KCBS_740 LOS ANGELES (AP) — Southern California Edison is investigating the cause of a widespread power outage that forced the shutdown of a Los Angeles County refinery and raised concerns that gasoline prices in the region may temporarily go up.

The utility says more than 57,000 customers lost power Monday in Gardena, Hawthorne, Inglewood and parts of Los Angeles and Torrance.

READ MORE: UPDATE: Wind-Whipped Big Sur Wildfire Grows To 1,500 Acres, Blaze Erupts Near Geysers Peak In Sonoma

The Los Angeles Times says the outage was enough to cut production temporarily at the Torrance refinery, which PBF Energy bought from Exxon Mobil in July. PBF says it could take days to return the plant to full service.

READ MORE: High Winds Topple Trees; Leave Path Of Destruction In San Jose Neighborhood

An explosion at the refinery last year caused it to operate at less than 20 percent capacity for months, sending gasoline prices in Southern California to as much as $1.50 above the rest of the nation.

MORE NEWS: Pipeline Of Illegal Weapons Shutdown; Four Arrested In San Mateo, Alameda County Raids

© Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.