Central Ontario

Bowmanville Switching Station Expansion

As industry and business grows in Ontario, so does the need for safe, clean and reliable power. In a report published in February 2024, the Independent Electricity System Operator (IESO) identified the need to connect new generation and create new transmission capacity for future growth through regional planning initiatives.

Expected completion date: 2032

Current project phase: Planning - Class Environmental Assessment

Read and comment on the draft ESR
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Project overview

The project will include the proposed expansion of the 500-kilovolt Bowmanville Switching Station to connect Ontario Power Generation’s Darlington New Nuclear Project to Hydro One’s transmission network and ensure a reliable supply of electricity to meet increased energy demands.

Project map

Planning process

Minimizing the effects of our projects and operations on the environment is important to us. The planning of this project will follow the Class Environmental Assessment for Minor Transmission Facilities (2022) in accordance with the Ontario Environmental Assessment Act. This planning process applies to transmission infrastructure projects that are carried out routinely and have predictable environmental effects that can be readily managed.

Rooted in engagement and consultation, the Class EA ensures that potential natural, economic, social and cultural effects are thoroughly considered before a project begins. Engagement with Indigenous communities, landowners, businesses, stakeholder groups, government agencies and other interested parties is critical to help us plan the project.

Learn about the EA process
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Public Consultation documents

Draft Environmental Study Report (ESR)

The 30-day comment period for the draft Environmental Study Report is now open. Hydro One values community input and will carefully consider all comments. Any concerns raised will be addressed before the ESR is finalized and submitted to the Ministry of Environment, Conservation and Parks (MECP). Once complete, the final ESR will be posted on this website.

To learn more about providing your input read our notice of completion of the draft Environmental Study Report.

Read the draft ESR Read notice of draft ESR

Our draft Environmental Study Report is available to view in person at:

Bowmanville Library

163 Church Street

Bowmanville, ON L1C 1T7

We're here to help

To provide comments or to be added to the project contact list, please connect with us

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