Presentation at the 23nd European Photovoltaic Solar Energy Conference and Exhibition, 1. – 5. September 2008, Valencia, SpainABSTRACT: The scope of this paper is to give an overview of the system costs of 527 grid-connected PV systems from the data collected over a 18-month-period as part of the IEA PVPS Task 2 Economic Survey and operational performance of 461 grid-connected PV systems from the IEA PVPS Database. The datasets analysed are mainly from small residential grid-connected PV systems and also from some larger grid-connected PV systems from 11 countries for the cost data and from 17 countries for the operational data. They include freestanding, roof top and façade integrated systems. The PV plants investigated were built between 1991 and 2006. The monitored data from the 461 PV systems comprises datasets from 1 544 operational years. Analysis of the data available shows a trend towards lower system cost and a higher performance ratio (PR) over time. This paper is a summary of the IEA PVPS Task 2 Report T2-06-2007 [3]