The crash at Nordahl and Knob Hill roads occurred around 1:50 a.m., according to San Diego County sheriff’s Sgt. Paul Michalke.
More than 600 homes and businesses in east San Marcos and nearby Escondido lost power, though electricity was restored to most by 3:30 a.m., SDG&E reported on its website.
As of 6 a.m., 24 customers in east San Marcos were still affected. The outage was expected to be fully resolved by 10 a.m.
Nordahl Road between Knob Hill and Rock Springs roads will remain closed until the pole is repaired later today, Michalke said.