37 Installation of electrical generating machinery; Installation repair and maintenance of power generating facilities; Installation, maintenance and repair services for electric generators, wind turbines, solar power arrays and power transmission infrastructure; Installation of wiring and power supply equipment for transmission and distribution of electricity; Maintenance and repair of power plants and energy transmission infrastructure; Maintenance, servicing and repair of power generating apparatus and installations; Construction planning services in the fields of electrical generating facilities and energy transmission infrastructure; Consulting services in the fields of construction of power generating plants, operation of power generating plants and power transmission infrastructure; Consulting services in the field of production of energy; Consulting services in the field of energy efficiency