9:59 PM: Power has been restored to the thousands of Pacific Gas and Electric Co. customers affected by a late afternoon outage in the city’s Richmond District and Laurel Heights neighborhood.

The outage, reported at 4:15 p.m., initially affected 8,300 customers and power was incrementally restored throughout the evening. PG&E spokesman Andrew Souvall said all customers had regained power by about 8:45 p.m.

He said crews were performing routine maintenance in the area of Sixth Avenue and Clement Street when an operating switch produced a large spark, triggering the outage. There was no explosion and no injuries, Souvall said.

6:13 PM: Approximately 4,300 Pacific Gas and Electric Co. customers are without power in San Francisco this evening, PG&E spokesman David Eisenhauer said.

The outage, reported at 4:15 p.m., initially affected 8,300 customers in the city’s Richmond District and Laurel Heights neighborhood, Eisenhauer said.

PG&E has since restored power to 4,000 of those customers, he said.

Eisenhauer said it is not clear what caused the outage.

“Once we’re able to determine the cause we’ll know what it’s going to take to do the repairs,” he said.

In the meantime, he said, PG&E is restoring power incrementally by rerouting power from other circuits.

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