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According to the latest "Energy Infrastructure Update" report from the Federal Energy Regulatory Commission's Office of Energy Projects, 1,231 MW of new in-service electrical generating capacity came on line in the United States in January 2013 -- all from wind, solar, and biomass sources.

This represents a nearly three-fold increase in new renewable energy generating capacity compared to the same month in 2012 when wind, solar, and biomass provided 431 MW of new capacity.

In January 2013, wind accounted for the largest share of the new capacity with six new "units" providing 958 MW followed by 16 units of solar (267 MW), and 6 units of biomass (6 MW). No new generating capacity was reported for any fossil fuel (i.e., natural gas, coal, oil) or nuclear power sources.

Renewable sources now account for 15.66% of total installed U.S. operating generating capacity:  water - 8.50%, wind - 5.17%, biomass - 1.29%, solar - 0.38%, and geothermal - 0.32%.  

*By comparison, oil accounts for 3.54% of total operating generating capacity, nuclear for 9.23%, coal for 29.04%, and natural gas for 42.37%.