37 Installation services of equipment, installations, apparatus and instruments in the energy sector, namely, of renewable energy generation equipment, apparatus and instruments for conducting, switching, converting, storing, regulating and controlling of electricity, and apparatus and instruments for measuring and analyzing of electricity; maintenance work of equipment, installations, apparatus and instruments in the energy sector, namely, of renewable energy generation equipment including apparatus and instruments for conducting, switching, converting, storing, regulating and controlling of electricity and apparatus and instruments for measuring and analyzing of electricity; repair work of equipment, installations, apparatus and instruments in the energy sector, namely, of renewable energy generation equipment including apparatus and instruments for conducting, switching, converting, storing, regulating and controlling of electricity and apparatus and instruments for measuring and analyzing of electricity; assembly work of equipment, installations, apparatus and instruments in the energy sector, namely, of renewable energy generation equipment including apparatus and instruments for conducting, switching, converting, storing, regulating and controlling of electricity and apparatus and instruments for measuring and analyzing of electricity; cleaning services in the energy sector, namely, cleaning of renewable energy generation equipment including apparatus and instruments for conducting, switching, converting, storing, regulating and controlling of electricity and apparatus and instruments for measuring and analyzing of electricity; laying of cable; installation, maintenance and repair of energy-saving devices, installations, apparatus and instruments for energy production, energy needs and energy consumption in the energy sector; installation, maintenance and repair of power generation equipment, installations, apparatus and instruments; construction project management in the energy sector