LG-1 Hydroelectric Generating Station

Hydroelectric power plant, dike & dam

Our team completed this project five months ahead of schedule, building a 1,368 MW run-of-river hydroelectric power plant in James Bay based on strict environmental criteria.

The project involved the construction of these components:

• A dike
• A transitional dam
• A gravity dam
• A concrete sectional gravity dam to support a 45 m spillway equipped with eight floodgates
• A 330 m x 60 m x 60 m power plant

The geometry for the construction was particularly intricate, requiring multiple sets of formwork in light of the mandate’s short time frame. Most of the formwork, which covered 290,000 m² in total, could be prefabricated at a lower cost on site.

During this project, we cast in place 401,000 m³ of concrete, used 19,000 tonnes of rebar, installed four rail-mounted tower cranes and poured a record-breaking 10,500 m³ of concrete in a single day.

By deploying equipment and personnel 20 to 24 hours a day, six or seven days a week, we completed the project in 48 months, despite a particularly tight schedule.

Meeting strict criteria

We followed the strict compliance requirements of a particularly stringent environmental regulation, right to the letter.