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    Transmission Must-Run service

    Transmission Must-Run (TMR) is generation that is required to be online and operating at specific levels in parts of the province's electricity system to compensate for insufficient local transmission infrastructure relative to local demand. TMR is used to ensure reliability until adequate transmission infrastructure is built in that local area.

    Given the location-specific nature of TMR, only specific units in Alberta may be required to provide TMR. The AESO may enter into a contract with these units when long-term requirements for TMR are identified.

    TMR procurement competition

    Ancillary services, such as TMR, keep the transmission system running reliably and securely. These services are procured by the AESO in a fair, open, efficient, and competitive manner to the extent that a procurement is contestable between market participants.

    Following the identification of a foreseeable need for TMR service in the AESO’s Grande Prairie planning area, a procurement competition to enter into a commercial agreement for TMR service was conducted in two stages, based on the procedure set out in Appendix B of the ISO Tariff:

    • Stage 1: Request for Expressions of Interest (REOI)
    • Stage 2: Request for Proposals (RFP) or bilateral negotiation


    • REOI stage<br>March 7 – March 21, 2022

      The REOI staged opened on March 7 and closed on March 21, 2022.

      A virtual REOI stakeholder information session was hosted on March 14, 2022.

      The REOI stage sought to identify market participants interested in competing for a commercial agreement(s) to provide TMR service in the AESO’s Grande Prairie planning area. Participation in the REOI stage was strongly encouraged for market participants who wished to participate in stage 2 of the procurement competition. REOI documents are included in the section “TMR service procurement competition resources.”

    • RFP stage<br>April 4 – May 17, 2022

      The AESO, following consultation with the Market Surveillance Administrator (MSA) after the REOI stage was complete, determined that the REOI was contestable; therefore, an RFP was issued and managed through a procurement site called Bonfire (Bonfire Site).

      The RFP stage of the competition opened on April 4, 2022, and closed on May 17, 2022. Following the evaluation of proposals, a successful bidder(s) will be selected in late Q2 2022.


    TMR service procurement competition resources

    Please direct any comments or questions about the TMR procurement competition to