When there is high demand on California’s electric grid, PG&E may be ordered to do Rotating Power Outages through different PG&E service block numbers. Estimated restoration times are 2-3 hours after the outage actually starts. The situation remains dynamic and shutoff and restoration times may change.
 
FIND YOUR PG&E BLOCK NUMBER
If there is enough advance notice, you can learn if you will be affected by a Rotating Power Outage by finding your block number at https://pgealerts.alerts.pge.com/outagecenter/addresslookup/?_gl=1*623ofj*_ga*MjAwMDU1NTUwMi4xNjk4OTQ5MTI5*_ga_FQYX57XZEJ*MTY5OTg5NjMwNy42LjEuMTY5OTkwMDE4Mi42MC4wLjA. or on your PG&E bill in the section that says “Service Information.”
 
The need for outages is determined by the statewide grid operator, the California Independent System Operator or CAISO, not PG&E. Rotating outages are not related to any issues with PG&E's equipment or its ability to deliver energy locally.
 
Rotating Power Outages are due to strain on California's grid and are different from Public Safety Power Shutoff (PSPS) events, which are called during specific high fire-threat conditions.

https://www.pge.com/en/outages-and-safety/outage-preparedness-and-support/understanding-electric-outages/rotating-outages.html