The West Toronto Transmission Line Relocation project is needed to support
Metrolinx’s planned electrification of the Barrie Rail Corridor. This project will relocate existing
overhead lines which interfere with planned Metrolinx infrastructure between St. Clair Avenue West and
Bowie Avenue, just north of Eglinton Avenue West.
Initially, three open-cut route alternatives were identified within city
streets to relocate this critical electrical infrastructure. Since project inception, we have been
reviewing environmental and technical data, and collecting feedback on alternative routes and
construction methods. Based on this analysis and information, a deep, underground tunnel route has now
been identified as the preferred route.
The majority of the proposed tunnel would run underneath Caledonia Road at a
depth of between 10 to 40 metres underground and would connect into new junction stations located at
each end of the tunnel at Wiltshire TS and Castlefield Ave. A junction station facilitates the
transition from overhead to underground lines. These sites would also serve as tunnel shafts for
construction and access points for ongoing maintenance and operational needs.
Hydro One is in the beginning, planning phases of the project. Once the required approvals are
completed and it is anticipated that construction could begin in 2027 and be completed and in-service by
2031. The exact length of time work will take place will be further refined as we progress with project
planning.
