Procedural Posture and Parties

On March 9, 2026, the Fifth Circuit docketed case No. 23-60069, a consolidated petition for review of an EPA final rule published at 88 Fed. Reg. 9336-9384. The petitioner coalition is exceptionally broad, encompassing three states (Texas, Louisiana, and Mississippi), their respective environmental quality departments, the Public Utility Commission of Texas, and the Railroad Commission of Texas. Private petitioners include major electric utilities—Luminant Generation Company and its affiliated power facilities (Coleto Creek Power, Ennis Power Company, Hays Energy, Midlothian Energy, Oak Grove Management Company, and Wise County Power Company), Mississippi Power Company, and Entergy Louisiana—along with industry trade associations including the Texas Oil & Gas Association, Louisiana Mid-Continent Oil and Gas Association, Association of Electric Companies of Texas, BCCA Appeal Group, Texas Chemical Council, Louisiana Chemical Association, and Louisiana Electric Utility Environmental Group. Texas Lehigh Cement Company also joined as a petitioner.

The Regulatory Framework at Issue

The challenged EPA rule, published at 88 Fed. Reg. 9336-9384, addresses regional haze requirements under the Clean Air Act. Regional haze regulations govern visibility impairment in mandatory Class I federal areas such as national parks and wilderness areas, and typically require states to develop State Implementation Plans (SIPs) ensuring reasonable progress toward national visibility goals. The rule at issue establishes requirements affecting industrial facilities including power generation plants, petrochemical facilities, and cement manufacturing operations.

Industry and State Alignment

The petitioner alignment reflects significant economic stakes for the oil and gas sector and power generation industry across the Gulf Coast states. The participation of the Railroad Commission of Texas—the state's oil and gas regulatory authority—as a petitioner is particularly notable, signaling concerns about the rule's implications for production facilities under the Commission's jurisdiction. The coordinated challenge by state environmental agencies (Texas Commission on Environmental Quality, Mississippi Department of Environmental Quality, and Louisiana Department of Environmental Quality) alongside private industry demonstrates a unified front against EPA's regional haze determinations. The involvement of entities like Texas Lehigh Cement Company, the BCCA Appeal Group, and the Louisiana Electric Utility Environmental Group illustrates the rule's impact across multiple energy-intensive industrial sectors beyond traditional power generation.

Legal Representation

The petitioners are represented by multiple law firms with significant environmental and administrative law practices. The Texas Attorney General's Office is representing the State of Texas and state agencies. Private petitioners retained firms including Baker Botts L.L.P. (representing the Association of Electric Companies of Texas, Texas Oil & Gas Association, Entergy Louisiana, and Texas Lehigh Cement), Balch & Bingham L.L.P. (representing Luminant Generation and its affiliates, as well as Mississippi Power Company), and Kean Miller L.L.P. (representing Louisiana industry associations). The federal respondents—EPA and Administrator Lee Zeldin—are represented by the U.S. Department of Justice Environment & Natural Resources Division under Attorney General Merrick Garland.