Diamond Alternative Energy LLC v. Environmental Protection Agency
U.S. Supreme Court · decided June 20, 2025 · Supreme Court Database (Spaeth)
- Decided
- June 20, 2025
- Term
- October Term 2024
- Vote
- 7–2
- Majority author
- Justice Kavanaugh
- Issue area
- Judicial Power
- Disposition
- Reversed and remanded
- Outcome
- Petitioning party won
- Ideological direction
- Liberal
Opinion excerpt
(Slip Opinion) OCTOBER TERM, 2024 1 Syllabus NOTE: Where it is feasible, a syllabus (headnote) will be released, as is being done in connection with this case, at the time the opinion is issued. The syllabus constitutes no part of the opinion of the Court but has been prepared by the Reporter of Decisions for the convenience of the reader. See United States v. Detroit Timber & Lumber Co., 200 U. S. 321, 337. SUPREME COURT OF THE UNITED STATES Syllabus DIAMOND ALTERNATIVE ENERGY, LLC, ET AL. v. ENVIRONMENTAL PROTECTION AGENCY ET AL. CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE DISTRICT OF COLUMBIA CIRCUIT No. 24–7. Argued April 23, 2025—Decided June 20, 2025 Under the Clean Air Act, the Environmental Protection Agency (EPA) approved California regulations that require automakers to manufac- ture more electric vehicles and fewer gasoline-powered vehicles with a goal of decreasing emissions from liquid fuels. The regulations require automakers to limit average greenhouse-gas emissions across their ve- hicle fleets and manufacture a certain percentage of electric vehicles. Several producers of fuels such as gasoline and ethanol sued EPA in the D. C. Circuit, arguing that EPA lacked authority to approve the California regulations because they target global climate change ra- ther than local California air quality problems as required by the Clean Air Act. They…
Excerpt of a 96,778-character opinion. The full text and citation network load in the interactive viewer above.