In Sierra Club v. FERC, No. 24-1199 (D.C. Cir. Aug. 1, 2025), the U.S. Court of Appeals for the District of Columbia Circuit (D.C. Circuit) upheld the Federal Energy Regulatory Commission’s (FERC) approval of a 1,000-foot natural gas pipeline segment crossing the United States-Mexico border (the Border Pipeline) under section 3 of the Natural Gas Act (NGA), rejecting environmental groups’ challenges that FERC improperly limited its analysis under both the NGA and the National Environmental Policy Act (NEPA), as related to a 155-mile intrastate “Connector Pipeline” constructed upstream of the Border Pipeline in Texas.