About 8,500 homes and businesses in neighborhoods north and west of Mount Royal lost power late Tuesday morning.
The affected areas include sections of Cote-des-Neiges, Outremont and Montreal's Mile End neighborhood.
Hydro-Quebec says its crews have been dispatched, and they expect power to be restored by about 1 p.m.
Meanwhile, about 175 Hydro customers are without power a section of Kirkland, near Heritage Park. Power is expected to be restored there by 4 p.m.