(CNN) Some California communities went without power this weekend as PG&E took precautions in areas at high fire risk.

The shutoff started Saturday morning, PG&E said, and some restoration began that afternoon.

Initially, the outage was anticipated to affect about 1,600 customers in Napa, Solano and Yolo counties, the utility company said.

But Saturday night, PG&E announced that it would proactively shut power off to Butte and Yuba counties. Approximately 16,000 customers have been affected.

The California Public Utilities Commission last week gave utilities new rules about intentionally cutting power to prevent wildfires. That followed the state's deadliest and most destructive wildfire, the Camp Fire

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