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Hydro One's CurrentTransmission System Projects In Ontario.

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The transmission system is Ontario’s electricity highway. Through it we send vast amounts of electricity from hydroelectric, wind, solar, nuclear, and natural gas generators over long distances to the Local Distribution Companies (LDCs) that power Ontario homes and businesses.

We continue to make investments to maintain and upgrade our system. We work with communities to ensure that our transmission system has sufficient capacity to deliver a safe and reliable supply of electricity.

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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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Power Downtown Toronto

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Featured Projects:

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Power Downtown Toronto

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Lakeshore Transmission StationsProject

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Chatham to Lakeshore Line

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Waasigan Transmission Line

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Where are wecurrently working?

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Class EA for Minor Transmission Facilities

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

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