120/25-kV substation in Val‑des‑Monts and 120-kV supply line

Project overview

To meet the growing demand for electricity in the region and improve the reliability and quality of the power system, Hydro‑Québec conducted draft-design studies from 2020 to 2023 to build a new 120/25‑kV substation in Val‑des‑Monts.

To supply the substation, which will be located on Chemin de la Savane, a 4.7 km-long, 120-kV tap line will be built from a starting point in Val‑des‑Bois on the transmission line that connects High Falls and Notre‑Dame‑du‑Laus substations.

Once the substation and supply line are commissioned in 2028, La Lièvre substation, whose equipment has reached the end of its service life, will be dismantled.

Overview of the process and next steps

In the previous steps of this project, Hydro‑Québec conducted inventories of the biophysical and human environments to better understand the host environment for the planned equipment.

Based on its inventories and technical, economic and environmental criteria, Hydro‑Québec proposed a site for the substation and two routes for the supply line.

In fall 2021, Hydro‑Québec also held information and consultation sessions with various stakeholders, during which a preferred line route was identified.

Then in 2023, Hydro‑Québec reevaluated the energy needs and best ways to optimize the entire transmission and distribution system in the Outaouais region. Following the analysis, the company resumed the draft‑design studies, taking new needs into account.

The proposed solution with the lowest impact was developed based on the discussions with host communities and the technical, economic and environmental studies.