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Downtown Calgary
Transmission Reinforcement Project

Project Overview

On November 30, 2017, ENMAX filed an application with the Alberta Utility Commission (AUC) for a new 138 kV underground transmission line between ENMAX No. 2 Substation (3120 – 9 Street SE) and ENMAX No. 8 Substation (903 – 4 Avenue SW). On November 9, 2018, the AUC approved the Project. 

The Project provides reinforcement of the 138 kV transmission system in Calgary's downtown area, and consists of the following:

Transmission line

  • Construct a new 138 kV single circuit underground transmission line from ENMAX No. 2 Substation to ENMAX No. 8 Substation downtown.


  • ENMAX No. 2 Substation: Connect the new transmission line to the existing switchgear.
  • ENMAX No. 8 Substation: Modify the existing switchgear to connect the new transmission line. 

Important Documents

Pre-Construction Engagement Collateral

Completed Construction Notices

Project status

ENMAX filed an application with the Alberta Utilities Commission (AUC) for the proposed work on November 30, 2017. 

The AUC issued a decision approving the project on November 9, 2018 and construction is planned to begin in early 2019.

For information on the AUC and its processes and its decision, click here.


Email: Power Customer Relations
Phone: 403-514-3990

All customers are free to purchase natural gas services from the default supply provider or from a retailer of their choice and to purchase electricity services from the regulated rate provider or from a retailer of their choice. The delivery of natural gas and electricity to you is not affected by your choice. If you change who you purchase natural gas services or electricity services from, you will continue receiving natural gas and electricity from the distribution company in your service area. For a current list of retailers you may choose from, visit www.ucahelps.gov.ab.ca or call 310-4822 (toll free in Alberta).

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