Almost 4,200 PG&E customers in the Walnut Creek area were without power Sunday night, according to the company's outage map.
PG&E officials told NBC Bay Area that at around 8 p.m., a vehicle hit a PG&E power pole, causing about 4,192 customers to lose power.
PG&E officials said their crews worked with first responders to make the area safe.
As of 9:50 p.m., PG&E crews have restored power to about 4,156 customers, officials said.
According to PG&E, their crews will continue to work safely and as quickly as possible to restore power to the remaining 36 customers.