U.S. oil refiners that endured years of squeezed margins from renewable fuels are seeing a financial reversal as government policy and market moves drive demand for biofuels higher. Late in March, the U.S. Environmental Protection Agency set record blending levels for biofuels for this year and next, a change that has coincided with rising diesel prices tied to the conflict involving Iran and U.S.-Israeli tensions. Together, those forces have helped revive the economics of biodiesel, renewable diesel and ethanol operations at several large refiners.
The EPA’s plan increases the mandated use of biodiesel and renewable diesel by 60% while continuing the longstanding requirement to blend roughly 15 billion gallons of ethanol into gasoline annually. Those rules effectively create stronger, more predictable demand for biomass-based diesel, prompting refiners to boost production and, in some cases, move results from loss to profit.
Valero Energy, the nation’s largest biofuel producer, reported that its renewable diesel arm swung to a $139 million profit in the first quarter, reversing a $141 million loss in the same quarter a year earlier. Its ethanol business also saw substantial improvement, with profits more than quadrupling over the year. Company executives attributed part of the turnaround to the biofuel mandates, calling them a "pretty strong tailwind."
Other refiners posted similar reversals. HF Sinclair reported a $133 million profit in its renewable diesel segment, after a $17 million loss a year earlier. Phillips 66 said its renewable fuels division significantly narrowed losses, and executives noted its renewable diesel plants are operating above capacity. Brian Mandell, executive vice president of marketing and commercial at Phillips 66, told analysts that investors should expect a "substantial difference" in renewable segment performance compared with a year ago.
Analysts and industry participants point to the role of Renewable Identification Numbers, or RINs, in restoring margins. RIN credits, which are tradable compliance instruments, become available when refiners blend more biofuel than required and can be sold to refiners unable to meet their own blending obligations. Types of RINs include D4 credits for biodiesel and renewable diesel and D6 credits for corn-based ethanol.
John Deal, managing director of capital markets at Post Oak Group, said the new biofuel mandates in effect establish a floor beneath biomass-based diesel demand. Rand Taylor, CEO of Fuel Ox Inc, characterized the higher mandates as providing "multi-year certainty and stronger RINs." Market data show RIN prices have jumped more than 80% this year to trade above $2 per credit, according to LSEG data, lifting the revenue available to refiners that blend in excess of their obligations.
Refiner executives have been open about the change in sentiment. HF Sinclair’s CEO Franklin Myers told investors earlier in the month, "We’ve waited through the hard times. Let’s go harvest these good times," signaling a willingness to capitalize on the strengthened policy and market set-up.
Despite the immediate profit improvement, the industry faces several constraints that cloud the longer-term picture. A number of renewable fuel projects have struggled in recent years, and a return to profitability does not automatically translate into new investment. Some producers have already stepped back from renewable projects: Chevron idled two biodiesel plants in the U.S. Midwest in 2024, and Vertex Energy paused renewable diesel output at its Mobile, Alabama refinery to refocus on traditional fossil fuel processing.
Feedstock availability is a central variable. Strong demand for inputs like soybean oil combined with maintenance-related slowdowns in soy crushing could push up soybean prices, making biodiesel and renewable diesel production more expensive. Traders and analysts warn that rising feedstock costs and short supplies could discourage production and complicate efforts to expand capacity.
At the same time, the spike in diesel prices linked to the Iran war is shifting short-term incentives. Conventional diesel has become notably more lucrative; diesel prices have risen 46% during the conflict, a factor that may prompt some refiners to maximize conventional diesel output rather than increase renewable diesel production. Arif Gasilov, a partner at the Gasilov Group, noted that with tight diesel supplies, producing conventional diesel can deliver stronger short-term returns than investing to expand renewable diesel output.
Geoff Moody, senior vice president of government relations and policy at the American Fuel and Petrochemical Manufacturers, observed that whether the current uptick will represent a sustained shift or only a temporary spike depends on how the interplay between mandates, feedstock markets and diesel prices evolves over time.
For now, mandates and richer RIN values have provided an unexpected profit boost for several refiners, turning units that were previously loss-making into contributors to corporate earnings. But the path from these improved results to new capacity additions is not straightforward. Companies and investors will weigh the allure of current margins against feedstock risk, market volatility and the immediate opportunity presented by higher conventional diesel prices.
Summary
U.S. refiners have seen renewable fuel units move back into profit after the EPA set record biofuel blending mandates and diesel prices rose amid geopolitical tensions. Higher mandatory blending levels and stronger RIN credit values have increased revenue for producers, even as feedstock constraints and an attractive conventional diesel market raise questions about long-term capacity expansion.