In the just-released monthly “Energy Infrastructure Update” from FERC’s Office of Energy Projects, nine new units of wind provided 707 MW, followed by 44 units of solar at 522 MW; nine units of biomass at 33 MW and one unit of hydropower at 29 MW. By comparison, two new units of natural gas came online, providing 18 MW of electricity generating capacity. In 1Q 2015, the U.S. installed 10 units of natural gas-fired capacity at 458 MW. There was no new capacity reported for the quarter from coal, nuclear, oil or geothermal steam.
In addition, 75 MW of solar, 72 MW of wind, and 33 MW of biomass accounted for all of the new generating capacity reported by FERC for just the month of March. Solar and wind were the only sources of new capacity in January as well. Renewable energy sources now count for just over 18 percent of total available installed generating capacity in the U.S. When FERC issued its first Energy Infrastructure Update in December 2010, renewable sources accounted for over 13 percent.