Caney Creek Fire Department responded to reports of a fire at 10625 Jefferson Chemical Road around 1 p.m.
Investigators say two electricians were seriously burned when a high voltage electrical panel they were working on exploded.
The fire was quickly put out by firefighters. Firefighters say lots of dust from the plant blew around, but no chemicals were released.
Both electricians were transported to the hospital for burn treatments.
Authorities did not order an evacuation for the surrounding area, but the facility was evacuated as a precautionary measure.