Das Projekt "Auswirkungen von dezentraler Photovoltaik auf das lokale Versorgungsnetz" wird vom Umweltbundesamt gefördert und von Staatliches Institut für Gesundheit und Umwelt durchgeführt. In the CEC funded Joule-II-project 'Consequences of Decentralised PV on Local Network Management' a regional network for measuring global solar energy was installed and maintained in the region of Saarbruecken, Germany from 9305 to 9509. The 15 stations were distributed in a near and in a far distances grid over an area of 31 times 45 km2. They were equipped with CM-11 pyranometers and identical PC-based measurement facilities to guarantee similar hard- and software conditions. Over the measuring period, we had a mean monthly availability of 98 per cent.