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Production of biofuel co-products: ~90 % of corn-ethanol biorefineries are currently natural gas powered dry mills producing distillers grains for livestock feed Source: Renewable Fuels Association, Jan. 2009 Total installed capacity (2009): 12.5 billion gallons per year 86 % installed since 2001 90 % is dry mill (10 % wet mill) 89 % is natural gas powered (9 % coal, 2.5 % biomass) US corn-ethanol industry growth