Major Projects

Hydro One's Current Transmission System Projects In Ontario.
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Every power line connects to people, businesses, and neighborhoods across the province. We are actively working in almost every community across the province to expand and upgrade the electricity system that will bring a cascade of benefits to homes, businesses and communities in Ontario.

The investments we are making in our electricity system will provide access to safe and reliable supply of electricity today, and for generations to come. This will create new opportunities for businesses to expand, for communities to grow, and for residents to be connected to what matters most in their everyday lives. Together, we are committed to energizing life for the people and communities across Ontario.


Photo of Hydro One workers on a transmission tower

The Planning Process

Each major project is unique, but they all follow a similar planning process. Explore our integrated planning approach here.

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St. Clair Transmission Line

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Chatham to Lakeshore Line

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Waasigan Transmission Line
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Photo of the Toronto skyline
Power Downtown Toronto
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Featured Projects:

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Power Downtown Toronto

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Lakeshore Transmission Stations Project

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Chatham to Lakeshore Line

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Image of the Waasigan Transmission Line Project logo

Waasigan Transmission Line

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Photo of a Hydro One transmission station during a rain storm with a double rainbow behind it

Class EA for Transmission Facilities

Some transmission system projects require a Class Environmental Assessment (EA) before they can proceed.

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