6. Wind power
• Wind is the cheapest alternative energy source. Electricity from wind energy costs between 4.5 cents and 7.5 cents per kilowatt-hour, making it cost-competitive with fossil fuels.
• The windiest 20 states have enough wind energy to potentially provide one-third to one-half of the total U.S. energy use, and all of its electricity, now and in the next 40 years.
• Today’s wind turbine is as tall as a 22-story building and generates enough electricity ...