SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of

of the Securities Exchange Act of 1934

For the month of ~~February~~May 2025

Commission File No. 1-8887

TransCanada PipeLines Limited

(Translation of ~~Registrant~~Registrants’s ~~Name~~Names into English)

450 —- 1 Street S.W., Calgary, Alberta, T2P 5H1, Canada

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☐ o Form 40-F ☒ þ

~~Exhibits~~Exhibit 99.1, ~~99.2 and 99.3~~ to this report, furnished on Form 6-K, shall be incorporated by reference into the following Registration ~~Statement~~Statements under the Securities Act of 1933, as amended:, of the registrant: Form F-10 (File NoNos. 333-267323 and 333-283633).

EXHIBIT INDEX

99.1		Underwriting Agreement, dated February 19, 2025, by and among TransCanada PipeLines Limited, Deutsche Bank Securities Inc., J.P Morgan Securities LLC, SMBC Nikko Securities America, Inc., for themselves and as representatives of the several underwriters named therein, and, solely for purposes of Sections 2(a), 2(b) and 2(c) thereof, TC Energy Corporation.
99.2		Consent of Blake, Cassels & Graydon LLP.
99.3		Consent of White & Case LLP.


99.1			Schedule of earnings coverage calculations at March 31, 202 5 .

SIGNATURES

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

Date: February 21, 2025		TRANSCANADA PIPELINES LIMITED
Date: May 1, 2025	TRANSCANADA PIPELINES LIMITED
	By:	~~By:~~	/s/ ~~Jane~~Sean MP. ~~Brindle~~O'Donnell
		Name:	Jane M. Brindle
			Sean P. O'Donnell
		Title:	Vice-President, Law and Corporate Secretary
			Executive Vice-President, Strategy and Corporate Development and Chief Financial Officer
	By:		/s/ Yvonne Frame-Zawalykut
			Yvonne Frame-Zawalykut
			Vice-President and Corporate Controller

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