4
Electrical energy from wind power and solar power, electrical energy from non-renewable sources
7
Machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; machines, engines and motors used in power stations, parts and fittings for power stations in the form of generators, compressors, pumps, regulators (machine parts), turbines, current generators and superheaters as well as superchargers
37
Building construction; drilling for oil, gas, coal or other natural resources for the production of power and energy products; mining extraction and drilling of wells; repair of installations for energy production; repair and maintenance of energy generating installations; repair and maintenance of power generating apparatus and installations; repair or maintenance of nuclear power plants, wind power plants and hydroelectric power stations; construction of wind power plants and hydroelectric power stations
39
Warehousing, storage and distribution of electricity, power, air, heat and cold, gas and oil as well as fuels; distribution and storage of energy products; storage of energy and fuels; electricity distribution; information and advisory services in relation to the distribution of energy
40
Processing and refining of oil, gas, natural energy sources and fuels for the production of energy and electricity, cold, heat and air; production of energy; leasing of energy generating equipment; consultancy services relating to the generation of electrical power; production of energy by nuclear power plants