Diamond Alternative Energy LLC v. Environmental Protection Agency

Docket No.	Op. Below	Argument	Opinion	Vote	Author	Term
24-7	D.C. Cir.	Apr 23, 2025	Jun 20, 2025	7-2	Kavanaugh	OT 2024

Holding: The fuel producers have Article III standing to challenge the EPA’s approval under the Clean Air Act of California regulations requiring automakers to manufacture more electric vehicles and fewer gasoline-powered vehicles.

Judgment: Reversed and remanded, 7-2, in an opinion by Justice Kavanaugh on June 20, 2025. Justices Sotomayor and Jackson filed dissenting opinions.

SCOTUSblog Coverage

Just the Fax (Mark Walsh, June 20, 2025)
Additional opinions from Friday, June 20 (SCOTUSblog, June 20, 2025)
April session to feature religious charter school case and challenge to LGBTQ+ books in schools (Amy Howe, February 24, 2025)
Justices agree to pause briefing on Biden-era loan forgiveness rule (Amy Howe, February 6, 2025)
Trump asks justices for pause in four cases to reconsider Biden policies (Amy Howe, January 24, 2025)
Justices take up cases on religious tax exemption and California climate change mandate (Amy Howe, December 13, 2024)
Sacred sites, religious tax exemptions, and whether to reconsider Feres (John Elwood, December 12, 2024)
Personal jurisdiction, habeas, and a possible replacement case (John Elwood, December 6, 2024)
Nondelegation doctrine, abortion clinic protest, and transgender student athletes (John Elwood, November 22, 2024)
Wisconsin parents challenge school support plan for transgender students (John Elwood, November 7, 2024)
Timing rules for reviewing deportation decisions concerning persecution or torture risk (John Elwood, October 31, 2024)
Redistricting, campaign contributions, and California's role in emissions regulation (John Elwood, October 17, 2024)

