A power outage in San Mateo County left nearly 40,000 Pacific Gas and Electric customers without electricity Thursday morning, the utility said.

A power outage in the San Mateo area left about 36,000 PG&E customers in the dark Thursday morning, according to the utility.

More than 35,500 Pacific Gas & Electric Co. customers around San Mateo were without power for unknown reasons Thursday morning, the utility said. The unplanned outage was first reported shortly before 9 a.

A widespread power outage affecting large parts of San Mateo, Foster City and Burlingame began Thursday morning, Jan. 16, around 8:30 a.m., with most residents seeing power resumed by 3