UNITED ~~STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549~~STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August ~~July 30~~19, 2025

Black Hills Corporation

(Exact name of ~~Registrant~~registrant as ~~Specified~~specified in ~~Its Charter~~its charter)

South Dakota	001-31303	~~001-31303~~	46-0458824
(State or Other Jurisdictionof Incorporation)		(Commission File Number)	(IRS EmployerIdentification No.)
(State or other jurisdiction of incorporation)	(Commission File Number)		(IRS Employer Identification No.)
7001 Mount Rushmore Road
Rapid City, South Dakota			57702
(Address of Principal Executive Offices)			(Zip Code)

Registrant’s Telephone Number, Including Area Code: 605 721-1700

7001 Mount Rushmore Road	57702
Rapid City, South Dakota
(Address of principal executive offices)	(Zip Code)

~~(Former~~ ~~Name or Former Address, if Changed Since Last Report~~(605) 721-1700

~~Check~~(Registrant’s ~~the~~telephone ~~appropriate~~number, ~~box~~including area ~~below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:~~ code)

~~☐Written~~(Former ~~communications~~name ~~pursuant~~or toformer ~~Rule~~address, ~~425~~if ~~under~~changed since ~~the~~last ~~Securities Act (17 CFR 230.425~~report)

~~☐Soliciting~~Check ~~material~~the ~~pursuant~~appropriate tobox below ~~Rule~~if ~~14a~~the Form 8-12K ~~under~~filing is intended to simultaneously satisfy the ~~Exchange~~filing ~~Act~~obligation of the registrant under any of the following provisions (17see ~~CFR~~General ~~240~~Instruction A.~~14a-12~~2. below):

~~☐Pre-commencement~~ ¨ Written communications pursuant to Rule ~~14d-2(b)~~425 under the ~~Exchange~~Securities Act (17 CFR ~~240~~230.~~14d-2(b~~425))

~~☐Pre-commencement~~¨ Soliciting material ~~communications~~ pursuant to Rule ~~13e~~14a-~~4(c)~~12 under the Exchange Act (17 CFR 240.~~13e~~14a-~~4(c~~12))

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	~~TradingSymbol~~Trading Symbol(s)	Name of each exchange on which registered
Common stock of $1.00 par value	BKH	The New York Stock Exchange
Common Stock of $1.00 par value	BKH	New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of ~~1933~~1934 (§  230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§  240.12b-2 of this chapter).

Emerging growth company ☐¨

If an emerging growth company, indicate by check mark if the registrant has elected 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. ☐¨

Item 27.0201 ~~Results~~Regulation ofFD ~~Operations and Financial Condition~~Disclosure.

On ~~July 30~~August 19, 2025, Black Hills Corporation ~~("the~~and ~~Company")~~NorthWestern ~~issued~~Energy Group, Inc. released a joint press release announcing ~~financial~~the execution ~~results~~of ~~for~~an agreement and plan of merger as well as an investor presentation relating to the ~~second~~merger. ~~quarter~~Copies of ~~2025~~that press release and investor presentation are furnished as Exhibits 99.1 and 99.2, respectively.

~~The press release is attached as Exhibit 99 to this Form 8-K. This information is being furnished pursuant to~~ Item 29.0201. ofFinancial ~~Form~~Statements ~~8-K~~ and shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filingExhibits.

~~Item 9.01 Financial Statements and~~ (d) Exhibits.

Exhibit No.	Description	~~Description~~
99		Press Release dated July 30, 2025
99.1	Joint press release of NorthWestern and Black Hills issued on August 19, 2025.
104		Cover Page Interactive Data File (formatted as the inline XBRL document)
99.2	Joint investor presentation of NorthWestern and Black Hills released on August 19, 2025 (furnished herewith).
104	Cover Page Interactive Data File (formatted as the inline XBRL document).

~~SIGNATURES~~1

~~Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.~~SIGNATURES

			BLACK HILLS CORPORATION
Date:	July 30, 2025	By:	/s/ Kimberly F. Nooney
			Kimberly F. NooneySenior Vice President and Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Form 8-K to be signed on its behalf by the undersigned hereunto duly authorized.

	Black Hills Corporation

Dated: August 19, 2025	By:	/s/ Kimberly F. Nooney
		Kimberly F. Nooney, Senior Vice President and Chief Financial Officer

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