Sources have revealed that the US Environmental Protection Agency approved a 2017 hardship waiver from US biofuel laws to Chevron Corp’s Utah refinery earlier this year. The Renewable Fuel Standard (RFS) necessitates refiners to blend biofuels into their fuel pool or instead buy compliance credits from competitors that do. Corn-belt farmers are exasperated because of the waivers which hurt the demand for ethanol and other biofuels.