Commissioned in October 2012, the 230/25-kV Limoilou substation is part of Hydro-Québec’s plan to develop the transmission system in the Québec metropolitan area. Designed to blend into its urban surroundings, it is located in the industrial area near Chemin de la Canardière and Boulevard Montmorency, in the borough of La Cité-Limoilou.
The Limoilou substation will serve the large urban areas of the Basse-Ville (lower town) and the Haute-Ville (upper town) of the city of Québec, which includes many commercial, residential and government buildings, including parliament hill. This major facility replaces older substations that have become obsolete, like Montcalm substation, dismantled in fall 2011, and Reine substation, which will be dismantled by 2017.
The underground line
Commissioning of the Limoilou substation was made possible in October 2012 by a temporary connection to the existing overhead transmission network with an overhead-underground junction.
In April 2012, in a spirit of collaboration, we set up an information and exchange committee (TIE) to find a permanent solution to connect Limoilou substation to the transmission network. The new underground transmission line is now in service and connects the Limoilou and Québec substations, located in the boroughs of La Cité-Limoilou and des Rivières, respectively. It is made up of two separate circuits: one 5.8 km long and the other 5.3 km long.
Work has begun in May 2014 and was completed in fall of 2015.