Chamouchouane–Bout-de-l’Île Transmission Line

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Ranking for 2017: 34

Industry Sector: Energy

Specific Sector: Transmission

Range: $1 billion - $5 billion

Project Value: $1,400,000,000

Government Funds Involved: N/A

Funding Source: Public

Location: Saguenay to Montreal, Quebec

Estimated End Date of Substantial Completion: 2018

LEED: N/A


This project includes building a new 735 kV, 406-kilometre transmission line to increase its capacity to bring power from the north to the south. In the Lac-Saint-Jean region, four transmission lines bring power to the Chamouchouane and Saguenay substations from the north (from Baie-James on one side, and Côte-Nord on the other), while only three run southwards. This creates a funnel effect and limits the system’s capacity to bring power to the south, where the major load centres are located.

To reduce pressure on the system and mitigate this funnel effect, reinforcement between the Chamouchouane substation and the Montreal metropolitan loop is necessary. Construction began in 2015, with a completion date expected around September 2018.


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