Your browser is no longer supported

To get the best experience with, we suggest using a newer version of Internet Explorer/Edge, or using another supported browser such as Google Chrome.

ETS users may continue to log in using Internet Explorer 9 using the upper right hand link marked ETS Login.

    View all projects

    Castle Downs Substation Modification (2543)

    EPCOR Distribution & Transmission Inc. (EPCOR) has applied to the AESO for transmission system access to reliably serve the growing demand for electricity in the Edmonton area. EPCOR’s request can be met by the following solution:

    • Modify the existing Castle Downs substation, including adding fourteen 15 kilovolt (kV) feeder breakers.
    • Add or modify associated equipment as required for the above transmission developments.

    Abbreviated Needs Approval Process: Notice of Consideration

    The AESO intends to consider the need for the Castle Downs Substation Modification (Project) for approval under Section 501.3 of the ISO rules, Abbreviated Needs Approval Process, (ANAP Rule) on or after October 19, 2023. If stakeholders have any questions or concerns, please contact the AESO before this date.

    The AESO has determined that the Project is eligible for consideration under the ANAP Rule because the following eligibility criteria have been met:

    • total project cost is estimated to be less than $15M with all costs classified as participant-related in accordance with ISO tariff system-related;
    • the AESO has completed a participant involvement program (PIP) in accordance with the guidelines in Alberta Utilities Commission Rule 007;
    • the Project is not anticipated to result in significant environmental effects; and
    • no concerns or objections with the need for the Project have been raised. Prior to making its approval decision, the AESO will address additional stakeholder concerns that arise, if any.

    Supporting information about this Project is available in the following documents:

    Need Overview

    Latest updates

    • Oct. 4, 2023 Abbreviated Needs Approval Process: Notice of Consideration for the Castle Downs Substation Modification
    • Jun. 28, 2023 Need Overview: Need for the Castle Downs Substation Modification in the Edmonton area