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

    Chapel Rock-to-Pincher Creek Transmission Development (7064)

    With the evolving electricity landscape, the AESO has worked diligently to ensure the previously approved transmission development in southwest Alberta continues to be the right plan for the transmission system for all Albertans. Specifically, the need for this transmission development reinforcement was approved by the Alberta Utilities Commission (AUC) as part of the Southern Alberta Transmission Reinforcement Needs Identification Document (NID) on September 8, 2009. The NID, including all appendices, engagement material and amendments approved by the AUC are located in “Archived Materials” below.

    The Chapel Rock–to–Pincher Creek Transmission Development project includes:

    • Construction of the previously approved Chapel Rock substation will proceed.
    • One new 240 kV transmission circuit will connect the new Chapel Rock substation to one of two existing substations – either Castle Rock Ridge or Goose Lake. Both substations present technically viable solutions. Based on additional work as part of the planning process, and taking stakeholder feedback into consideration, it was determined that a second 240 kV transmission line is not required within the next five-10 years and will remain as part of our long-term plans for the area.

    Key materials

    <iframe width="560" height="315" src="" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

    This video has been updated to reflect the current transmission solution proposed by the AESO. To view our newsletter please click here.  To view the original video please click here

    The Chapel Rock-to-Pincher Creek transmission development will also contribute to the restoration of the Alberta-British Columbia intertie to, or near to, its path rating. Please visit for more information on the Alberta-British Columbia Intertie Restoration project.

    Archived material

    Archived material

    Contact us

    If you have any suggestions, questions or concerns please contact Stakeholder Relations at or 1-888-866-2959.

    Latest updates

    • Sep. 21, 2018 Chapel Rock–to–Pincher Creek Transmission Development Update (Newsletter)