The Renewable Fuels Association is asking the Environmental Protection Agency for an update on the investigation into certain biofuel feedstock imports and also urged the adoption of stricter feedstock verification requirements for imported used cooking oil (UCO) and tallow.

In a letter this week to EPA Administrator Michael Regan, RFA President and CEO Geoff Cooper noted that monthly tallow and UCO imports combined have jumped from 284 million pounds in 2021 to 2,667 million pounds so far this year. “The recent surge in imports of questionable used cooking oil (UCO) and tallow for biomass-based diesel (BBD) production is suppressing demand and values for domestically produced feedstocks like distillers corn oil and soybean oil, as well as the crops from which those oils are derived,” said Cooper. “Today, nearly one out of every six gallons of U.S.-produced BBD is made from imported UCO or tallow—most of which comes from China and Brazil, two countries that maintain punitive import tariffs on U.S. biofuels.”

Last month, EPA confirmed audits were being conducted of supply chain documentation for certain imported feedstocks, including UCO, used to produce renewable fuel and generate credits under the Renewable Fuel Standard, but no results have been announced by the agency.

“In the event that EPA has completed its investigation, we respectfully ask that the Agency publicly share its findings and information regarding any corrective actions being taken,” Cooper wrote. “If the audits are not yet complete, we ask that the Agency share an update with the public on its progress and an estimated timeline for completion.”

Cooper stressed RFA’s concerns that current regulations, especially record-keeping requirements, are overly lax and “are insufficient to assure the legitimacy of certain imported waste oils, fats, and greases.” RFA called on EPA to engage a standards developing organization to develop test methods to conclusively and quickly differentiate various fats, oils, and greases, just as EPA requires for the differentiation of co-processed starch and cellulosic feedstock from in situ ethanol fermentation.