A major power outage swept across western Montreal Wednesday afternoon.

At its peak, about 64,000 customers in NDG, Hampstead, Cote-St-Luc and Montreal West were affected. 

The outage stemmed from faulty batteries at the Hampstead post that needed to be replaced in an emergency measure.

Work began at 2 p.m., when electricity was cut to the clients.

Power was almost entirely restored by 7 p.m.