D - Electricity, Gas, Steam, and Air Conditioning Supply CAEN Code 3512: Transmission of electricity This class includes: The operation of transmission systems that convey electricity from the generation facility to the distribution system. Previous - D - ELECTRICITY GAS STEAM AND AIR CONDITIONING SUPPLY CAEN Code 3511: Production of electricity Next - D - ELECTRICITY GAS STEAM AND AIR CONDITIONING SUPPLY CAEN Code 3513: Distribution of electricity