The outage affected about 4,000 people, police said.
Roger Christiansen of Fairfax was driving east in the 900 block of Sir Francis Drake Boulevard at about 5:45 a.m. Sunday when the trailer he was towing released from the rear of the vehicle, police said.
It rolled off the road and hit a power pole, according to San Anselmo police.
Several power lines were severed, disrupting service for residents of San Anselmo, Fairfax and San Rafael.
The outage lasted about two hours.
The accident is under investigation.
- IJ report