Get used to this fact. It is going to be repeated time and again for the next 20 years in the USA.
Renewable energy and gas provided 100% of all new capacity in the USA during the first quarter of 2013
http://www.ferc.gov/legal/staff-reports/2013/mar-energy-infrastructure.pdf. No new coal, nuclear, or oil capacity came on line.
A total of 1,886 megawatts came on line in the first 3 months of 2013, and 82% were renewable energy or 1,546 megawatts. The remainder of 340 megawatts came from natural gas plants.
Making up the renewable totals were 958 megawatts of wind and 537 megawatts of solar. Wind again leads the nation in new capacity and does so even when it is in a bit of a lull. As for the solar number, it includes only utility scale solar farms that are feeding power into the grid.
Then consider this stunning fact: 100% of all the new capacity opening in March were solar plants. Wow!