Thornton 2091S Substation Upgrade (3076)

ATCO Electric Ltd. (ATCO) has applied to the AESO for transmission system access to serve growing demand for electricity in the Grande Prairie area. ATCO’s request can be met by the following solution:

• Upgrade the existing Thornton 2091S substation, including adding one 144/25 kilovolt (kV) transformer and one 144 kV circuit breaker.
• Add or modify associated equipment as required for the above transmission developments.

Needs Identification Document

Thornton 2091S Substation Upgrade Needs Identification Document [Posted: October 27, 2026]

Appendix A - Connection Assessment
Appendix B - Capital Cost Estimate
Appendix C -;AESO PIP
Appendix D - DFO Distribution Deficiency Report
Appendix E - Environmental Effects Screening Form

Need Overview

• Thornton 2091S Substation Upgrade [Posted: May 6, 2026]