A massive power outage left most of the Five Cities area without power last night. The unplanned outage was first reported at around 7:05. According to PG&E, more than 28,000 residents and businesses were without power. The outage affected Arroyo Grande, Grover Beach, Pismo Beach, Oceano, and some parts of Nipomo. Most customers had their power restored shortly after 8:30 p.m.. The cause of the outage is still unknown.