Hydro One plans to replace critical underground transmission lines that serve Toronto’s downtown core.
The cables being replaced were installed in the 1950s and are approaching their end of life. This work will help continue to provide power to our city’s most crucial institutions, including major banks, businesses, hospitals and universities.
Since the Class Environmental Assessment was initiated for this project in May 2018, we have been reviewing environmental and technical data, and collecting feedback and input on alternative routes and construction methods. Based on this analysis and information, we have now selected our preferred route, Tunnel Route 1, shown on the map below.
Click to enlarge (.PDF)
Pending project approvals and permits, construction is planned to begin in Spring 2021 and be completed in December 2024. View the latest updates using our
online engagement forum.