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​EPCOR is responsible for building, maintaining and upgrading the electrical transmission and distribution system in Edmonton. In order to continue delivering safe and reliable power to our customers, we are completing four maintenance projects within the Petrolia Substation.

​In May 2022 EPCOR began equipment replacement work in the Petrolia Substation, the work within the substation will be ongoing through 2023 and 2024.​​

Project overview

​EPCOR plans to complete five projects within the Petrolia Substation throughout 2023 and 2024: 

  • ​Disconnect Switch Replacement - completed

  • Transformer Replacement - completed

  • Current Transformer Replacement​ - completed

  • ​Privacy Fence Replacement - completed​

  • Grounding Upgrades

  • Breaker Replacement

​The February 2023 project notice update can be found here​.

Grounding Upgrades​

EPCOR will be upgrading the electrical grounding at the Petrolia Substation. This work will continue to ensure safe conditions within the substation and protect electrical equipment.  To complete these upgrades, new grounding connections will be installed along the substation fence. Work is expected to take place in late September for approximately one week.​

Breaker Replacement

The Breaker Replacement project has been delayed until Spring 2024. Additional information will be provided closer to the project start time.

Project map

​Petrolia Substation

Construction impacts

​Hours of work

The typical hours of construction will be 7:00 a.m. to 5:00 p.m. Monday to Friday. These timelines are an estimate and may change based on weather and construction condition. 

Work space

All work areas will take place within the substation walls.


These projects may be noisy at times. We will comply with the City of Edmonton’s Community Standards Bylaw for Noise Control. If it is necessary to temporarily exceed acceptable noise levels, we will work with the City of Edmonton to obtain the necessary permits.

Equipment and Vehicles On site

These projects will require a variety of vehicles and equipment within the Petrolia Substation, including cranes, hydrovac trucks, mini trenchers, delivery and hauling trucks and EPCOR vehicles.

Power Outages

Power outages are not required to complete these projects.


All work areas will be maintained in a safe and secure manner. All construction activities will be performed in accordance with the City of Edmonton’s bylaws, Occupational Health and Safety requirements and EPCOR’s strict health, safety and environmental procedures and guidelines.

Regulatory process

About the Alberta Utilities Commission

Alberta’s electrical system is regulated by the AUC. The AUC is an independent, quasi-judicial agency that ensures the delivery of Alberta’s utility services takes place in a manner that is fair, responsible and in the public interest.​

For more information about the AUC, please visit the AUC’s website. ​​​