the fiscal year ended December 31, 2015 (File No. 1-10877), is incorporated herein by reference.**
10.8			Assignment and Assumption Agreement, dated as of February 7, 2018, by and between Terra Nitrogen Company, L.P. and Terra Nitrogen GP Inc. filed as Exhibit 10.1 to Terra Nitrogen Company, L.P.'s Form 8-K filed on February 7, 2018 (File No. 033-43007), is incorporated herein by reference.
10.7			Form of Award Agreement under the Terra Nitrogen GP Inc. Non-Employee Director Phantom Unit and Deferred Compensation Plan, filed as Exhibit 10.7 to the Terra Nitrogen Company, L.P. Form 10-K for the fiscal year ended December 31, 2015 (File No. 1-10877), is incorporated herein by reference.**
21			Subsidiaries of the Registrant.
31.1			Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2			Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1			Certification of Principal Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2			Certification of Principal Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101			The following financial information from Terra Nitrogen Company, L.P.'s Annual Report on Form 10-K for the fiscal year ended December 31, ~~2016~~2017, formatted in XBRL (eXtensible Business Reporting Language): (1) Consolidated Balance Sheets, (2) Consolidated Statements of Operations, (3) Consolidated Statements of Partners' Capital, (4) Consolidated Statements of Cash Flows and (5) the Notes to the Consolidated Financial Statements.

_______________________________________________________________________________


**	Management contract or compensatory plan or arrangement required to be filed (and/or incorporated by reference) as an exhibit to this Annual Report on Form 10-K pursuant to Item 15(a)(3) of Form 10-K.

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SIGNATURES



		Terra Nitrogen Company, L.P.
		By:	Terra Nitrogen GP Inc., as General Partner

Date:	February 22, 2018	By:	/s/ W. ANTHONY WILL
			W. Anthony Will President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant as of February 22, 2018 and in the capacities indicated.



Signature		Title
/s/ W. ANTHONY WILL		President and Chief Executive Officer of Terra Nitrogen GP Inc. (Principal Executive Officer)
W. Anthony Will

/s/ DENNIS P. KELLEHER		Director, Senior Vice President and Chief Financial Officer of Terra Nitrogen GP Inc. (Principal Financial Officer)
Dennis P. Kelleher

/s/ RICHARD A. HOKER		Director, Vice President and Corporate Controller of Terra Nitrogen GP Inc. (Principal Accounting Officer)
Richard A. Hoker

/s/ DOUGLAS C. BARNARD		Director and Chairman of the Board of Terra Nitrogen GP Inc.
Douglas C. Barnard

/s/ COLEMAN L. BAILEY		Director of Terra Nitrogen GP Inc.
Coleman L. Bailey		Director of Terra Nitrogen GP Inc.

/s/ CHRISTOPHER D. BOHN		Director of Terra Nitrogen GP Inc.
Christopher D. Bohn		Director of Terra Nitrogen GP Inc.

/s/ MICHAEL A. JACKSON		Director of Terra Nitrogen GP Inc.
Michael A. Jackson		Director of Terra Nitrogen GP Inc.

/s/ ANNE H. LLOYD		Director of Terra Nitrogen GP Inc.
Anne H. Lloyd		Director of Terra Nitrogen GP Inc.

Filing Compare · TERRA NITROGEN CO L P /DE