1
hydrogen; carbon dioxide
4
Fuels; gas; Natural gas; Biomass fuel
35
Assistance and consultancy services in the field of business management of companies in the energy sector
37
Servicing of power generating apparatus and installations; Repair of gas supply systems; Advisory services relating to the repair of plumbing; Repair of energy supply installations; Maintenance and repair of industrial piping; Maintenance and repair of energy generating installations; Maintenance and repair of oil and gas storage installations; Maintenance and repair of gas and electricity installations; Installation of gas supply and distribution apparatus; Extraction of natural resources; Installation of pipe systems for conducting of gases; Installation of gas pipelines; Repair of natural gas, biogas and hydrogen plants and machines; Repair of energy production plants and machines; Construction of structures for the production of natural gas and hydrogen; Construction of structures for the storage of natural gas and hydrogen; Construction of structures for the transportation of natural gas and hydrogen
39
Transport of gas, hydrogen and carbon dioxide; Distribution of gas; Transport of energy; Transport and distribution of natural gas, hydrogen and liquefied gas; Pipeline transport of gases; Information and advisory services in relation to the distribution of energy; Arrangement of the storage of fuels; Arrangement of storage of energy; Storage of gaseous fuels; Gas storage services
40
Generation of gas and electricity; Gas refining services
42
Scientific and technological services in relation to the energy sector; Industrial analysis and research services in relation to the energy sector; Software design and development for use in the energy sector; Testing, authentication and quality control in relation to energy production and distribution facilities; Design and development of energy distribution networks; Provision of information concerning research and technical project studies relating to the use of natural energy; Engineering services relating to energy supply systems