A crash on Waterworks Road, between Lakeshore Road and Michigan Line, snapped a hydro pole and knocked out power to around 350 Bluewater Power customers.
It happened just before 5 p.m. Monday.
The Sarnia Police Service Traffic Branch was on scene and as part of the investigation, the roadway was closed to traffic.
Bluewater Power expected to have service fully restored by 10 p.m. Monday.
Police said there is no update on injuries or charges at this time as the investigation is in its preliminary stages.