Renewables accounted for 60.2 percent of the new U.S. electricity generation capacity for the first three quarters of 2015, according to the “Energy Infrastructure Update” from the Federal Energy Regulatory Commission (FERC) Office of Energy Projects.
The cumulative installed capacity of biomass, geothermal, hydropower, solar and wind from Jan. 1 through Sept. 30 was 7,276 megawatts. It included 2,966 megawatts of new wind capacity, 40.76 percent of the total, as well as 1,137 megawatts of solar, 205 megawatts of biomass, 45 megawatts of geothermal steam and 27 megawatts of hydropower. Natural gas generation capacity grew by 2,884 megawatts in the same period.
In the month of September, wind topped the new generation capacity list with 448 megawatts, natural gas was second at 346 megawatts and solar was third with 20 megawatts of new capacity.
FERC puts renewables at 17.4 percent of total installed U.S. generating capacity, including 8.59 percent hydro, 5.91 percent wind, 1.43 percent biomass, 1.13 percent solar and 0.34 percent geothermal steam generation. No new nuclear capacity was added in 2015 and only 9 megawatts of oil and 3 megawatts of coal-fired capacity.
Critics point out the renewable numbers – especially those for solar – are underestimated because FERC does not fully account for distributed generation in its reports.