Company: TCPA
Filing Date: 2025-10-08
Form Type: SUPPL
Source: 0001193125-25-233745
Chunk: 5

Company: TRANSCANADA PIPELINES LTD
Filing Date: 2025-10-08
Form: SUPPL
Chunk 5
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 of the daily exchange rate reported by the Bank of Canada was U.S.$0.7167 per $1.00.

|             |     | 2025 | Six Months Ended 
         June 30, |     | 2024 |        |     | 2024 |   Year Ended 
 December 31, |     | 2023 |        |     | 2022 |        |
|:------------|:----|:-----|-----------------:|:----|:-----|-------:|:----|:-----|-------------:|:----|:-----|-------:|:----|:-----|-------:|
| High        |     |      |           0.7376 |     |      | 0.7510 |     |      |       0.7510 |     |      | 0.7617 |     |      | 0.8031 |
| Low         |     |      |           0.6848 |     |      | 0.7235 |     |      |       0.6937 |     |      | 0.7207 |     |      | 0.7217 |
| Average (1) |     |      |           0.7098 |     |      | 0.7361 |     |      |       0.7302 |     |      | 0.7410 |     |      | 0.7692 |
| Period end  |     |      |           0.7330 |     |      | 0.7306 |     |      |       0.6950 |     |      | 0.7383 |     |      | 0.7888 |

| (1) | The average of the exchange rates on the last day of each month during the applicable period. |

FORWARD-LOOKING INFORMATION This prospectus supplement, the prospectus and the documents incorporated by reference in the prospectus include “forward-looking information” and “forward-looking statements” (collectively, “ forward-looking information”) within the meaning of securities laws, including the “safe harbor” provisions of the Securities Act(Alberta), the Securities Act(Ontario), the United States Private Securities Litigation Reform Act of 1995,Section 21E of the United States Securities Exchange Act of 1934,as amended (the “ Exchange Act”), and Section 27A of the United States Securities Act of 1933,