Anjou Substation and 315-kV Transmission Line

To counter equipment obsolescence and meet the growing electricity demand on the island of Montréal, Hydro‑Québec is gradually replacing its 120‑kilovolt (kV) facilities with new, higher capacity 315‑kV equipment.

Currently, one 315-kV line supplies several substations in the north and east of the island of Montréal. The capacity of this line would be exceeded if it were to supply the other local substations due to be connected in the short and medium term.

For these reasons, Hydro‑Québec is building a new 315‑kV power line. Running for roughly 11 km from Bout‑de‑l’Île substation to the Bélanger substation tap line near Viau Boulevard, the new line will be built in an existing right‑of‑way. The two 120‑kV lines that currently run through this right‑of‑way will be dismantled. In addition, a 315-kV switching substation—Anjou substation—will be built near the Highway 25/Henri‑Bourassa Boulevard intersection. Minor work is also planned in existing substations.

As well as increasing capacity, the new equipment will improve the power grid’s flexibility and reliability.