The Government of Quebec authorized the St-Jean project last february. Construction of the future substation and transmission line will begin in the coming months. Commissioning of the new equipment is planned in 2019.

The project

Commissioned in 1957, Saint-Jean substation is located in Dollard-des-Ormeaux, at the intersection of boulevards Saint-Jean and De Salaberry. It supplies part of the cities of Dollard-des-Ormeaux, Pointe-Claire, Kirkland and Beaconsfield, serving a total of about 10,000 customers. Given that the facility is over 50 years old, most of the substation’s 120/12-kV equipment needs to be replaced.

Hydro-Québec will refurbish the substation and convert the current voltage to 315/25-kV to meet future growth in demand. The planned substation, which will be built mainly on the site of the current substation, will be supplied by a new 315-kV line from Sources substation located less than 3 km away. This line will run through a right-of-way where power lines are already located.

This project is part of the transmission system upgrade on the island of Montréal to help meet increasing demand and ensure the long-term operability of facilities.

Saint-Jean project: Why a new substation?

Video duration : 0 min. 53 sec.

Saint-Jean project: Why a new line?

Video duration : 0 min. 46 sec.

Saint-Jean project: Why not run the line underground?

Video duration : 0 min. 57 sec.