Hydro-Québec Appalaches Substation

Power Station Construction

Hydro-Quebec awarded us the mandate to build the Appalaches substation, a 735 KV station in Thetford Mines.

We completed the project in three phases. Phases I and II included the following work:

• Building a road linking the site to the main road
• Site leveling
• Site profiling
• Site drainage
• Building the station’s exterior foundations 
• Building three buildings

Phase III included the installation of these elements:

• High-voltage equipment
• Insulators
• Circuit breakers
• Selectors
• Surge protectors
• Current transformers
• Wiring
• Controls
• Instrumentation

The entire project required 6,600 m³ of concrete, 3,000 anchor bolts and 5.5 km of chain-link fencing.

Despite the magnitude of the project and the challenges posed by significant ground elevation changes, we completed the project in accordance with the client's requirements—and on schedule!

Major Excavation and Filling

We carried out major excavation and filling work to level the ground, which could vary in elevation by as much as 30 m in some places.