4
Electrical energy; Electrical energy from renewable sources
7
Turbines for power generation; Steam turbines [other than for land vehicles]; Electric power generators using waste heat; Turbine blades for power generation
9
Apparatus and instruments for conducting electricity; Apparatus and instruments for accumulating electricity; Apparatus and instruments for transforming electricity
11
Steam accumulators; Steam boilers, other than parts of machines; Coils [parts of distilling, heating or cooling installations]; Sanitary apparatus and installations; Evaporators; Heat accumulators; Heat regenerators; Regulating accessories for water or gas apparatus and pipes; Heat exchangers, other than parts of machines
37
Repair of turbines; Installation of electrical and generating machinery; Repair or maintenance of power generators; Servicing of power generating apparatus and installations; Repair of power generating apparatus and installations; Maintenance of power generating apparatus and installations; Maintenance, servicing and repair of power generating apparatus and installations
40
Electricity generating; Production of electrical power from renewable sources; Generation of power; Energy production; Consultancy services relating to the generation of electrical power
42
Research in the field of energy; Conducting research and technical project studies relating to the use of natural energy; Provision of information concerning research and technical project studies relating to the use of natural energy; Design and development of regenerative energy generation systems; Consultancy relating to technological services in the field of power and energy supply; Engineering services relating to energy supply systems; Technological consultancy in the fields of energy production and use; Technological consulting services in the field of alternative energy generation