Dec. 21 (UPI) -- Power has been largely restored after a widespread and unexplained blackout left swaths of San Francisco without electricity on Saturday, just days before Christmas.

Pacific Gas and Electric said in a statement Saturday afternoon that the blackout was affecting about 130,000 businesses and homes. At the time, the company said it had "stabilized the grid" and did not expect the blackout to further spread.

Late Saturday night, the company said crews restored about 95,000 customers. Of the 35,000 customers still without power Saturday night, another 10,000 have since had their service restored.

"We apologize for the delay in getting your power back on," Pacific Gas and Electric said in a notice on its outage map around 3:45 p.m. local time Saturday. "Unforeseen issues can cause unexpected delays for our crews."

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