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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.

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.