We are a wind power generator manufacturer in China. Typically, wind power generators are used to make electricity, wind mills are used for mechanical power, and wind pumps are built to pump water. At the end of 2009, worldwide nameplate capacity of wind-powered generators was 159.2 gigawatts (GW). Energy production was 340 TWh, about 2% of worldwide electricity usage. This is still rapidly growing. In recent years, some countries have achieved high levels of wind power penetration, such as 19% of stationary electricity production in Denmark, 13% in Spain and Portugal, and 7% in Germany in 2008. Many isolated locations use wind power generators to provide electricity. As wind energy is renewable, clean, and produces no greenhouse gas emissions during operation, it is becoming an attractive alternative to fossil fuels. Wind power is non-dispatchable, so all of the available output must be taken when it is available.