How efficient is wind power generation? Let’s look at just one example in the U.S.
1.3 Billion Wind Turbines Needed to Replace Coal
Tennessee wind turbines similar to McFadden Ridge
Construction of Rocky Mountain Power’s McFadden Ridge I wind project is underway in Albany County, Wyoming, near the towns of McFadden and Rock River. The project consists of 19 General Electric wind turbines, capable of generating a combined 28.5 megawatts of electricity.
Now for a little back-of-the-envelope math. The McFadden Ridge project has 19 wind turbines producing 28.5 megawatts of electricity. Each wind generator therefore produces 1.5 megawatts. In the United States in 2007 coal was responsible for generating 2,016,456 gigawatts of power (see USA Electricity Generation 2007 Chart). As 1 gigawatt equals 1,000 megawatts you would need 1.3 billion (2,016,456,000 megawatts / 1.5) wind turbines to replace coal. And coal only accounts for 48% of electricity production.