FERC puts renewables at 17.4% of total installed U.S. generating capacity, including 8.59% hydro, 5.91% wind (68,830 MW), 1.43% biomass, 1.13% solar (13,180 MW), and 0.34% geothermal steam. No new nuclear capacity was added in 2015, and only 9 MW of oil and 3 MW of coal.

Because of differing capacity factors, the U.S. Energy Information Administration (EIA) distinguishes between installed generation capacity and actual generation. Its July 2015 report put renewables’ share of net generation at 13.6%.

Renewables advocates say FERC and EIA do not fully account for distributed energy resources (DERs) in their measurements, meaning that actual renewable energy penetration is higher than the figures suggest.

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