Company: TCPA
Filing Date: 2025-10-06
Form Type: SUPPL
Source: 0001193125-25-231083
Chunk: 4

Company: TRANSCANADA PIPELINES LTD
Filing Date: 2025-10-06
Form: SUPPL
Chunk 4
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 SECURITIES                         |     |      |  8 |
| PLAN OF DISTRIBUTION                                   |     |      | 29 |
| ENFORCEABILITY OF CIVIL LIABILITIES                    |     |      | 30 |
| AGENT FOR SERVICE OF PROCESS                           |     |      | 31 |
| CERTAIN INCOME TAX CONSIDERATIONS                      |     |      | 31 |
| RISK FACTORS                                           |     |      | 31 |
| LEGAL MATTERS                                          |     |      | 34 |
| EXPERTS                                                |     |      | 34 |
| INTEREST OF EXPERTS                                    |     |      | 34 |
| RELIANCE ON EXEMPTIONS FOR WELL-KNOWN SEASONED ISSUERS |     |      | 34 |
| DOCUMENTS FILED AS PART OF THE REGISTRATION STATEMENT  |     |      | 34 |

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IMPORTANT NOTICE ABOUT INFORMATION IN THIS PROSPECTUS SUPPLEMENT

AND THE PROSPECTUS

This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of the Notes. The second part,
the short form base shelf prospectus dated December 5, 2024, gives more general information, some of which may not apply to the Notes. The short form base shelf prospectus is referred to as the “prospectus” in this prospectus
supplement. Except on the cover page and in the “Description of the Notes”, and unless the context otherwise requires, all references in this prospectus supplement to “we”, “us”, “our”,
“TCPL” or the “Corporation” refer to TransCanada PipeLines Limited and its subsidiaries, partnership interests and joint venture investments.

If the description of the Notes or any other information varies between this prospectus supplement, the prospectus and the documents incorporated by reference in the prospectus, you should rely on the information in this prospectus supplement. You should rely only on the information contained in this prospectus supplement or contained in, or incorporated by reference into, the prospectus or in any free writing prospectus we authorize and use in connection with the offering of the Notes. We have not, and the Underwriters have not, authorized any person to provide you with different information. If any person other than us provides you with different or inconsistent information, you should not rely on it. We and the Underwriters are not making an offer to sell these securities in any