Better technology and government stimulus, along with high prices for competing types of power generation, are driving renewed optimism about wind power. With prices for the fossil fuels used in conventional power plants hovering near record levels, wind power is the cheapest source of energy that can be built now. Newly built wind farms are "beating the socks off of any other new source of generation," says Ryan Wiser, an energy economist at the Department of Energy's Lawrence Berkeley National Laboratory in California.
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A modern wind turbine can produce electricity for about 2.5 cents to four cents a kilowatt hour, including government subsidies, so the biggest turbines compete effectively against modern natural-gas-fired power plants, though they won't run as many hours of the day due to the variability of wind. Assuming natural gas at $6 per million British thermal units, a kilowatt hour of electricity from a newly built gas-fired plant costs at least 5.5 cents a kilowatt hour, including both fuel and capital costs. Natural-gas plants have led the sector in recent years because they can be constructed quickly, are clean burning and operate reliably.
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In Washington, Puget Energy Inc.'s Puget Sound Energy in September said it intends to buy the entire output of a new wind farm that Zilkha Renewable Energy of Houston hopes to build on rangeland near Ellensburg in eastern Washington. The Wild Horse project is expected to include more than 100 turbines producing 165 megawatts of power, enough to power 40,000 homes. If built, it would be Kittitas County's biggest taxpayer, contributing more revenue than the next 10 biggest taxpayers combined.
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