230/25‑kV Bonsecours Substation and 230‑kV Supply Line

The project area is currently supplied by a 49‑kilovolt (kV) system that was built by the Southern Canada Power Company in the 1940s. Due to growth in the region’s electricity demand, this system has reached its maximum capacity.

Economic development, teleworking and transportation electrification also contribute to an increased demand for electricity. To meet the region’s current and long-term needs, Hydro‑Québec must upgrade the power grid in Estrie. This project is part of the plan to convert Estrie’s 49‑kv system, which began with the 2016 commissioning of the new 120/25‑kv Adamsville substation in Bromont.

Recommended solution

Hydro‑Québec would like to build a 230/25‑kV substation in Bonsecours. The new substation will connect to the system via a 230‑kV line, which will first be operated at 120 kV. Extending for some 20 km, the future line will connect the new substation to Stukely substation in Stukely-Sud.

The project will also require related work inside the current boundaries of Stukely substation, as well as additions and modifications to the distribution system to serve customers in the region.

Commissioning of the substation is slated for fall 2026.

The 49‑kv Lawrenceville and Valcourt substations, as well as sections of the existing 49‑kv lines will then be

Schedule

• Presentation of selected project Spring 2022
• Continued collaboration with the community and integration of mitigation measures Summer–fall 2022
• Permitting 2023-2024
• Construction 2025-2026
• Commissioning Fall 2026