Even with the surge in new projects, energy from such renewable sources as wind,
solar and water accounted for only about a tenth of total U.S.
power generation last year.
Still, the U.S. leads the world in wind energy with about 48,800 utility-scale turbines operating across the country, generating enough electricity to power about 20 million homes. By 2030, the Energy Department estimates wind will provide a fifth of the nation’s electricity.