As previously reported in The Climate Report, the states of Texas and Wyoming, along with industry groups, challenged in the U.S. Court of Appeals for the District of Columbia U.S. EPA's plan for implementing greenhouse gas emissions regulations (State of Texas v. the United States Environmental Protection Agency, No. 10-1425). This latest dispute in a series of legal skirmishes revolved around implementation of Part C permitting requirements in states without implementation plans for greenhouse gases as of January 2, 2011.

Texas, Wyoming, and the industry groups contended that five rules promulgated by EPA were based on impermissible interpretations of the Part C Prevention of Significant Deterioration ("PSD") Program and ran afoul of the Clean Air Act's "orderly process" for revising State Implementation Plans ("SIPs"). Petitioners acknowledged that states were obligated to update their SIPs to incorporate greenhouse gas emissions into their PSD programs but raised procedural and substantive challenges to the timing and methods employed by EPA in requiring revisions to SIPs. Petitioners, moreover, argued that the Clean Air Act permitted states to issue lawful PSD permits under the previously approved SIP during the three-year period to which states were entitled to revise their SIPs. Oral argument was heard on May 7, 2013.

On July 26, 2013, the three-judge panel consisting of Judges Rogers, Tatel, and Kavanaugh, in a 2–1 ruling, dismissed the petitions for lack of jurisdiction, finding that the states and the industry groups lacked Article III standing to challenge the rules. The majority of the court concluded that, pursuant to the plain text of Clean Air Act §§ 165(a) and 167, PSD permitting requirements are self-executing and apply directly to major stationary sources irrespective of an applicable SIP. Specifically, the court held that the industry petitioners failed to show sufficient injury-in-fact to sustain a challenge of the rules because the challenged rules actually mitigate an injury that industry petitioners would have otherwise sustained by not being able to obtain lawful PSD permits until the states revised their SIPs. As to the state petitioners, the court held that vacating the challenged rules would not redress the state's alleged injury to their quasi-sovereign interests in regulating air quality within their borders because the claimed injury was caused by the automatic operation of Section 165(a), rather than the challenged rules.

Judge Kavanaugh dissented, arguing that the EPA rules should be vacated because a long-standing EPA regulation gives states three years to revise their SIPs to incorporate new EPA regulations, and the EPA rules at issue stripped the states of the prescribed period to update their SIPs to include greenhouse gases. In addition, Judge Kavanaugh argued that these states should have been allowed to issue PSD permits under their old SIP during the three-year interim period.

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