North Lethbridge 370S Substation Modification Project (7073)

Recent studies have shown the existing transmission system in the North Lethbridge area needs to be reconfigured to continue to provide a reliable supply of electricity to the City of Lethbridge. The AESO is proposing modifications to the existing North Lethbridge 370S substation, which include the addition of one 138 (kilovolt) kV circuit breaker. Circuit breakers are electrical switches inside a substation that protect substation equipment. Minor modifications of associated equipment are also required.

Key documents:

• North Lethbridge 370S Substation Modification Project Newsletter [Posted: March 24, 2021]

Notice of intent to consider for approval under the AESO's Abbreviated Needs Approval Process

The AESO intends to consider the need for the North Lethbridge 370S Substation Modification for approval under Section 501.3 of the ISO rules, Abbreviated Needs Approval Process, (ANAP Rule) on or after August 7, 2021.

Notice of Intention to Consider the Need for the North Lethbridge 370S Substation Modification Project for Approval under the AESO’s Abbreviated Needs Approval Process [Posted July 7, 2021]

• AESO Planning Report
• AESO Load and Generation Forecast
• TFO Project Cost Estimate
• AESO PIP Summary
• TFO Environmental and Land Use Effects Letter
• AESO Transmission Planning Criteria - Basis and Assumptions
• AESO Functional Specification

ANAP Approval Letter

North Lethbridge 370S Substation Modification Project ANAP Approval Letter [Posted: August 11, 2021]

Contact us

Please contact us directly with questions or comments about the need for this transmission reconfiguration at stakeholder.relations@aeso.ca or 1-888-866-2959.