Promotion and realization of plants for the production of renewable energy, also in self-construction. Creation, operation and maintenance of photovoltaic and other energy production and distribution systems and construction activities; Rental of (roof) areas for the installation of photovoltaic and other systems; Participations; Acquisition, sale and encumbrance of properties; Offering of consulting and other services in the fields of renewable energies and energy efficiency; Organization and consulting for self-builders. The sole proprietorship is not profit-oriented.