Video: The Chamouchouane project in the Saguenay–Lac-Saint-Jean and Mauricie regions

Welcome to the jobsite!

Construction manager Jocelyn Jean invites us to the northernmost reaches of the Chamouchouane site.

Beginning at La Doré substation, the new power transmission line will run for over 200 km through Saguenay–Lac-Saint-Jean and the Mauricie.

Construction of the project, which takes place in the forest on many sites simultaneously, involves a small army of workers.

See the view from atop a tower supporting lines carrying 735 kV, the highest voltage level in Québec . . . Welcome to the jobsite!

Duration: 2 minutes 30 seconds

Over the next few months in the Lac-Saint-Jean area (section 1 of the line)

All stages of construction of the line have been completed in section 1. Site restoration will continue until late fall 2018. Expansion of Chamouchouane substation continues and will be completed in fall 2018.

For more information about the steps involved in the construction of a transmission line


An increase in traffic is expected on the access roads leading to Chamouchouane substation in the morning and at the end of the day.

Clearing the right-of-way – Lac-St-Jean


Le contenu qui suit est un diaporama d’images sur : Projet Mauricie en image

  • Installation of foundation in overburden for guyed tower
    This type of foundation weighs nearly 5 tonnes and supports a vertical load of nearly 250 tonnes, or 50 times its own weight.
    The foundation transfers the load to the ground the same way a snowshoe redistributes a person’s weight on the snow.
  • Backfilling of foundation
    To prevent the foundation from shifting under the weight of the tower and to avoid frost heave, backfill must be applied directly on top of it with great care.
  • Backfilling Inspection
    To make sure the foundation will stay in place for the next 100 years, the quality of the backfill material and its application is monitored throughout the backfilling process.
  • Installation of counterpoise wire
    In the event of a short circuit on the line, the current can travel through the tower to reach the ground. A metal wire, known as a counterpoise wire, sends the current quickly into the ground.
  • Construction of the line at Saguenay–Lac-Saint-Jean
    In the foreground is a guyed angle tower with three masts. Most of the towers on the line are V-shaped, but triple-masted towers are required wherever the line changes direction.

For more information

Info-project line: 1-877-535-3737

Information based on current planning and subject to change

Line route map for the Chamouchouane–Bout-de-l’Île project in the Saguenay–Lac-St-Jean region [PDF 521 Kb – in French only]