"The United States led the world in new installations for the third year in a row with 5,244 megawatts of wind capacity added, increasing total installed capacity by 45 percent. Driven by the federal production tax credit and by state renewable energy mandates, wind power represented 30 percent of all U.S. capacity additions in 2007. The nation's wind capacity now totals 16,818 megawatts, second only to Germany's. "
Janet L. Sawin. "Wind Power Continues Rapid Rise," World Watch. July/August 2008, 34.