PAUL KELLY, JR., Circuit Judge.
Plaintiff-Appellant Sierra Club filed this action on January 29, 2009 under the citizen suit provision of the Clean Air Act ("CAA"), 42 U.S.C. § 7604(a)(3), alleging that Defendant-Appellee Two Elk Generation Partners ("Two Elk") is attempting to build a coal-fired power plant ("Power Plant") with an invalid Prevention of Significant Deterioration ("PSD") permit in violation of the CAA.
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