Sierra Club petitions the Environmental Appeals Board (“Board”) to review a greenhouse gas (“GHG”) prevention of significant deterioration permit that Region 6 (“Region”) of the United States Environmental Protection Agency (“EPA”) issued to the La Paloma Energy Center, LLC (“LPEC”) pursuant to Clean Air Act §165, 42 U.S.C. §7475. The permit authorizes LPEC to construct and operate a 637- to 735-megawatt natural gas-fired power plant in Harlingen, Texas.