Company: TCPA
Filing Date: 2025-10-08
Form Type: SUPPL
Source: 0001193125-25-233745
Chunk: 26

Company: TRANSCANADA PIPELINES LTD
Filing Date: 2025-10-08
Form: SUPPL
Chunk 26
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% per annum
from October 9, 2025, or the most recent Interest Payment Date to which interest has been paid or duly provided for.

Interest on the
Notes will be payable quarterly in arrears on February 1, May 1, August 1 and November 1 of each year (each such date, an “Interest Payment Date”), commencing on February 1, 2026 (long first coupon), subject
to deferral as described under “—Deferral Right”. Interest payments will be made to the persons or entities in whose names the Notes are registered at the close of business on the date (whether or not such day is a
business day) fifteen calendar days immediately preceding the relevant Interest Payment Date.

Interest on the Notes will be calculated on
the basis of a 360-day year consisting of twelve 30-day months and, for any period shorter than three months, on the basis of the actual number of days elapsed per 30-day month. For the purposes of disclosure under the Interest Act(Canada), and without affecting the interest payable on the Notes, whenever the interest rate on the Notes is to be calculated on the basis
of a period of less than a calendar year, the yearly interest rate equivalent for such interest rate will be the interest rate multiplied by the actual number of days in the relevant calendar year and divided by the number of days used in
calculating the specified interest rate.

If an Interest Payment Date, redemption date or the Maturity Date falls on a day that is not a
business day, the payment of interest, principal or premium due on such day will be postponed to the next business day, and no further interest, principal or premium, as applicable, will accrue in respect of such postponement.

Listing and Trading

Wewill
applyto list the Notes on the NYSE. If approved for listing, trading on the NYSE is expected to commence within 30 days after the Notes are first issued.The Notes are expected to trade “flat”, meaning that purchasers will
not pay and sellers will not receive any accrued and unpaid interest on the Notes that is not included in the trading price.

Specified Denominations

The Notes will be issued only in minimum denominations of U.S.$25and integral multiples of U.S.$25in excess thereof.

S-17

Additional Notes We may from time to time, without notice to, or the consent of, the holders of the Notes, create and issue additional Notes under the Indenture,