Officials say the outage began at 4:52 p.m. The estimated time for full restoration is midnight. More than 5,000 customers were impacted, but that number has dwindled to just over 4,000 by 6 p.m.
PG&E's outage map indicates the utility is investigating the source of the outage.
The outage map shows the majority of those impacted live in the Arroyo Viejo, Webster, Cox and Iveywood neighborhoods.
We will update this story as we learn the latest information.