37 Erection, installation, maintenance and repair of windmills, wind power plants, wind turbines and other wind-operated machines; erection, installation, maintenance and repair of wind turbines, wind stations and other wind-powered machines; construction of wind power plants; consultancy relating to the installation, maintenance and repair of windmills and wind turbines; installation, maintenance and repair of anemometers; construction, erection, installation, repair, renovation, servicing, maintenance and dismantling of wind farms; installation, maintenance and repair of solar installations for generating power, solar collectors and photovoltaic modules; installation, maintenance and repair of solar energy systems; installation, maintenance and repair of solar collectors; installation, maintenance and repair of energy conversion apparatus, power plants, wave energy conversion apparatus and wave energy power plants; installation, maintenance and repair of batteries and accumulators; installation of residential solar panel power systems; installation, maintenance and repair of power plants and power grids; installation of hydropower systems; construction of power plants; installation, repair and maintenance of heating equipment; recharging of batteries and accumulators; installation of solar heating systems; installation and maintenance of computer hardware for the transfer of data for remote reading of electricity meters; installation, maintenance and repair of temperature control apparatus; installation, maintenance and repair of cooling and air-conditioning systems for temperature-controlled environments; construction of hydroelectric factories; installation, maintenance and repair of apparatus for heating, purifying air, refrigerating, drying, ventilating, temperature control and air-conditioning; installation, maintenance and repair of ventilating apparatus; installation, maintenance and repair of ventilating systems; installation, maintenance and repair of led lighting apparatus; installation, maintenance and repair of heating systems; repair of energy supply installations; installation, maintenance and repair of battery energy storage systems