The case is Arizona Public Service Company v. EPA (opinion). An excerpt:
Arizona Public Service Company (“APS”), operator and majority owner of the Four Corners Power Plant (“Plant”), and Sierra Club, Diné CARE, Diné for the C-Aquifer, and San Juan Citizens Alliance (collectively “Environmentalists”) challenge a regulation promulgated by the U.S. Environmental Protection Agency (“EPA”). The regulation at issue is known as a source-specific, federal implementation plan (“federal plan”) and was enacted pursuant to sections 301(a)and (d)(4) of the Clean Air Act, 42 U.S.C. §§ 7601(a) and (d)(4). The federal plan limits particular air emissions from the Plant. We have jurisdiction pursuant to section 307(b)(1) of the Act, 42 U.S.C. § 7607(b)(1). Because all parties agreethat the federal plan provision pertaining to fugitive dust should be remanded, see infra Part II, we do not address this emissions limit in our discussion of the facts. We grant the EPA’s motion for voluntary remand and grant in part and deny in part the petitions for review.
Here are the materials:
Turtle Talk 