D ELECTRICITY, GAS, STEAM AND AIR-CONDITIONING SUPPLY
This section includes the activity of providing electric power, natural gas, steam, hot water and the like through a permanent infrastructure (network) of lines, mains and pipes. The dimension of the network is not strictly defined. Also included are the distribution of electricity, gas, steam, hot water and the like in industrial parks or residential buildings.
This section therefore includes the operation of electric and gas utilities, which generate, control and distribute electric power or gas.
Also included is the provision of steam and air-conditioning supply.