Date	Proceedings and Orders (key to color coding)
07/02/2024	Petition for a writ of certiorari filed. (Response due August 7, 2024)
07/26/2024	Motion to extend the time to file a response from August 7, 2024 to September 7, 2024, submitted to The Clerk.
07/29/2024	Motion to extend the time to file a response is granted and the time is extended to and including September 9, 2024, for all respondents.
08/01/2024	Motion of the Solictor General to extend the time to file a response from August 7, 2024 to September 6, 2024, submitted to The Clerk.
08/05/2024	Motion to extend the time to file a response is granted. The time to file responses has been extended to and including September 9, 2024, for all respondents.
08/06/2024	Brief amici curiae of Organizations Committed to Constitutional Government filed. VIDED.
08/07/2024	Brief amici curiae of Texas Oil & Gas Association, et al. filed.
08/07/2024	Brief amicus curiae of ConservAmerica filed.
08/07/2024	Brief amicus curiae of American Petroleum Institute filed.
08/07/2024	Brief amicus curiae of Competitive Enterprise Institute filed.
08/07/2024	Brief amicus curiae of The Sulphur Institute filed.
08/07/2024	Brief amici curiae of Texas Royalty Council, et al. filed.
08/07/2024	Brief amici curiae of Specialty Equipment Market Association, et al. filed. VIDED
08/07/2024	Brief amici curiae of Western States Petroleum Association, et al. filed.
08/07/2024	Brief amicus curiae of The Two Hundred for Homeownership filed.
08/07/2024	Brief amici curiae of Advancing American Freedom, et al. filed.
08/07/2024	Brief amici curiae of Chamber of Commerce of the United States of America, et al. filed.
08/07/2024	Brief amici curiae of California Business Roundtable, et al. filed.
09/09/2024	Brief of State Respondents in opposition filed. VIDED.
09/09/2024	Brief of Federal Respondents in opposition filed.
09/09/2024	Waiver of right of respondents Natural Resources Defense Council, Inc., et al. to respond filed.
09/23/2024	Reply of petitioners Diamond Alternative Energy, LLC, et al. filed. (Distributed)
09/25/2024	DISTRIBUTED for Conference of 10/11/2024.
10/15/2024	DISTRIBUTED for Conference of 10/18/2024.
10/23/2024	Letter of October 23, 2024 from counsel for petitioners filed. (Distributed)
10/28/2024	DISTRIBUTED for Conference of 11/1/2024.
10/29/2024	Letter of October 29, 2024, of California et al., in response filed. (Distributed)
11/04/2024	DISTRIBUTED for Conference of 11/8/2024.
11/12/2024	DISTRIBUTED for Conference of 11/15/2024.
11/18/2024	DISTRIBUTED for Conference of 11/22/2024.
12/02/2024	DISTRIBUTED for Conference of 12/6/2024.
12/09/2024	DISTRIBUTED for Conference of 12/13/2024.
12/13/2024	Petition GRANTED limited to Question 1 presented by the petition.
01/24/2025	Motion to hold the briefing schedule in abeyance filed by federal respondents. (Distributed)
01/27/2025	Brief of petitioners Diamond Alternative Energy, LLC, et al. filed.
01/27/2025	Joint appendix filed.
01/29/2025	Response in opposition to motion to hold the briefing schedule in abeyance from petitioners Diamond Alternative Energy, LLC, et al. filed. (Distributed)
01/31/2025	Brief amici curiae of Foothill Church and Cedar Park Assembly of God of Kirkland, Washington filed.
02/03/2025	Brief amicus curiae of The Two Hundred for Homeownership filed.
02/03/2025	Brief amicus curiae of ConservAmerica filed.
02/03/2025	Brief amicus curiae of American Petroleum Institute filed.
02/03/2025	Brief amicus curiae of The Sulphur Institute filed.
02/03/2025	Brief amici curiae of Advancing American Freedom, et al. filed.
02/03/2025	Brief amici curiae of Our Children’s Trust, et al. in support of neither party filed.
02/03/2025	Brief amici curiae of Western States Petroleum Association, et al. filed.
02/03/2025	Brief amici curiae of Chamber of Commerce of the United States of America, et al. filed.
02/03/2025	Brief amici curiae of Texas Oil & Gas Association, et al. filed.
02/03/2025	Brief amici curiae of Texas Royalty Council, et al. filed.
02/03/2025	Brief amicus curiae of Cato Institute filed.
02/06/2025	Motion of the federal respondents to hold the briefing schedule in abeyance DENIED.
02/10/2025	Motion of respondents for an extension of time within which to file respondents' briefs on the merits filed.
02/13/2025	Motion of respondents to extend the time to file respondents' briefs on the merits granted and the time is extended to and including March 12, 2025.
02/24/2025	SET FOR ARGUMENT on Wednesday, April 23, 2025.
02/27/2025	Record requested from the United States Court of Appeals for the District of Columbia Circuit.
03/12/2025	Record received electronically from the United States Court of Appeals for the District of Columbia Circuit and available with the Clerk.
03/12/2025	Brief of federal respondents filed.
03/12/2025	Brief of state respondents filed.
03/12/2025	Letter of respondents Natural Resources Defense Council, et al. (the public interest organizations) notifying the Clerk they do not intend to file a brief on the merits filed.
03/18/2025	Brief amicus curiae of Professor F. Andrew Hessick filed. (Distributed)
03/19/2025	CIRCULATED
03/19/2025	Motion for divided argument filed by the Acting Solicitor General.
03/19/2025	Brief amici curiae of International Council on Clean Transportation, et al. filed. (Distributed)
03/19/2025	Brief amici curiae of Professor Heather Elliott, et al. filed. (Distributed)
03/31/2025	Motion for divided argument filed by the Acting Solicitor General GRANTED.
04/09/2025	Reply of petitioners Diamond Alternative Energy, LLC, et al. filed. (Distributed)
04/23/2025	Argued. For petitioners: Jeffrey B. Wall, Washington, D. C. For federal respondents: Edwin S. Kneedler, Deputy Solicitor General, Department of Justice, Washington, D. C. For state respondents: Joshua A. Klein, Deputy Solicitor General, Oakland, Cal.
06/20/2025	Judgment REVERSED and case REMANDED. Kavanaugh, J., delivered the opinion of the Court, in which Roberts, C. J., and Thomas, Alito, Kagan, Gorsuch, and Barrett, JJ., joined. Sotomayor, J., and Jackson, J., filed dissenting opinions.