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RECEIPT FILE · RF-005

Awaiting decision

Legal Context

Suncor v. Boulder County

Follow the record behind the story.

5 receiptsLast verified Oct 5, 2026
Front of the United States Supreme Court
Context: Kurt Kaiser / CC0. Cropped by TVN.

The Question

Can the Supreme Court decide this case now, and if it can, does federal law preclude Boulder County’s state-law climate-liability claims?

Current Status

The case has been argued but no Supreme Court merits or jurisdictional opinion has issued. Oral argument did not itself change the lower-court judgment or decide whether Boulder’s claims may ultimately proceed.

What Is Established

The Colorado Supreme Court held in May 2025 that Boulder’s state-law claims were not preempted and could proceed. The U.S. Supreme Court granted review of the federal-preclusion question and separately added a jurisdiction question. The case was argued on October 5, 2026.

What Remains Open

The official oral-argument transcript/audio and the Court’s eventual opinion remain the key unresolved records. The transcript may clarify the issues pressed at argument but will not itself be a holding.

Evidence Chain

Primary records in chronological order

  1. Receipt 01

    May 12, 2025 · Colorado Supreme Court

    State supreme court opinion

    Colorado Supreme Court opinion — 2025 CO 21

    What it establishes

    Held that Boulder County and the City of Boulder’s state-law tort claims were not preempted by federal law at that stage and could proceed.

    What it does not establish

    The ruling did not establish liability or damages on the underlying tort claims and was not the final U.S. Supreme Court disposition.

    What changed

    Kept the Colorado state-law claims alive and created the ruling later taken to the U.S. Supreme Court.

  2. Receipt 02

    Feb 23, 2026 · U.S. Supreme Court

    Supreme Court docket / order history

    U.S. Supreme Court docket — certiorari granted and jurisdiction question added

    What it establishes

    The Court granted review and directed the parties to brief both the federal-preclusion issue and whether the Court has statutory and Article III jurisdiction.

    What it does not establish

    A grant of certiorari and an oral-argument entry do not decide either question.

    What changed

    Moved the dispute into Supreme Court merits review while leaving both threshold questions unresolved.

  3. Receipt 03

    Feb 23, 2026 · U.S. Supreme Court

    Questions presented

    Questions Presented — No. 25-170

    What it establishes

    Identifies the two questions before the Court: federal preclusion of the state-law climate claims and the Court’s statutory/Article III jurisdiction.

    What it does not establish

    Questions Presented define the issues for review; they are not findings or answers.

    What changed

    Defines the legal scope of the Supreme Court proceeding.

  4. Receipt 04

    May 14, 2026 · Suncor Energy (U.S.A.) Inc., et al.

    Party merits brief

    Brief for Petitioners — Suncor Energy et al.

    What it establishes

    States the petitioners’ arguments that the Court has jurisdiction and that constitutional structure plus the Clean Air Act preclude Boulder’s claims concerning interstate and international greenhouse-gas emissions.

    What it does not establish

    This is advocacy by the petitioners, not a judicial finding.

    What changed

    Sets out the legal theory asking the Supreme Court to reverse the Colorado ruling.

  5. Receipt 05

    Jul 27, 2026 · County Commissioners of Boulder County, et al.

    Party merits brief

    Brief for Respondents — Boulder County et al.

    What it establishes

    States Boulder’s arguments defending the Colorado Supreme Court’s decision and opposing the petitioners’ federal-preclusion theory and/or the Court’s jurisdictional path to the merits.

    What it does not establish

    This is advocacy by the respondents, not a judicial finding.

    What changed

    Sets out the legal theory for leaving the Colorado state-law claims in place.

What Happens Next

Official oral-argument transcript/audio; any post-argument order; or the Supreme Court’s opinion and judgment.

Related TVN Explainer

Suncor v. Boulder County: What the Supreme Court Is Actually Deciding

Read the full analysis →

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