Crews from Ely and Chatteris were called to a road traffic incident in Block Fen Drove, Chatteris.
A fire had broken out involving and HGV that had been involved in a collision with power lines.
A male casualty was out of the vehicle on the arrival of the fire service and was taken to hospital by air ambulance suffering burns.
Firefighters pumped water from an open water nearby to put of the fire and returned to their stations by 7.50pm.
The cause of the fire was accidental.