Power Transmission Projects

New 230/25-kV Limoilou Substation and
230-kV Supply Line

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.

Selection of the new substation's location and the transmission line route will be based on Hydro-Québec's environmental assessment method for lines and substations. Surveys of the host environment will be conducted in accordance with this proven systematic approach.

The public information and consultation phase will take place between fall 2008 and spring 2009. Hydro-Québec hopes to begin construction work in fall 2010, with a view to commissioning in 2012.

For more information, you may consult the information bulletins (in French) by clicking on the links at the top right of this page.