A large swath of Perth County and a smaller part of Wellington County were in the dark Monday afternoon.
Hydro One says a power outage affected 3,391 properties centred around Listowel.
According to Hydro One, the outage also encompassed Milverton, Palmerston, part of the Conestogo Lake area and everything in-between, with its western boundary stopping just short of Monkton.
Fire officials say an equipment failure was to blame.
Power was restored around 7:30 p.m.
