East-West Transmission Tie

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Image Credit: NextBridge Infrastructure

Ranking for 2017: 76

Industry Sector: Energy

Specific Sector: Transmission

Range: $500,000,000 - $1 billion

Project Value: $600,000,000

Government Funds Involved: N/A

Funding Source: Private

Location: Thunder Bay to Wawa, Ontario

Estimated End Date of Substantial Completion: 2020

LEED: N/A


The East-West Tie Transmission Project is planned to consist of a new, approximately 447-kilometre, double-circuit, 230-kV transmission line, primarily paralleling an existing transmission corridor. The new East-West Tie will connect the Wawa Transformer Station to the Lakehead Transformer Station in the Municipality of Shuniah, near Thunder Bay, with a connection approximately mid-way at the Marathon Transformer Station. The need for the project was established by the Independent Electricity System Operator to: (i) increase capacity to meet expected electricity demand growth in Northwestern Ontario, (ii) provide two-way power flow across the tie, allowing more efficient use of generation resources, and (iii) create improved electricity system reliability, flexibility, and operation. Additionally, in March 2016, Ontario declared that the construction of the East-West Tie Transmission line is needed as a priority project. The Environmental Assessment and leave-to-construct applications are being prepared and are currently anticipated to be filed in 2017. The targeted in-service date is 2020.


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