Even though Germany added 1808 MW of wind capacity during 2005, total generation from the national wind power fleet was only marginally more than during the previous year. Generation in 2005 was 26.5 TWh compared with 25.5 TWh in 2004 and 18.63 TWh in 2003, reports the German electricity federation, VDEW. In a statistically "normal" wind year, however, the 18,430 MW of wind plant at the end of 2005 should produce 33.8 TWh, or 6.7% of Germany's electricity needs, according to the Deutsches Windenergie-Institut. The low result in 2005 is largely explained by poor winds, reveals the Institut für Solare Energieversorgungstechnik (ISET). In six months of 2005 wind generation was below that in the same months of 2004 despite additions to the turbine fleet. Indeed, winds across Germany during 2005 were only 88% of the average annual wind energy content over the 12 years from 1993 to 2005, according to ISET. Furthermore, 850 MW of the wind power added in 2005 was installed in the last three months.