The annual blending mandate for advanced biofuels was increased by 15 % for 2019 by the US Environmental Protection Agency ( EPA ) . Rules for conventional biofuels were unchanged . The change covered 4.92 billion gallons of advanced biofuel that could be produced from plant and animal waste , instead of the proposed 4.88 billion and the 4.29 billion for 2018 . “The primary reason why we’re not reallocating in this rule is because we have no idea what the volume of SREs (Small Refinery Exemptions) will be for calendar 2019 US Renewable Fuel Standards meant oil refiners had to blend a certain amount of oil into their products each year or buy blending credits from producers which did . The approach created a booming market for biofuels , but critics said the rules could be expensive .
The annual blending mandate for advanced biofuels was increased by 15 % for 2019 by the US Environmental Protection Agency ( EPA ) . Rules for conventional biofuels were unchanged . The change covered 4.92 billion gallons of advanced biofuel that could be produced from plant and animal waste , instead of the proposed 4.88 billion and the 4.29 billion for 2018 . US Renewable Fuel Standards meant oil refiners had to blend a certain amount of oil into their products each year or buy blending credits from producers which did . The approach created a booming market for biofuels , but critics said the rules could be expensive .