GADSDEN, Ala. (AP) - A faulty heating element on the city of Gadsden's biodiesel equipment likely caused the top of a tank to blow off.
But Superintendent Greg Noah said the only damage was a hole in the building's roof.
Noah said the equipment is going back to the manufacturer for repair and he expects to be back producing biodiesel fuel in a few days.
The equipment, which is located in the city's Fleet Management facility, converts used cooking oil into biodiesel fuel by mixing it with lye and methanol.
No one was injured in the explosion Wednesday and the top of the tank where the oil is poured is designed to come off if there is too much pressure.
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