ABSTRACT
The original ewz- model of the 'Solarstrom Stock Exchange' for the promotion of solar electricity has evolved to become a very successful project and the numerous positive feedback's and inquiries ewz has received from home and abroad are most encouraging. Beginning of 2000, 1620 kW nominal PV power had been installed. 42 PV plants are under contract producing yearly a total solar electricity value of 1'200'000 kWh. 5700 ewz customers ordered solar power at a current price of 0.65 U$ / kWh. Negotiations with further suppliers indicate prices for solar electricity below the 0.50 U$ / kWh mark (this includes the federal contribution of approx. 1/3 of the installation costs). Cost reduction of around 20% for installed PV plants could be achieved due to the ewz 'Solarstrom Stock Exchange'- model, but in parallel the quality and the aesthetics of the installation was notable increased. A first rough analyses shows that 60% of the installation are in the range 0 to +10% difference for the produced energy compared to the prognosticated figure. Some installations perform in the range of-12.5%, the main reason for this bad performance were malfunction of inverters and a three-phase safety disconnector, which is only manually recloseable.
