The power went out east of Highway 99 along Herndon Avenue just after 2:30 am.
The outage covers as far north as Avenue 7 to south along Riverside Drive at the El Paseo Shopping Center, and as far east as the Riverside Golf Course.
More than 700 customers are without power. PG&E has not said when they expect power to be restored.
There is no word on what caused the outage at this time.