U.S. biodiesel producers face a steep climb in 2026 as the Environmental Protection Agency (EPA) has set the most ambitious biofuel blending mandates in history. The agency’s decision, announced in late March amid surging fuel prices related to the U.S.-Israeli war on Iran, requires a level of output that many in the industry say will be difficult to achieve given the sector’s recent struggles.
The EPA established biodiesel and renewable diesel volume requirements of 5.4 billion gallons for 2026 and 5.7 billion gallons for 2027, up from 3.35 billion gallons reported for last year. Because some domestically produced biofuels are exported or otherwise fail to generate compliance credits, the EPA estimates that actually meeting the new obligations will necessitate roughly 6.07 billion gallons of supply this year.
Compliance mechanics and the RIN bank
Under the Renewable Fuel Standard, refiners and other parties obligated under the program must blend prescribed volumes of biofuels into the U.S. fuel supply annually or buy compliance credits, called RINs, from those who exceed blending requirements. If the industry cannot meet the EPA’s blending targets, obligated parties will draw down previously generated credits - known in the trade as the RIN bank - to comply. That drawdown could tighten the market for credits and lift their prices, which in turn may feed into higher diesel costs for consumers.
Scott Irwin, an agricultural economist at the University of Illinois and a widely cited biofuels expert, quantified the scale of the challenge. He estimates obligated parties must generate 915 million credits per month to satisfy the EPA’s mandates. Latest EPA data through April 16 show credits generated from biodiesel (D4) blending rose to 651 million in March, up from 481 million in February. "We are not even remotely close to what we need. It seems obvious that we’re headed for some big deficits and a big deficit build into 2027," Irwin said.
The U.S. Energy Information Administration (EIA) has also flagged a gap: in its Short-Term Energy Outlook it forecast U.S. supply of about 1.52 billion gallons of biodiesel and 3.53 billion gallons of renewable diesel in 2026, a combined total that falls short of the EPA’s requirement.
Industry response - scrambling to boost production
Executives and trade groups say they are working to increase output where possible but face significant operational and supply-chain challenges after a year in which demand for biofuels was weak and many plants were idled or operated below capacity.
Paul Winters, director of public affairs and federal communications at the Clean Fuels Alliance of America, which represents renewable fuel producers, said coordination of feedstock supplies and distribution logistics will determine whether the sector can reach higher volumes. He noted that U.S. producers delivered 5 billion gallons of biofuel to the marketplace in 2024, showing that higher throughput is possible, "but it is entirely about getting these supply chains working together." Winters added that meeting the mandates likely will require biodiesel and renewable diesel plants to run at high utilization rates and potentially add capacity.
The American Fuel and Petrochemical Manufacturers (AFPM), which represents refiners, has argued the EPA’s targets go beyond what domestic feedstock supplies can support and warned the mandates will increase compliance costs. AFPM did not respond to requests for comment for this article.
Midwestern producers signal readiness - but practical limits remain
In the Midwest, where a substantial portion of U.S. biodiesel production is concentrated, operators have begun restarting idle facilities and ramping output following the EPA announcement. Iowa, which accounts for more than 23% of U.S. biodiesel production, has seen plants that were idle earlier in the year bring operations back online as quickly as possible, according to Monte Shaw, executive director of the Iowa Renewable Fuels Association. He cautioned, however, that reaching the state’s combined annual output of 400 million barrels will be difficult without clarity from the Trump administration on how producers can secure clean fuel credits under a new program called 45Z. "With one quarter of the year already gone ... that adds pressure," Shaw said.
To the north, Minnesota Soybean Processors, which integrates a soy crush facility and biodiesel production, restarted its idled Brewster plant within a week of the EPA announcement. The company said the Brewster facility is ramping toward 35 million gallons of output this year, up from 25 million gallons in 2025. "The demand signal is big ... and we’re ready," Jeramie Weller, general manager of Minnesota Soybean Processors, said.
Producers emphasize that running existing plants at full capacity is feasible with time, yet expanding capacity beyond current operable levels presents hurdles. Steel and aluminum tariffs have raised construction costs and lingering logistical and labor bottlenecks complicate new builds.
Capacity figures and the production shortfall
EIA data indicate that as of January 1, 2026, the U.S. had 1.96 billion gallons of operable biodiesel capacity and 4.89 billion gallons of operable capacity for renewable diesel and other biofuels, including sustainable aviation fuel - a combined operable base that would appear likely to satisfy the 2026 quotas on a theoretical basis. In practice, actual output fell well short: combined biodiesel and renewable diesel production in 2025 totaled only 2.9 billion gallons.
Although soybean supplies are currently described as ample, traders and analysts expect those inventories to tighten by the fourth quarter if biodiesel production rises materially. That tightening would add upward pressure to feedstock markets.
Outlook and incentives
Industry representatives say the EPA’s mandates, while challenging, create strong market incentives to grow production. Paul Winters said the policy signal has the potential to drive investment and capacity utilization, calling the market opportunity "huge." Nonetheless, achieving the required levels will depend on aligning feedstock flows, securing credits under emerging programs such as 45Z, and resolving construction and logistics constraints that could limit near-term expansion.
Given the scale of the increase the EPA is seeking and the current state of production and credits, analysts and trade groups warn there is a real possibility of RIN deficits that would push obligated parties to draw on the RIN bank and raise compliance costs - a dynamic that could contribute to higher diesel prices for consumers.
Key statistics reiterated
- EPA mandates: 5.4 billion gallons for 2026 and 5.7 billion gallons for 2027, up from 3.35 billion gallons in the prior year.
- EPA estimated required supply to meet mandates: 6.07 billion gallons for 2026.
- Scott Irwin estimate of required credits: 915 million RINs per month.
- D4 biodiesel credits: 651 million in March versus 481 million in February (EPA data through April 16).
- EIA forecast for 2026: 1.52 billion gallons biodiesel and 3.53 billion gallons renewable diesel.
- Operable capacity as of January 1, 2026: 1.96 billion gallons biodiesel; 4.89 billion gallons renewable diesel and other biofuels.
- Actual combined production in 2025: 2.9 billion gallons.
The scale of the EPA’s mandates, the current production record, and the operational constraints described by producers together frame a clear near-term challenge for the U.S. biodiesel sector. Whether the industry can marshal the required feedstocks, labor and logistics to meet the targets - and how markets respond if it cannot - will be variables to watch in the months ahead.