More on KentOnline
Dungeness B nuclear power station is still out of action after a fire.
It supplies half of Kent's energy needs at the National Grid will be finding other sources of power until it comes back on line.
Ten fire crews from across Kent tackled the blaze on Monday night and Tuesday morning.
Listen to Dungeness site director Graham Finn
The station's own fire team summoned help at about midnight after a fire broke out in unit 22 boiler annexe, which is related to the second reactor.
Martin Bultin, spokesman for British Energy, said: "Station personnel called the fire brigade who put it out quickly.
"We turned reactor 22 off. There was no release of radioactivity and no one was injured. We are looking into the cause."
He added: "The station fire team helped Kent Fire Service to put the fire out."
By 9am two fire crews remained on the scene, though the blaze was out.