A fire broke out at the Kleen Energy power plant in Middletown on Tuesday night.
According to fire officials, fuel oil spilled at the plant earlier in the day and some of that oil got into some insulation behind a turbine. The turbine heated up and the oil caught fire.
The fire was minor, but difficult to put out because of the insulation, fire officials said.
There was no damage to the plant.
Kleen Energy was the site of a 2010 explosion that killed six workers.