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ADMINISTRATIVE LAW-DELEGATION OF AUTHORITY

West Virginia v. Environmental Protection Agency, 2022 U.S. LEXIS 3268 (S. Ct. June 30, 2022) (Roberts, C.J.)  The Clean Air Act authorizes the Environmental Protection Agency to regulate power plants by setting a “standard of performance” for their emission of certain pollutants into the air. 84 Stat. 1683, 42 U. S. C. §7411(a)(1). That standard may be different for new and existing plants, but in each case it must reflect the “best system of emission reduction” that the Agency has determined to be “adequately demonstrated” for the particular category. §§7411(a)(1)(b)(1)(d). For existing plants, the States then implement that requirement by issuing rules restricting emissions from sources within their borders.  Since passage of the Act 50 years ago, EPA has exercised this authority by setting performance standards based on measures that would reduce pollution by causing plants to operate more cleanly. In 2015, however, EPA issued a new rule concluding that the “best system of emission reduction” for existing coal-fired power plants included a requirement that such facilities reduce their own production of electricity, or subsidize increased generation by natural gas, wind, or solar sources.  The question before us is whether this broader conception of EPA’s authority is within the power granted to it by the Clean Air Act. Given these circumstances,  our precedent counsels skepticism toward EPA’s claim that Section 111 empowers it to devise carbon emissions caps based on a generation shifting approach. To overcome that skepticism, the Government must—under the major questions doctrine—point to “clear congressional authorization” to regulate in that manner. Utility Air, 573 U. S., at 324, 134 S. Ct. 2427, 189 L. Ed. 2d 372. Capping carbon dioxide emissions at a level that will force a nationwide transition away from the use of coal to generate electricity may be a sensible “solution to the crisis of the day.” New York v. United States, 505 U. S. 144, 187, 112 S. Ct. 2408, 120 L. Ed. 2d 120 (1992). But it is not plausible that Congress gave EPA the authority to adopt on its own such a regulatory scheme in Section 111(d). A decision of such magnitude and consequence rests with Congress itself, or an agency acting pursuant to a clear delegation from that representative body. The judgment of the Court of Appeals for the District of Columbia Circuit is reversed, and the cases are remanded for further proceedings consistent with this opinion.