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    GUOC Rates

    The owner of a proposed generating unit or aggregated generating facility with a maximum capability of greater than 1 MW is required to pay a Generating Unit Owner’s Contribution (GUOC). For more information, see Section 7 of the ISO Tariff, Generating Unit Owner’s Contribution.

    GUOC Rates

    Planning Region

    Current GUOC Rate*
    effective Jan 1, 2024













    *GST will be applied to the GUOC payment.


    To view the geographic areas of each region, see the Planning Region Map.

    GUOC Estimate Calculator

    To estimate the amount of GUOC that will be required for the current or GUOC rates, enter the planning region and maximum capability in the corresponding calculator below. For more information about the calculation of GUOC, see ID #2024-014T, Generating Unit Owner’s Contribution Calculator.

    Current GUOC Rates

    Contribution Estimate: $2300.01

    This online calculator is designed for convenience and should be used for informational purposes only. The accuracy of the calculator and its applicability to particular cases is not guaranteed. The AESO will issue a GUOC assessment and final invoice which may differ from the estimate generated by this online calculator. The AESO makes no claims, promises, or guarantees regarding the accuracy or completeness of the information provided by this online calculator, and expressly disclaims liability for errors or omissions. Consequently, any reliance placed on the information provided herein is at the user’s sole risk.

    GUOC Rates and Yearly Update Process

    The AESO has determined the GUOC Rates it will propose in the 2024 ISO tariff rates update application, expected to be filed for approval by the Alberta Utilities Commission (AUC) in late 2023. The proposed 2024 rates reflect no change from the current 2023 GUOC rates, for all planning regions. The balance of load and generation in all regions remains largely the same as last year. There are more projects meeting AESO's inclusion criteria, however, they have not materially changed the situation in any of the regions.

    Additional information on the GUOC Rate update process is available in the document link below.


    If you have questions about the GUOC Rates, please contact