Over the last few years photovoltaics has become a mature product. In all countries around the world, photovoltaic consumer products and remote power systems have been sold in increasing numbers representing a total of 100 MW. Generally speaking, photovoltaics is currently the cheapest power source up to an installed capacity of a few kW. Many rural needs for lighting, telecommunication, water and health care are in that power range. Therefore, applications and use of photovoltaic systems have a particular appeal for developing countries. But also in industrialised countries, photovoltaics is a key option for decentralised power generation.