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On June 17, 2025, the U.S. Environmental Protection Agency (“EPA”) published its proposed “Set 2” rule under the Renewable Fuel Standard (“RFS”) program (the “Set 2 Rule”).

On June 17, 2025 the U.S. Environmental Protection Agency (“EPA”) published a proposed rule to repeal the amendments to the Mercury and Air Toxics Standards (“MATS”) adopted by the Biden administration in 2024.

This week, the U.S. Environmental Protection Agency (EPA) took the penultimate step to granting Texas the authority to directly issue Class VI permits under the Safe Drinking Water Act’s Underground Injection Control (UIC) program for carbon capture and sequestration (CCS) projects when it proposed to approve the State’s primacy application.

On March 14, 2025, President Trump signed legislation disapproving the Environmental Protection Agency’s regulation implementing the Inflation Reduction Act’s tax on methane emissions from the oil and gas sector.

If past is prologue, while the second Trump administration is expected to take a number of actions that could lead to increased volatility with respect to renewable identification number (“RIN”) prices just as the first did, there are signals that the administration may take a more deliberate approach this time to reduce shocks to the RIN market, all the more given the interest in supporting renewable fuel production as a domestic fuel source. And while the California Air Resources Board (“CARB”) took steps last year that impact the ability of biogas projects to generate Low Carbon Fuel Standard (“LCFS”) credits, state legislative headwinds could eventually result in the opening of new environmental credit markets to shore up demand for renewable natural gas (“RNG”). Overall, while significant uncertainty and risk of RIN volatility remains, there continue to be signals from both the federal executive and legislative branches in support of the federal Renewable Fuel Standard (“RFS”).

On February 19, 2025, the Council on Environmental Quality (“CEQ”) released a pre-publication version of an interim final rule (the “Interim Rule”) to rescind all of CEQ’s previous and current regulations implementing the National Environmental Policy Act (“NEPA”) alongside a memorandum (the “Memo”) to federal agencies providing guidance on how agencies should revise their individual NEPA regulations and how they should manage NEPA reviews in the meantime.

In his first two days in office, newly inaugurated President Donald J. Trump signed a flurry of Executive Orders, including several aimed at supporting the traditional energy industry.

After little more than a week in office, there is still plenty of speculation, but priorities of the Trump 2.0 Administration are becoming more concrete.

Vinson & Elkins attorneys discussed how to obtain and defend key air quality permits for power plants.

On August 14, 2024, the United States Court of Appeals for the District of Columbia Circuit (“D.C. Circuit”) released a redacted copy of its opinion in Sinclair Wyoming Refining Co. LLC v. EPA,¹ in which the D.C. Circuit upended the U.S. Environmental Protection Agency’s (“EPA” or the “Agency”) overly restrictive treatment of the Renewable Fuel Standard (“RFS”) program’s small refinery exemption (“SRE”) and mostly vacated a series of denials issued by EPA in 2022 to companies petitioning for the SRE.

The U.S. Environmental Protection Agency (EPA) has issued a final rule (the “Rule”) that substantially expands its Risk Management Program (“RMP”) regulations aimed at preventing chemical accidents.

This program will highlight what you need to know about how these new rules intersect, new compliance and enforcement risks, and how to plan now for operations and upcoming transactions.