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    Status of Keephills Unit 1 (KH1) and Sundance Unit 4 (SD4) – Reduction in Maximum Capability, effective January 01, 2022

    TransAlta Corporation has notified the AESO of their decision to cease active coal mining operations at the Highvale Mine by December 31, 2021, resulting in gas-only operations for the Sundance and Keephills generating assets. In this regard, TransAlta Corporation assets Keephills 1 (KH1) and Sundance 4 (SD4) are not expected to be fully converted from coal to gas by the end of 2021, and as a result, their maximum capabilities will be permanently decreased as follows (effective January 01, 2022):

    • maximum capability for Keephills 1 will decrease from 395 MW to approx. 70 MW.
    • maximum capability for Sundance 4 will decrease from 406 MW to approx. 113 MW.

    AESO IT systems will be updated to reflect these changes in the coming weeks.