Power Transmission Projects

New 230/25-kV Limoilou Substation

The upper town of the city of Québec is currently supplied by De la Reine and Montcalm substations, operating at 69/12 kV, and by Frontenac-1 and Frontenac-2 substations, rated 315/25 kV. Over the years, Hydro-Québec converted a portion of the 12-kV loads to 25 kV and transferred supply to the Frontenac substations. However, in the longer term, these substations will not be able to meet growth in electricity demand.

Therefore, Hydro-Québec plans to replace Montcalm and De la Reine substations by a new 230/25-kV substation.

Once its 12-kV loads have been converted to 25 kV, the existing Montcalm substation and its 69-kV line will be dismantled. At that time, the new substation will be commissioned. The 12-kV De la Reine substation loads, converted to 25 kV, will then be transferred to the new facility. Finally, the company will dismantle De la Reine substation and its 69-kV lines.

Work began in the middle of June and the substation is scheduled for commissioning in fall 2012. The project to build a new supply line has been postponed. In the meantime, Limoilou substation will be temporarily connected to the grid through an existing line. However, a temporary substation will have to be built on Boulevard Henri-Bourassa in 2012. This substation will remain in service for a maximum of five years.

For more information, you may consult the Project News bulletin in the Documents section above.