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Mainwaring Substation Upgrade

Mainwaring Substation Upgrade

We’re working to upgrade the Mainwaring Substation to increase electrical system reliability, replace near end-of-life equipment, and prepare for growth.

Mainwaring Substation Soil and Groundwater Studies - May 2022

We will be studying soil and groundwater conditions on the south side of the Mainwaring Substation site outside the substation fence on May 24 and 25, 2022. If groundwater is encountered, additional activities will take place on May 26 and 30, 2022.

Specifically, the work that we will be doing is as follows:

  • May 24: Confirm the location of underground utilities.
  • May 25: Expose the utilities and drill boreholes to both determine if there is groundwater and identify the types of soil that are in the area.
  • May 26: Develop a monitoring well (if groundwater is encountered).
  • May 30: Sample groundwater (if groundwater is encountered).

All work will take place during regular construction working hours.

If you have any questions or comments, please contact us.

What's new

Application for a Certificate of Public Convenience and Necessity submitted

The Mainwaring Substation Upgrade is subject to regulatory review by the BC Utilities Commission (BCUC).

We submitted our Application for a Certificate of Public Convenience and Necessity (CPCN) to the BCUC on November 5, 2021. The application provides a detailed description of the project and project need.

The BCUC accepted the application and has commenced its review including establishing a public hearing process and a regulatory schedule. The BCUC Order establishes the review and provides information on how to participate in the review.

Mainwaring Substation provides reliable electricity supply to over 60,000 homes and businesses in East Vancouver, and it needs some upgrades to replace aging equipment.

Key components of the project include replacing two transformers and associated equipment, construction of a new two-story GIS building to house new duct banks, and removal of existing outdoor feeder sections. After project completion, landscaping at the site will be completed, as required. A rendering of the new building on the southwest corner of the substation is shown below.

Mainwaring substation post-implementation

We expect site preparation to start in late 2022 with the main construction work starting in 2023. The expected in-service date is summer 2026.

Mainwaring Substation is a distribution substation built in the 1950s. The substation is located at 6450 Inverness Street at the intersection of Inverness Street and 47th Avenue. The closest major intersection is Knight Street and 49th Avenue.

Mainwaring Substation takes electricity at a higher voltage (230 kilovolts) and converts to 12 kilovolts to supply power to homes and businesses in the neighbourhood.

Over 60,000 customers are being served by Mainwaring substation. The current area Mainwaring substation serves is west to Cambie Street, east to Boundary Road, and north to 12th Avenue.

This upgrade will provide increased reliability to the electrical system and replace aging equipment that's nearing end-of-life. This upgrade will also prepare for future growth in the area by modifying the substation layout to better prepare for future upgrades.

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