The power is back on in the municipalities of Neebing and Oliver Paipoonge near Thunder Bay, after more than 800 homes were without electricity for more than 12 hours on Sunday, according to the Hydro One website.
Power went out just after 1 a.m. ET Sunday and affected communities in Oliver Paipoonge as well as Scoble, Pardee, Crooks, Pearson and Blake in Neebing.
The power was restored by late Sunday afternoon.
According to workers on the scene, the power outage was caused by a motor vehicle accident and not an overnight storm that passed through the area, a Hydro One spokesperson said.
Neither the Thunder Bay Police Service nor the Ontario Provincial Police had any information about an accident when CBC News inquired on Sunday.
A map on the Hydro One website also showed three small power outages affecting fewer than 20 people each, around the Nipigon and Rossport areas on Sunday afternoon.
As of 5:30 p.m., those outages no longer appeared on the map, indicating power had been restored in those areas.