UPDATE (11:41a): Most of the power has been restored, 21 customers still effected along with the traffic light at California & Real Rd.
Crews are on scene.
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UPDATE (11:29a): PG&E says 821 customers are effected. The cause is unknown at this time. PG&E crews are en route.

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Employees were turning customers away at Barnes & Noble on E. California Ave Sunday morning after an apparent power outage. 

The surrounding area seemed to be effected as well.

Marie Callender's, Mimi's Cafe and El Polo Loco on E. California were also without power around 11:15 a.m.

The traffic signal at California & Highway 99 was also out. 

According to the PG&E Outage Map 821 customers are effected and crews are on the way to the scene to assess the cause and correct the problem.