Power Transmission Projects

230/25-kV Limoilou Substation and 230-kV Québec–Limoilou Underground Line

The substation

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. Developed to integrate 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, including many government (parliament hill), commercial and residential buildings. This important facility replaces older substations that have become obsolete, like Montcalm substation, dismantled in fall 2011. The Reine substation 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 TIE is a group with the mission of identifying a favorable proposal of optimized routes. It is composed of different local stakeholders affected by the project: residents, local city councillors, the Direction régionale de santé publique de la Capitale-Nationale (regional public health board), the boroughs of La Cité-Limoilou, Les Rivières and Charlesbourg, as well as the city of Québec.

Commissioning of the new line is planned for fall 2015.

For more information, consult the "Présentation des tracés optimisés" bulletin (in French only) and other documents in the section above.