The company took the action due to high winds that came from offshore and impacted the region beginning early Monday.
In Lake County, the 56 impacted customers had power restored by 6 p.m., said PG&E spokeswoman Deanna Contreras.
They were among 7,100 customers in 10 counties who PG&E said were included in this latest proactive shutoff.
At the same time, Contreras said power also had been restored to all impacted North Bay and North Coast customers.
As of Monday night, PG&E had not reported how much damage its crews had encountered during the patrolling phase, which occurs after the all clear is called by company meteorologists but before power is restored.
This is the second public safety power shutoff to impact Lake County this year.
In August, 4,500 customers were impacted in areas in and around Clearlake Oaks, Kelseyville, Cobb, Lower Lake, Riviera, Clearlake Highlands, Morgan Valley, Spring Valley and Hidden Valley Lake, as Lake County News has reported.
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