Pursuant to the Renewable Fuel Standard (“RFS”), the U.S. Environmental Protection Agency (“U.S. EPA”) issues annual renewable volume obligations (“RVOs”), which set the minimum aggregate volume of renewable fuel that refiners must blend with transportation fuel for the following calendar year.

Refineries producing transportation fuel meet their RVOs by blending the required volume of renewable fuel into gasoline or diesel fuel or by acquiring credits (called renewable identification numbers, or “RINs”). The RFS permits “small” refineries – those producing fewer than 75,000 barrels of fuel per day – to claim an exemption by showing that meeting their RVOs would cause them “disproportionate economic hardship.”