Contract ID.: FT18311 Amendment No: 3 FORM OF TRANSPORTATION SERVICE AGREEMENT This Transportation Service Agreement (Agreement) is entered into by Great Lakes Gas Transmission Limited Partnership (Transporter) and TransCanada PipeLines Limited...

Exhibit 99.1

Contract ID.: FT18311 Amendment No: 3 FORM OF TRANSPORTATION SERVICE AGREEMENT This Transportation Service Agreement (Agreement) is entered into by Great Lakes Gas Transmission Limited Partnership (Transporter) and TransCanada PipeLines Limited (Shipper). WHEREAS, Shipper has requested Transporter to transport Gas on its behalf and Transporter represents that it is willing to transport Gas under the terms and conditions of this Agreement. NOW, THEREFORE, Transporter and Shipper agree that the terms below constitute the transportation service to be provided and the rights and obligations of Shipper and Transporter. 1. EFFECTIVE DATE: November 01, 2020 2. CONTRACT IDENTIFICATION: FT18311 3. RATE SCHEDULE: FT 4. SHIPPER TYPE: Other 5. STATE/PROVINCE OF INCORPORATION: Alberta 6. TERM: November 01, 2015 to October 31, 2021 Right of First Refusal: Regulatory (in accordance with Section 6.16 of the General Terms and Conditions of Transporter's FERC Gas Tariff) 7. EFFECT ON PREVIOUS CONTRACTS: This Agreement supersedes, cancels and terminates, as of the effective date stated above, the following contract(s): Service Agreement dated November 01, 2019 with Contract Identification FT18311. 8. MAXIMUM DAILY QUANTITY (Dth/Day): Please see Appendix A for further detail. 9. RATES: Unless Shipper and Transporter have agreed to a rate other than the maximum rate, rates shall be Transporter’s maximum rates and charges plus all applicable surcharges in effect from time to time under the applicable Rate Schedule (as stated above) on file with the Commission unless otherwise agreed to by the parties in writing. Provisions governing a Rate other than the maximum shall be set forth in this Paragraph 9.

Contract ID.: FT18311 Amendment No: 3 10. POINTS OF RECEIPT AND DELIVERY: The primary receipt and delivery points are set forth on Appendix A. 11. RELEASED CAPACITY: N/A 12. INCORPORATION OF TARIFF INTO AGREEMENT: This Agreement shall incorporate and in all respects be subject to the "General Terms and Conditions" and the applicable Rate Schedule (as stated above) set forth in Transporter's FERC Gas Tariff, Third Revised Volume No. l, as may be revised from time to time. Transporter may file and seek Commission approval under Section 4 of the Natural Gas Act (NGA) at any time and from time to time to change any rates, charges or provisions set forth in the applicable Rate Schedule (as stated above) and the "General Terms and Conditions" in Transporter's FERC Gas Tariff, Third Revised Volume No: 1, and Transporter shall have the right to place such changes in effect in accordance with the NGA; and this Agreement shall be deemed to include such changes and any such changes which become effective by operation of law and Commission Order, without prejudice to Shipper's right to protest the same. 13. MISCELLANEOUS: No waiver by either party to this Agreement of any one or more defaults by the other in the performance of this Agreement shall operate or be construed as a waiver of any continuing or future default(s), whether of a like or a different character. Any controversy between the parties arising under this Agreement and not resolved by the parties shall be determined in accordance with the laws of the State of Michigan. 14. OTHER PROVISIONS (As necessary): It is agreed that no personal liability whatsoever shall attach to, be imposed on or otherwise be incurred by any Partner, agent, management official or employee of the Transporter or any director, officer or employee of any of the foregoing, for any obligation of the Transporter arising under this Agreement or for any claim based on such obligation and that the sole recourse of Shipper under this Agreement is limited to assets of the Transporter. Upon termination of this Agreement, Shipper's and Transporter's obligations to each other arising under this Agreement, prior to the date of termination, remain in effect and are not being terminated by any provision of this Agreement.

Contract ID.: FT18311 Amendment No: 3 15. NOTICES AND COMMUNICATIONS: All notices and communications with respect to this Agreement shall be in writing by mail, e-mail, or other means as agreed to by the parties, and sent to the addresses stated below or to any other such address(es) as may be designated in writing by mail, e mail, or other means similarly agreed to: ADMINISTRATIVE MATTERS: Great Lakes Gas Transmission Limited TransCanada PipeLines Limited Partnership 000 0xx Xxxxxx XX Xxxxxxxxxx Xxxxxxxxxx Xxxxxxx, XX X0X 0X0 000 Xxxxxxxxx Xxxxxx, Xxxxx 000 Xxxxxxx, XX 00000-0000 Attn: Xxxx Xxxxxxxx AGREED TO BY: GREAT LAKES GAS TRANSMISSION LIMITED PARTNERSHIP TransCanada PipeLines Limited By: Great Lakes Gas Transmission Company By: Xxx Xxxxxxxx By: DocuSigned by Xxx Xxxxx Title: Director, Transportation Accounting and Contracts BDBBA2270D4F1 Title: Vice President By: DocuSigned by Xxxxxx Xxxxxxxx TSC07F2232C2.Title: Director, Eastern Markets Legal DS NS DS Content.

APPENDIX A CONTRACT IDENTIFICATION: FT18311 Date: November 01, 0000 Xxxxxxxxxx Xxxxxxxx Dated: November 01, 2019 Shipper: TransCanada PipeLines Limited Maximum Daily Quantity (Dth/Day) per Location: Point(s) Point(s) of Begin End of Primary Primary Date Date Receipt Delivery MDQ 11/1/2015 3/31/2016 XXXXXXX RECEIPT SAULT STE XXXXX TCPL 12,132 4/1/2016 10/31/2019 XXXXXXX RECEIPT SAULT STE XXXXX TCPL 12,132 11/1/2019 10/31/2020 XXXXXXX RECEIPT SAULT STE XXXXX TCPL 18,903 11/1/2020 10/31/2021 XXXXXXX RECEIPT SAULT STE XXXXX TCPL 18,903