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    Notice of Retirements - Keephills Unit 1 (KH1) effective December 31, 2021 and Sundance Unit 4 (SD4) effective April 1, 2022

    On September 28, 2021, TransAlta Generation Partnership notified the AESO pursuant to Section 22 of the Hydro and Electric Energy Act that Keephills Unit 1 (“KH1”) will retire at the end of day, December 31, 2021, and that Sundance Unit 4 (“SD4”) will retire on April 1, 2022.  TransAlta has previously indicated that effective January 1, 2022, SD4 will not run on coal and will only run on gas, which will reduce its maximum capacity to approx. 113 MW.  Asset ID KH1’s capacity and asset ID SD4’s capacity will be removed from the Current Supply & Demand page effective January 1, 2022 and April 1, 2022, respectively. 

    Please note that upon evaluation of the IT changes that would be necessary to reflect the above future MC change of Asset SD4 into our reporting, the AESO has determined it will not be cost effective and therefore prudent to implement the future MC change into our reports. The AESO has provided a notice at the bottom of each of the affected reports to advise of this. The MC change will be reflected in our reports once it becomes effective in real time on the effective date listed above.