UPDATE 2:27 p.m. Friday: The power outage that affected 580 PG&E customers in southern San Luis Obispo on Thursday night was caused by a broken connector, a company spokesman said.

Blair Jones of PG&E said the broken connector caused a power line to fall to the ground in the 3600 block of South Higuera Street. The break occurred at 7:29 p.m.

About an hour later all but 140 customers had electricity restored, Jones said. Full service was restored by 1:30 a.m. following repair of the line.

UPDATE 8:16 p.m.: PG&E crews believe the power outage stemmed from a location near Sears in the Madonna Plaza Shopping Center, company spokesman John Lindsey said.

Crews should be testing lines to ascertain from where the outage stems over the next 20 minutes. This process will restore electricity to some who have lost power until the break has been repaired.

Original story: About 580 PG&E customers in the San Luis Obispo area lost power for an unknown reason about 7:30 p.m. Thursday, according to PG&E spokesman John Lindsey.

Power crews have been dispatched to fix the problem. The cause is unknown.

The Tribune is one of the customers affected by the outage.

Check back for updates.