One of two reactors at the Diablo Canyon Nuclear Power Plant remained shut down Monday after a transformer fire was extinguished.
There was no danger of a radiation leak, and the reactor was shut down as part of standard safety procedures at the Central Coast facility, spokeswoman Sharon Gavin said.
She did not know when the reactor would restart.
The fire broke out Sunday at a non-nuclear part of the plant, and the power plant's own firefighting crew extinguished the blaze in about 14 minutes.
The San Luis Obispo County plant started supplying electricity in 1985 and generates power for about 3 million homes in northern and central California.
The cause of the fire was being investigated.
(Source: Energy Central)