Thousands lost power Tuesday night in Newcastle after a car crashed into a power pole on Ophir Road.
PG&E said about 6,800 customers initially were affected because the pole held up a transition line.
Workers at nearby Omega Diamond told FOX40 they heard the explosion about 3 p.m. Tuesday.
"I looked out of my office window and saw the power line swaying back and forth," said Sam Devai, CEO of Omega Diamond.
"I ran out and I looked down that way and there was a big loud boom and flames kind of shot out of (the downed pole)... I was just kind of hoping the guy that was in the car was okay," Brandon Lampman told FOX40.
The driver was able to crawl away according to Lampman, although 60,000 volts flared above his head.
"Poor kid inside was scared half to death," Devai said.
Soon emergency crews responded, but it's unclear what caused the crash.
"Well two stories, he said he saw something on the road and swerved, and another was allegedly he fell asleep," Devai told FOX40.
PG&E crews were quick to shut off the power, but had to cut off about four thousand customers for most of the night.
The company expects to have the line replaced by sunrise.