The U.S. is now the world's top Wind Power Producer and closing in fast on Solar. The U.S. increased its wind capacity by 50 percent last year to a total of 25 GW, enough to power nearly 5 million homes. Germany took a close second with 24 GW of installed wind, while Spain took the third spot. Globally wind power grew by 29 percent, to reach 121 GW total capacity. As one of the most affordable sources of alternative energy -- being only slightly more expensive than coal and nuclear -- wind accounted for 42 percent of the new energy installations in the U.S.