US wind capacity
Report says US installed wind capacity exceeds 20,000 megawatts, enough electricity to serve 5.3 million American homes and making the US the world leader in wind power capacity.
The World Watch Institute, 2009 State of the World: Into a Warming World (Print Publication). A Worldwatch Institute Report on Progress Toward a Sustainable Society. ed. Linda Starke. Published by W.W. Norton & Company in New York, NY. page xxv.