Ontario Construction News staff writer
Hydro One Networks Inc. has filed two leave-to-construct applications with the Ontario Energy Board (OEB) seeking approval to build major transmission projects in northeast and southwest Ontario.
Applications cover the Northeast Power Line and the Longwood to Lakeshore Transmission Line, both 500-kilovolt (kV) single-circuit transmission projects intended to expand Ontario’s electricity system capacity and support rising demand.
“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,” said Ryan Docherty. “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, while continuing to deliver value for the people of Ontario.”
The Northeast Power Line would run between Hanmer Transformer Station in Greater Sudbury and Mississagi Transformer Station near Wharncliffe. The approximately $1.8-billion project is expected to increase transmission transfer capability between northeast and northwest Ontario by about 900 megawatts and is scheduled for completion in 2029.
The Longwood to Lakeshore Transmission Line would connect Longwood Transformer Station in the Municipality of Strathroy-Caradoc to Lakeshore Transformer Station in the Municipality of Lakeshore. The roughly $1.2-billion project is expected to deliver about 550 megawatts of additional electricity capacity to southwest Ontario and support demand from the agri-business and manufacturing sectors. It is expected to be completed in 2030.
As part of Hydro One’s First Nation Equity Partnership Model, proximate First Nations will have the opportunity to invest in a 50 per cent equity stake in the transmission line component of each project. The company said it will continue working with First Nations partners throughout planning, development and construction.
Filing a leave-to-construct application under Section 92 of the Ontario Energy Board Act is required for approval to build or expand transmission infrastructure in the province. The applications include details on routing, design, timelines and project costs.
Hydro One Limited has invested $3.4 billion in its transmission and distribution networks in 2025 and employs about 9,600 workers across Ontario.
