In 2014, Hydro-Québec informed the City of Dollard-des-Ormeaux that it planned to build a new 315-25 kV Saint-Jean substation and install a new 315 kV supply overhead power line of about 3 km. This overhead line will be located in the same hydroelectric corridor as the current 120 kV line. The project aims to ensure the sustainability of the St-Jean substation while meeting the future growth of electrical load in the West Island of Montréal.
This project is necessary because the 120-12 kV substation is now at the end of its service life and Hydro-Québec must meet the growing demand for electricity in the western sector of the Island of Montréal.
Built in 1957, Saint-Jean substation, with a capacity of 120-12 kV, serves approximately 100,000 customers in the municipalities of Dollard-des-Ormeaux, Pointe-Claire, Kirkland, and Beaconsfield.