In Iowa, Iowa’s biodiesel plants produced 244 million gallons in 2025, down 31% from 353 million gallons in 2024. Only eight facilities reported production in 2025, with several running off and on, well under capacity. The industry faced great uncertainty in 2025 due to both low Renewable Fuel Standard (RFS) blending levels and a lapse in federal tax policy.
When it comes to Iowa biodiesel production, soybean oil use spiked, accounting for 92 percent of the production in 2025. Animal fats, used cooking oil (UCO), and corn oil each accounted for less than 5 percent of feedstocks. Iowa’s biodiesel plants have the capacity to produce over 400 million gallons annually if running at full capacity. The IRFA compiled production information from a confidential industry survey.
