A fire at a Pacific Gas & Electric Co. substation in San Francisco left tens of thousands of residents without power and halted some rail line services Friday morning.
The power outage occurred around 9 a.m. when a fire erupted at PG&E's Larkin Substation, affecting about 95,000 customers, according to Nicole Liebelt, a spokeswoman for the company.
Bay Area Rapid Transit, or BART, remained functioning with the exception of the Montgomery Station in downtown San Francisco, which has since been reopened, officials said.
Liebelt said power has since been restored to most residents, but there are fewer than 3,000 customers that are still without power.
She said a circuit breaker malfunctioned, sparking a fire in the insulation that resulted in the outage. No injuries have been reported.
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4:40 p.m.: This article was updated to reflect the number of customers without power and cause of the outage.