Fifth Circuit Hears Oral Arguments on Texas Challenge to EPA Interstate Ozone Transport Rules

NEW ORLEANS, LA — A three-judge panel of the 5th U.S. Circuit Court of Appeals heard intense oral arguments Thursday morning in State of Texas v. Environmental Protection Agency, evaluating whether federal regulators exceeded statutory authority in disapproving Texas's State Implementation Plan (SIP) under the Clean Air Act’s 'Good Neighbor Provision.'

Statutory Framework and Interstate Smog Controls

The litigation challenges the EPA's Federal Implementation Plan (FIP) requiring Texas petrochemical refineries, natural gas pipeline compressors, and power generation stations to install selective catalytic reduction systems to curb nitrogen oxide emissions that drift into downwind states. Texas Solicitor General Aaron Nielson argued that the EPA applied arbitrary modeling assumptions and failed to adequately assess economic costs to Texas energy consumers under Section 110(a)(2)(D) of the Clean Air Act.

Justice Department attorneys defending the rule presented air monitoring data demonstrating that emissions from the Houston-Galveston and Dallas-Fort Worth industrial corridors significantly contribute to ozone nonattainment in Oklahoma and Louisiana.

Industrial Compliance and Grid Reliability

The Electric Reliability Council of Texas (ERCOT) submitted amicus filings warning that rapid mandated retrofits could force premature retirements of thermal generation units, threatening electric grid stability during summer peak air conditioning demand.

Downwind state attorneys general and environmental health organizations countered that industrial emissions controls are technologically feasible and essential to protect regional respiratory health.

Decision Window and Appellate Next Steps

The appellate panel took the matter under advisement, with a formal written opinion expected before the end of the calendar year.