The Environmental Protection Agency (EPA) has issued a final rule that establishes criteria for determining what biofuels meet the renewable fuels standard of the Energy Independence and Security Act (EISA). 75 Fed. Reg. 14,669 (03/26/10). Under EISA, the nation’s fuel supply must include 36 billion gallons of ethanol or other renewable fuel by 2022, with 21 billion gallons derived from cellulosic sources of biomass, such as switch grass or crop residues. The rule makes four primary changes to the volumetric requirements of the existing renewable fuels program (RFP): (i) it substantially increases the required volumes and extends the time frame over which the volumes ramp up through at least 2022; (ii) it divides the total renewable fuel requirement into four separate categories, each with its own volume requirement, (iii) it requires, with certain exceptions applicable to existing facilities, that each of the mandated volumes achieve certain minimum thresholds of greenhouse gas (GHG) emission performance; and (iv) it requires that all renewable fuel be made from feedstocks that meet the definition of renewable biomass including certain land use descriptions. The rule is effective July 1, 2010.