Company: TCPA
Filing Date: 2025-02-19
Form Type: SUPPL
Source: 0001193125-25-029207
Chunk: 121

Company: TRANSCANADA PIPELINES LTD
Filing Date: 2025-02-19
Form: SUPPL
Chunk 121
---
 and
territories of Canada have adopted substantively harmonized blanket orders, including Alberta Securities Commission Blanket Order 44-501 – Re Exemption from Certain Prospectus Requirements for Well-Known Seasoned Issuers, as varied by Alberta Securities Commission Variation of Blanket Order 44-501 (collectively with the equivalent local blanket orders in each of the other provinces and
territories of Canada, as amended, modified or varied, the “WKSI Blanket Orders”). This prospectus has been filed by the Corporation in reliance upon the WKSI Blanket Orders, which permit “well-known seasoned issuers” or
“WKSIs” (as such terms are defined in the WKSI Blanket Orders), to file a final short form base shelf prospectus as the first public step in an offering, and exempt qualifying issuers from certain disclosure requirements relating to such
final short form base shelf prospectus. As of the date hereof, the Corporation has determined that it qualifies as a “well-known seasoned issuer” under the WKSI Blanket Orders.

DOCUMENTS FILED AS PART OF THE REGISTRATION STATEMENT

The following documents have been or will be filed with the SEC as part of the registration statement of which this prospectus forms a
part: the documents referred to under “Documents Incorporated by Reference”; consent of KPMG LLP; consent of Blake, Cassels & Graydon LLP; consent of White & Case LLP; powers of attorney from directors and officers
of the Corporation; the Indentures; Statement of Eligibility of The Bank of New York Mellon on Form T-1 under the U.S. Unsubordinated Debt Indenture; and Statement of Eligibility of the Computershare
Trust Company, N.A. on Form T-1 under the U.S. Subordinated Debt Indenture.

34

U.S.$ TransCanada PipeLines Limited % Fixed-to-FixedRate Junior Subordinated Notes Due 2065 PROSPECTUS SUPPLEMENT February , 2025 Joint Book-RunningManagers

| Deutsche Bank Securities |     | J.P. Morgan |     | SMBC Nikko |