(1) - Hydrogen; gas in solid form and dissolved form for industrial use.
(2) - Electrical energy.
(3) - Hydrogen gas installations for the generation of electricity [gas power plants].
(4) - Construction of hydrogen power plants; construction of carbon capture and storage plants; installation, maintenance and repair activities relating to hydropower, wind power, gas power plants, installation of electrical appliances for producing electricity from hydrogen, installation and repair of heaters and central heating appliances; operation of service stations; power plant construction; maintenance services of hydrogen gas vehicles; construction of incineration plants; operation and maintenance services of power plants; construction of gas power plants; construction of buildings and factories; building services in connection with dam, reservoir and hydraulic power stations; general building contractor services; installation, repair and machining and maintenance of thermal, hydroelectric and nuclear installations
(5) - Construction; installation, maintenance and repair activities relating to hydropower, wind power, gas power plants; installation of electrical appliances; installation and repair of heaters and central heating appliances; operation of service stations; power plant construction; maintenance services; construction of incineration plants; operation and maintenance services of power plants; construction; construction activities relating to industrial complexes; building services in connection with dam, reservoir and hydraulic power stations; building services; installation, repair and machining and maintenance of thermal, hydroelectric and nuclear installations.
(6) - Processing of hydrogen, dry gas, natural gas and natural gas condensates; processing of petrochemical products; production of electric power and electricity from renewable resources; district heating production; waste incineration; production of electricity from renewable resources; production of heated water and energy; energy production services; gas purification; air purification; water treatment; destruction of rubbish and waste; incineration of waste and rubbish; hydrogen gas production; generation of gas and electricity; gas processing; refining of gas; generation of electricity from hydrogen
(7) - Processing of materials and substances, as well as processing of dry gas, natural gas and natural gas condensates; processing of petrochemical products; production of electric power and electricity; district heating production; waste incineration; production of electricity, heat and energy; energy production services; gas purification; air purification; water treatment; destruction of rubbish and waste; incineration of waste and rubbish; hydrogen gas production; generation of gas and electricity; gas processing; refining of gas.
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