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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 2022 and 2023.​​

Project overview

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

  • ​Disconnect Switch Replacement

  • Transformer Replacement

  • Current Transformer Replacement​

  • ​Privacy Fence Replacement

  • Breaker Replacement

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

Disconnect Switch Replacement

Fifteen disconnect switches in the Petrolia Substation have reached their end of life and need to be replaced. Disconnect switches are an important safety feature in a substation and are used to de-energize equipment in order to perform maintenance. This work began in May 2022 and is expected to be completed at the end of March 2023.

Transformer Replacement

EPCOR will be replacing a transformer within the Petrolia Substation that is nearing its end of life. This CVT transformer reduces high voltage so it can be used for metering electricity or operating protective measures within the substation. This replacement work will start in mid-March and take approximately two weeks to complete.

Current Transformer Replacement

EPCOR will be replacing a current transformer within the Petrolia Substation to increase the facility rating. Current transformers are used for metering electricity or operating protection measures with​in the substation. This replacement work will begin mid-June and is expected to complete early July 2023. 

Privacy Fence Upgrade​

EPCOR will be replacing the wooden privacy slats in the chain link fence around the substation. They will be replaced with plastic slats to ensure longevity. This work will start in early summer and is expected to take three weeks.​

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. ​​​