Lethbridge Transmission Development (7087)

Transmission system reinforcement is needed in the Lethbridge area to reliably serve the local demand for electricity.

The AESO’s preferred solution for the Lethbridge Transmission Development includes:

• Upgrading the 138 kV 207L transmission line by replacing the existing conductors with higher capacity 138 kV conductors.
• Adding or modifying associated equipment as required for the above transmission developments.

AltaLink Management Ltd. (AltaLink) is the transmission facility owner (TFO) in the area. While the AESO is responsible for identifying the need for transmission reinforcement and the proposed solutions to meet that need, TFOs are responsible for detailed siting and routing, constructing, operating and maintaining the associated transmission facilities within their service territories.

Key Documents

• Lethbridge Overview Newsletter | June 2026 [Posted: June 22, 2026]

Abbreviated Needs Approval Process | Notice of Consideration

The AESO intends to consider the need for the Lethbridge Transmission Development for approval under Section 501.3 of the ISO rules, Abbreviated Needs Approval Process, (ANAP Rule) on or after October 14, 2026. 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:

• System project costs are estimated to be $6M
• the AESO has completed a participant involvement program (PIP) in accordance with the guidelines in Alberta Utilities Commission Rule 007: Facility Applications;
• 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:

• AESO Forecast Appendix
• AESO Planning Report
• AltaLink and City of Lethbridge Cost Estimates
• AltaLink Environment and Land Use Assessment
• City of Lethbridge Environment and Land Use Assessment
• AltaLink Environmental Effects Screening Form
• AESO PIP Summary

Contact Us

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