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Visit our online community feedback forum to weigh in on the project today:


Hydro One is making important upgrades to a critical underground transmission line that serves Toronto’s downtown core.

The cable being replaced was installed in the 1950s and is approaching its end of life. This upgrade will help continue to provide power to the city’s most crucial institutions, including major banks, businesses, hospitals and universities.

Replacement of underground cables is subject to a Class Environmental Assessment (EA), which guides Hydro One’s planning process and helps identify and manage project effects and mitigation. Through this process, we are currently evaluating four alternative routes for the new cable and two different construction methods. Starting in the spring of 2018, we anticipate the Class EA process will continue until Winter 2020.

Pending project approvals, construction could begin in Spring 2021, with the cable expected to be in service by December 2024. View the latest Class EA process updates below and provide your feedback on the project using our online engagement forum.

image of Transmission towers in a corridor strung with high-voltage powerlines

Timeline: Public and Stakeholder Consultation for Class Environmental Assessment

  • SPRING2018
  • Advance notice with local elected officials

    Launch of Class Environmental Assessment

    Launch of online engagement

  • WINTER2019
  • Open House #1: Introduction to project

  •   FALL  2019
  • Open House #2: Provide update on information and feedback collected to date

  • SPRING2020
  • Open House #3: Present selection of preferred route
    Release of draft Environmental Study Report for review and comment

NOTE: All dates are anticipated and could change based on project feedback.
Previous dates have changed to accommodate a refined project study area and route options


Ongoing consultation opportunities including workshops, online engagement, pop-up events and individual meetings with First Nations and Métis communities, government agencies, interest groups, Business Improvement Areas (BIAs) and property owners will continue throughout this timeframe.

Project Approvals

Learn more about the Class EA being conducted to support the Power Downtown Toronto project.

Project Approvals
Public Consultation

Learn more about the Public Consultation initiatives we'll be conducting to support this project.

Public Consultation

View maps related to this project.

Frequently Asked Questions

Get answers to questions you may have about this project.

Frequently Asked Questions

Contact Us

For more information or to be added to the project contact list, please contact:

Dana Gardner
Community Relations
Hydro One Networks Inc.

Tel: 416-345-6799 or 1-877-345-6799

Fax: 416-345-6984