Wind power is developing rapidly. Since 2000, the annual growth rate of wind power installed capacity in the world is 20% - 30%. According to the latest global wind power growth data released by the Global Wind Energy Association, in 2008, the world's newly added wind power installed capacity reached 27.5 million kilowatts, bringing the global wind power installed capacity to 120 million kilowatts, a year-on-year increase of 29% over 2007. From 1998 to 2008, the installed capacity of wind power in the world is increasing, as shown in Figure 1-1.