Fuel and Fields: U.S. Oil and Biofuels Align

Marathon and Valero engage with regulators to expand renewable diesel amid shifting fuel standards.

27 Mar 2025

Marathon Petroleum and Valero, two leading U.S. oil refiners, are participating in discussions with federal regulators to reform the Renewable Fuel Standard (RFS), signalling a notable shift in the country’s energy policy landscape. The talks focus on increasing mandates for renewable diesel, a low-carbon fuel compatible with current diesel engines.

Renewable diesel has gained attention for its potential to reduce emissions while utilising existing fuel infrastructure. Its wider adoption is driving investments in refinery upgrades and boosting demand for agricultural inputs such as soybeans and canola, which serve as key feedstocks.

Historically, the oil refining and biofuel sectors have held opposing views on the RFS, but recent developments show a growing alignment. Industry groups, including the American Petroleum Institute, have moved towards a more cooperative approach with biofuel producers, reflecting a shared interest in balancing traditional fuels with renewable alternatives.

An industry analyst noted, “This is no longer a zero-sum game. A unified strategy could unlock growth while strengthening energy resilience.”

If blending requirements increase, refiners are expected to expand renewable diesel production and retrofit existing plants. The agricultural sector may also experience shifts in crop choices and pricing due to higher feedstock demand. Investors are monitoring renewable fuel supply chains as potential areas for long-term expansion.

Despite the momentum, challenges remain. Feedstock availability constraints and concerns from smaller refiners over compliance costs could complicate implementation. Nevertheless, stakeholders express cautious optimism that a balanced policy framework can reconcile environmental objectives with economic feasibility.

The final details of the RFS reform are yet to be determined, but this emerging cooperation signals a potential turning point for the U.S. biofuel market, paving the way for a more integrated and lower-carbon energy future.