PASO ROBLES, Calif - UPDATE: 6:18 p.m.
The outage map from PG&E shows the number of people affected reduced to less than 100.
PG&E customers in northern San Luis Obispo county were plunged into the dark Thursday evening. The PG&E outage map shows significant parts of Paso Robles are without power. The outage map continues northwest of the city toward parts of Lake Nacimiento.
The cause of the outage is unknown, and the PG&E outage map lists a restoration of power by 9:00 p.m.
This is a developing story and will be updated.