PacifiCorp v. Environmental Protection Agency
Consolidated with:
| Docket No. | Op. Below | Argument | Opinion | Vote | Author | Term |
|---|---|---|---|---|---|---|
| 23-1068 | 10th Cir. | Mar 25, 2025 | Jun 18, 2025 | 8-0 | Thomas | OT 2024 |
Holding: Under the Clean Air Act, EPA’s disapprovals of the Oklahoma and Utah state implementation plans are locally or regionally applicable actions reviewable in a regional court of appeals.
Judgment: Reversed and remanded, 8-0, in an opinion by Justice Thomas on June 18, 2025. Justice Alito took no part in the consideration or decision of the case.
SCOTUSblog Coverage
- Supreme Court issues two rulings specifying where challenges to EPA actions on clean air must be filed (Amy Howe, June 18, 2025)
- Justices agree to pause briefing on Biden-era loan forgiveness rule (Amy Howe, February 6, 2025)
- Supreme Court takes up Clean Air Act and sentencing cases (Amy Howe, October 21, 2024)
- Redistricting, campaign contributions, and California's role in emissions regulation (John Elwood, October 17, 2024)
- Fourteen cases to watch from the Supreme Court's end-of-summer "long conference" (John Elwood, October 10, 2024)
| Date | Proceedings and Orders |
|---|---|
| 03/28/2024 | Petition for a writ of certiorari filed. (Response due May 1, 2024) |
| 04/23/2024 | Motion to extend the time to file a response from May 1, 2024 to May 21, 2024, submitted to The Clerk. |
| 04/24/2024 | Motion to extend the time to file a response is granted and the time is extended to and including May 21, 2024. |
| 05/21/2024 | Brief for the Federal Respondents filed. VIDED. |
| 05/23/2024 | Waiver of the 14-day waiting period for the distribution of the petition pursuant to Rule 15.5 filed by petitioner. |
| 05/28/2024 | DISTRIBUTED for Conference of 6/13/2024. |
| 05/29/2024 | Rescheduled. |
| 05/30/2024 | Reply of petitioners PacifiCorp, et al. filed. |
| 09/11/2024 | DISTRIBUTED for Conference of 9/30/2024. |
| 10/07/2024 | DISTRIBUTED for Conference of 10/11/2024. |
| 10/15/2024 | DISTRIBUTED for Conference of 10/18/2024. |
| 10/21/2024 | Petition GRANTED. The petition for a writ of certiorari in No. 23-1067 is granted. The cases are consolidated, and a total of one hour is allotted for oral argument. Justice Alito took no part in the consideration or decision of these petitions. VIDED. |
| 10/21/2024 | Because the Court has consolidated these cases for briefing and oral argument, future filings and activity in the cases will now be reflected on the docket of No. 23-1067. Subsequent filings in these cases must therefore be submitted through the electronic filing system in No. 23-1067. Each document submitted in connection with one or more of these cases must include on its cover the case number and caption for each case in which the filing is intended to be submitted. Where a filing is submitted in fewer than all of the cases, the docket entry will reflect the case number(s) in which the filing is submitted; a document filed in all of the consolidated cases will be noted as “VIDED.” |
| 02/10/2025 | SET FOR ARGUMENT on Tuesday, March 25, 2025. VIDED. |
| 02/12/2025 | Record requested from the United States Court of Appeals for the Tenth Circuit. |
| 02/12/2025 | Record received electronically from the United States Court of Appeals for the Tenth Circuit and available with the Clerk. |
| 02/18/2025 | Reply of petitioners PacifiCorp, et al. filed. VIDED. (Distributed) |
| 02/19/2025 | CIRCULATED |
| 03/25/2025 | Argued. For petitioners in 23-1067: Mithun Mansinghani, Oklahoma City, Okla. For petitioners in 23-1068: Misha Tseytlin, Chicago, Ill. For respondents: Malcolm L. Stewart, Deputy Solicitor General, Department of Justice, Washington, D. C. VIDED. |
| 06/18/2025 | Judgment REVERSED and case REMANDED. Thomas, J., delivered the opinion of the Court, in which Sotomayor, Kagan, Kavanaugh, Barrett, and Jackson, JJ., joined. Gorsuch, J., filed an opinion concurring in the judgment, in which Roberts, C. J., joined. Alito, J., took no part in the consideration or decision of the case. VIDED. |