East–West Tie Transmission Project

Rank 2021


Industry Sector: Energy

Project Type: Transmission

Project Value: $777.1 million

Funding Source: Public

Federal Funding: $170 thousand through Indigenous Services Canada to hire a Project Manager to work with participating First Nations groups.

Provincial Funding: $777 million

Province: Ontario

City / Region: Municipality of Shuniah (near Thunder Bay) to Wawa

Estimated End Date of Substantial Completion: 2021

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 line corridor. The new East-West Tie will which connects 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.

In October of 2017, the Ontario Energy Board issued the Letter of Direction and Notice of Proceeding for the project. The targeted in-service date in 2020.

In early 2018, Hydro One filed for a Leave to Construct, presenting its own vision (Lake Superior Link) for the project. Acting on concerns that the project cost had risen to $777 million, Hydro One announced that it could build the project for $100 million less, by using an existing corridor through Pukaskwa National Park.

In January, it was announced that NextBridge would continue to lead the project. Construction of the project began in October.

Project Owner: NextBridge Infrastructure, a partnership with NextEra Energy Canada, Enbridge Inc., and Borealis Infrastructure

Project/Construction Manager: Quanta Services Inc.

Environmental Services: Burns & McDonnell

Other Key Players: Ontario Energy Board and the IESO; Golder; Hatch; Englobe

Supplier Other: Canam Group

Legal: Gowling WLG (counsel to NextBridge); Osler; Torys (acting for the owner)

Transmission Line Length (km): 450

Financing Detail: The East-West Tie Project is the first competitive transmission project in Ontario. NextBridge was selected in the process and designated to complete the necessary development work. Although NextBridge is a private company, the funding will be public, ratepayer dollars—subject to and approved by the Ontario Energy Board.

2020 Rank: 62

2019 Rank: 74

2018 Rank: 77

2017 Rank: 75

2016 Rank: 78

2015 Rank: 79


Platinum Elite (20+ Projects)
Platinum (10-19 Projects)
Gold (6-9 Projects)
Silver (3-5 Projects)
Bronze (1-2 Projects)