Power Transmission Projects

315/25-kV Lachenaie Substation, 315/120-kV Pierre-Le Gardeur Substation and Tap Lines

To meet rapidly increasing demand in the RCMs of L'Assomption and Des Moulins, particularly in the Lachenaie sector of Terrebonne, Hydro-Québec plans to build two transformer substations.

Customers in southern Lanaudière are primarily supplied by Repentigny, Terrebonne, Mascouche, Saint-Sulpice and L'Assomption substations. In the short and medium term, these substations will no longer be able to meet demand growth. In addition, the 120-kV grid that supplies Terrebonne and Repentigny substations from 735/315/120-kV Duvernay substation in Laval is operating at full capacity, as is Duvernay substation itself.

Hydro-Québec's preferred solution is to build two new substations and short tap lines to connect them to the transmission grid:

• 315/25-kV Lachenaie substation, which will meet the growing demand and ease the load on neighbouring substations
• 315/120-kV Pierre-Le Gardeur substation, a source substation that will resolve the capacity issues at Duvernay substation. (A source substation serves substations that supply the distribution system.)

This project is part of Hydro-Québec's plan to upgrade the transmission system in the northeastern metropolitan Montréal.

To learn more about the project, consult the Documents section above.