Central Ontario

Bowmanville to East GTA Power Line

Hydro One is investing in new infrastructure in the region to meet growing electricity needs and ensure safe and reliable power for your community.

Current project phase: Class Environmental Assessment (EA) ongoing

Expected completion date: 2032

Community open houses Contact
Arial view of Sudbury's Bell Park
TX lines

Building a stronger grid for Ontario's future

Project overview

Ontario's long-term demand for electricity is increasing, as is the investment required to strengthen the electricity system. The Independent Electricity System Operator (IESO) projects that demand in the East Greater Toronto Area (GTA) could rise faster than in other parts of the province. As an Ontario-based company, Hydro One continues to build new transmission lines to meet the growth in demand and is planning the proposed Bowmanville to East GTA Power Line. The project includes a 45-kilometre double-circuit 500-kilovolt transmission line from the Bowmanville Switching Station in Clarington to Cherrywood Transformer Station in Pickering. To support this work, a Class Environmental Assessment (EA) has been initiated. The proposed project will help meet the regional need for more electricity, improve resiliency and reliability of the grid and support long-term growth.

Partnership with purpose

Building as partners

Through Hydro One's industry-leading 50-50 First Nation Equity Partnership Model, First Nation partners will have the opportunity to invest in a 50 per cent equity ownership stake in the transmission line component of this project.

Together, we build a more self-reliant and secure electricity system to power growth in central Ontario.

Learn more
Indigenous transmission twoer artwork

Visit an open house near you

Current open houses

Ajax

Tuesday, April 14, 2026

4 to 8 p.m.

McLean Community Centre, 95 Magill Dr

Get directions

Solina

Wednesday, April 15, 2026

4 to 8 p.m.

Solina Community Hall, 1964 Concession Road 6

Get directions

Whitby

Thursday, April 23, 2026

4 to 8 p.m.

Brooklin Community Centre, 45 Cassels Rd E

Get directions

See the project study area

Project map

Hydro One prioritizes the use of existing transmission corridors wherever possible. As part of the Class EA process, we have identified a single viable route option for the proposed transmission line within an existing corridor. This route will be further studied by gathering environmental and technical data, along with input from Indigenous communities, community members, elected officials, interest groups and businesses.

Your feedback is important. We encourage you to view our interactive map and share your input.

View interactive map Download map (PDF)
Project map

See what's coming

Anticipated project schedule

Spring 2026
Notice of Commencement and community open house #1
Spring 2026
Environmental field studies and research to support the Class EA
Early 2027
Community open house #2
Spring 2027
Draft Environmental Study Report (ESR) for 30-day public comment period
Fall 2027
Finalize ESR to complete the Class EA
2028
Complete detailed design and obtain permits and approvals including Leave to Construct (Section 92) from the Ontario Energy Board
2029
Proposed construction start
2032
Line energized
*Dates are subject to change.

Guided by standards

Planning process

The project will follow the Class Environmental Assessment for Transmission Facilities in accordance with the Ontario Environmental Assessment Act. This is an important part of the planning process to assess potential natural, economic, social and cultural effects, determine measures to avoid or minimize impacts and evaluate route options.

In addition to Class EA, the project will require Ontario Energy Board approval under Section 92 (Leave to Construct) of the Ontario Energy Board Act.

People sitting and conversing

What we shared

Public consultation documents

Project notices

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What these documents mean

These documents summarize the studies, notices and resources shared during the consultation process. They explain how routes were evaluated, decisions were made and how we engaged with communities.

Answers at a glance

Frequently asked questions

How is the preferred route selected?

Hydro One is prioritizes the use of existing transmission corridors wherever possible. As part of the Class Environmental Assessment (EA) process, Hydro One has identified a single route option for the proposed transmission line. This route will be further studied and evaluated in accordance with all Class EA requirements.

The preferred route will be studied by collecting data from a variety of sources, including existing reports and plans, environmental field surveys, technical assessments and community feedback. The analysis balances criteria including natural environment, socio-economic environment, Indigenous culture, values and land use and technical requirements.

I received a letter indicating my property will be affected. How can I get more information?

At this stage of the project, our focus is on gathering information and feedback on the preferred route. Hydro One will be contacting all directly affected property owners along the preferred route to share information about the project.

Please contact us at Community.Relations@HydroOne.com or 1-877-345-6799 to ask questions or share your feedback.

Are there any safety concerns with electric magnetic fields?

Hydro One takes safety very seriously and we design and operate our equipment in accordance with all regulatory requirements. Health Canada has found no conclusive evidence of adverse effects caused by electric magnetic field (EMF) exposure from transmission lines. It also does not consider that any precautionary measures are needed regarding daily exposures to EMFs at extremely low frequencies. More information can be found here.

What is the need for this new transmission line?

In Ontario, the Independent Electricity System Operator (IESO) is responsible for ensuring that future energy needs are being met. According to the IESO, electricity demand in Ontario is expected to increase significantly over the next 25 years and demand in East GTA could rise faster than in other parts of the province. Pending project approvals, we will start construction in 2029 to support this growth and meet the completion date set by the IESO.

How will the project benefit the community?

As an Ontario-based company, Hydo One is investing today to ensure central Ontario has the electricity it needs tomorrow. Once built, the proposed Bowmanville to East GTA Power Line will increase the power available to communities while also supporting new businesses and industries as they connect to the grid. Every investment in Ontario's electricity system is an investment in local jobs and businesses, helping build a more prosperous province for all.

How is feedback used as part of the Class Environmental Assessment process?

Feedback is a critical part of our planning process. Our team will continue to have meetings, workshops, and community open houses to help us gather information that considers the interests and needs of the communities.

Local knowledge about the environment, including the natural and socio-economic environment, will be used to help evaluate the preferred route. Input from Indigenous communities, community members, elected official, property owners and other stakeholders will help us through this process to identify potential ways to avoid, mitigate or restore potential environmental effects from the project.

Please provide feedback by contacting the Hydro One team at: Community.Relations@HydroOne.com or 1-877-345-6799.

Contact us

We're here to help

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

1-877-345-6799

Land acknowledgement

Hydro One acknowledges that the Bowmanville to East GTA Power Line is proposed within the Williams Treaties and the Traditional Territory of the Mississaugas and Chippewas of the Anishinaabeg and is now home to many diverse First Nations, Inuit and Métis people. Hydro One understands that Indigenous Nations have been here since time immemorial and are stewards of what many refer to as Turtle Island.

We are all Treaty People and with a commitment to friendship and our pursuit of reconciliation, we are thankful to be welcomed on these lands as partners so we can improve on our past and energize our combined futures.

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