Levels for advanced biofuels and cellulosic ethanol were also lower than expected.
The cellulosic standard is one area lowered for 2018.
The U.S. Environmental Protection Agency will require fuel companies to blend 15 billion gallons of conventional renewable fuels into the nation's fuel supply in 2018, in line with the volume it proposed in July and steady with 2017, according to a report from Bloomberg.
The Iowa congressional delegation isn't entirely happy with the EPA's 2018 final fuel volumes under the Renewable Fuel Standard program, but they say it'll have to do. The volume requirements are 19.29 billion gallons for renewable fuel, up from the 19.28 billion gallons; 2.1 billion gallons for biomass-based diesel, up from 2 billion gallons; and 4.29 billion gallons for cellulosic ethanol, up from 4.28 billion gallons. EPA also kept the requirement for biomass-based diesel at 2.1 billion gallons again for 2019.
Iowa congressional delates say the EPA's final rule on Renewable Fuel Standard volumes don't take advantage of the industry's potential for biofuel production.
. Chuck Grassley, R-Iowa, in a Wednesday release provided by his office. Chet Thompson, President and CEO of the American Fuel and Petrochemical Manufacturers, said EPA did "exactly what Senator Grassley demanded, bowing the knee to King Corn". We are an global producer of biomass-based diesel, a developer of renewable chemicals and are North America's largest producer of advanced biofuel.
American Soybean Association President Ron Moore said failing to increase the biodiesel RVO "continues to be a missed opportunity to capitalize on a valuable market for soybean oil", and that EPA should "take another look at biodiesel and the value US soybean farmers bring to the domestic energy discussion".
"The EPA's on-time announcement upholds the statutory targets for conventional biofuels, which will provide much-needed certainty for hard-pressed rural communities", said Growth Energy CEO Emily Skor".
"Administrator Pruitt, therefore, faces the daunting task of implementing a broken program that was based on incorrect assumptions made over a decade ago", Macchiarola said in a statement.
Iowa Senator Joni Ernst points to future numbers of the RFS says, "I am disappointed that the 2019 biodiesel numbers were held flat at the bare minimum level that the Administrator committed to".
EPA officials announced the RFS for conventional ethanol would remain at 15 billion gallons for 2018.
Grassley, Ernst, King, Young, and Loebsack all ended their statements with an emphasis on their continued commitment to advocating for and defending the Renewable Fuel Standard and the USA biofuel industry. She added she would continue to push for higher biodiesel and cellulosic amounts.