Update, 7:30 p.m.:
Power has been restored to all customers, according to PG&E.
Almost 3,000 people are without power in the Templeton and Atascadero area.
As of 4:24 p.m., 2,990 PG&E customers are affected by the large-scale electrical outage.
According to PG&E, the cause of the outage is still unknown. The issue was first reported at 3:53 p.m., and is expected to be resolved by 7:15 p.m.