East-West Tie Transmission Project (EWT)



The East-West Tie Transmission Project (the Project) in northwestern Ontario will consist of a new, approximately 280-mile (450-km), double-circuit, 230-kilovolt (kV) transmission line.

The Project will generally parallel an existing double-circuit, 230-kV transmission line that connects the Wawa Transformer Station to the Lakehead Transformer Station near Thunder Bay, ON, including a connection midway in Marathon, ON. The project is being developed by NextBridge Infrastructure (NextBridge), a partnership between affiliates of Enbridge, NextEra Energy Canada and OMERS Infrastructure. 

The NextBridge partnership was established to participate in the Ontario transmission market. Collectively, the partnership submitted a proposal to the Ontario Energy Board (OEB) for the planning, development, construction, ownership, operation and maintenance of the East-West Tie (EWT) Transmission Project (the Project) in northwestern Ontario. On August 7, 2013 NextBridge was designated by the OEB to develop the EWT line and to file a Leave to Construct (LTC) application. NextBridge is committed to consulting with all interested community members, First Nations and Métis communities, elected officials and municipal staff, agencies, landowners and other stakeholders in a clear and mutually respectful manner throughout the life of the Project.

The Project is required to ensure the long-term reliability of the electricity supply in northwestern Ontario. Industrial activities in the area, particularly in the mining sector, are expected to drive strong electricity demand growth in the coming decade. Coupled with changes to the electricity supply in the area, the Independent Electricity System Operator (IESO) has identified supply needs for northwestern Ontario, which can be met with additional transmission or generation. The IESO analyzed these alternatives and recommended expansion of the EWT based on technical, economic and other considerations. On March 2, 2016, Ontario declared that the construction of the EWT is needed as a priority project.

Construction of the project began in September 2019 and is targeted to be complete by the end of March 2022.

For more information on the new East-West Tie project, please visit NextBridge.ca

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Project overview:

  • Type: Power transmission line
  • Status: Under construction
  • Length: 280 miles (450 km)
  • Capacity: 230 kV