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Hydro One Networks Inc. has filed two leave-to-construct applications with the Ontario Energy Board, seeking approval for major transmission projects in northeastern and southwestern Ontario.

The proposals include the Northeast Power Line and the Longwood to Lakeshore Transmission Line, both 500-kilovolt transmission projects designed to expand system capacity and support growing electricity demand.

The Northeast Power Line would connect the Hanmer Transformer Station near Greater Sudbury to the Mississagi Transformer Station near Wharncliffe. The approximately $1.8 billion project is expected to increase transfer capability between regions by about 900 megawatts and is targeted for completion in 2029.

The Longwood to Lakeshore Transmission Line would link Strathroy-Caradoc to Lakeshore, adding roughly 550 megawatts of capacity, with completion expected in 2030.

Ryan Docherty, Executive Vice President of Capital Portfolio Delivery at Hydro One, said:

“Electricity demand in Ontario is increasing. These lines are part of one of the largest transmission line infrastructure investment portfolios in Canada that we are advancing together with First Nations.” He added: “Hydro One’s success is tied to Ontario’s success. Together, we are helping build a stronger and more self-reliant economy that advances local priorities, supports good jobs and drives economic growth.”

The projects are being advanced under Hydro One’s First Nation Equity Partnership Model, which allows nearby First Nations to invest up to a 50 per cent equity stake in transmission components.

The applications are subject to approval under Section 92 of the Ontario Energy Board Act, which governs transmission infrastructure development, including routing, design, and costs.

Hydro One Limited reported $3.4 billion in transmission and distribution investment in 2025 and employs approximately 9,600 workers across Ontario.

Source: ontarioconstructionnews.com