Installation and maintenance of photovoltaic installations; Installation and maintenance of solar energy based power plants; Installation and maintenance of solar thermal installations; Installation and maintenance of photovoltaic/solar thermal hybrid installations; Installation of photovoltaic cells and modules; Installation of solar energy systems and alternative energy products for residential and commercial use; Installation of solar heating systems; Installation, maintenance and repair of photovoltaic cells and modules; Installation, maintenance and repair of photovoltaic modules; Installation, maintenance and repair of solar collectors; Installation, maintenance and repair of solar energy systems; Installation, maintenance and repair of solar installations for generating power; Installation, maintenance and repair of solar installations for generating power, solar collectors and photovoltaic modules; Removal and reinstallation of solar panels; Repair and installation services, namely, the installation of heating, cooling and environmental control systems primarily using solar energy, renewable energy resources and rainwater