To provide, on a non-profit basis, partial decentralized power supply based on solar energy for the operation of devices that depend on electrical energy. Construction and operation of solar energy systems, e.g., photovoltaic systems for feeding into the public electricity grid, solar power plants for grid-connected power supply, solar water heating systems, and similar systems with the main energy source being the sun. Education, consultation, exchange of knowledge, and proper information on all energy-saving possibilities as well as on the use of solar energy in cooperation with all interested parties and authorities.