1.3 Billion Wind Turbines Needed to Replace Coal

In the United States in 2007 coal was responsible for generating 2,016,456 gigawatts of power. 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.