The cost of using wind to generate electricity has been reduced a lot, even without other external costs, and the cost of using wind power in many suitable locations is lower than that of internal combustion engines with fuel oil. The annual growth rate of wind power generation was about 25% in 2002, and now it is growing at a rapid rate of 38%. In 2003, the growth of wind power in the United States exceeded the average growth rate of all generators. Since 2004, wind power has become the cheapest of all new energy sources. In 2005, the cost of wind energy has dropped to one fifth of that in the 1990s, and the downward trend will continue with the use of large wattage generators.<br>
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