Patriotes substation and 315-kV supply line

In anticipation of construction, geotechnical studies and other preliminary work—including excavation, compacting and earthwork—were carried out at the substation site. The next phase will consist of the construction of the civil engineering structures, including the substation building and the concrete plinths supporting the substation equipment, in addition to the transformers, which lower the voltage for distribution to customers.

The construction of the supply line will begin with laying the tower foundations. The towers will be assembled on the ground and then erected, followed by conductor unwinding. The line will be inspected before it is commissioned. Finally, site restoration work will be carried out, which includes cleaning up the work areas, leveling the ground, filling ruts, dismantling temporary access roads and reseeding the site if needed.

The civil engineering work on the underground distribution lines will be undertaken in three sections, each with its own timetable: Saint-Eustache, Deux-Montagnes and Sainte‑Marthe‑sur‑le‑Lac.

The planned work includes excavation, backfilling, and pouring concrete in the public right-of-way so that duct banks and cable vaults can be put in. It also includes drilling to install the concrete-encased ducts and site restoration.

Once the civil engineering work has been completed, Hydro‑Québec will lay the cables.