Constitutional & Appeals

Suncor Energy v. Boulder County

U.S. Supreme Court (from the Colorado Supreme Court), No. 25-170

Where it stands

Argued Oct. 5, 2026, the first argument of the term. Decision pending.

Next up

No further court date is scheduled.

The question

Does federal law preclude state-law claims seeking relief for injuries allegedly caused by interstate and international greenhouse-gas emissions? And does the Court have jurisdiction to hear the case?

Why it matters

Dozens of cities and states have filed similar suits against energy companies. A ruling on preemption decides whether those claims can proceed in state courts at all.

Timeline

  1. Argued as the first case of October Term 2026. (source)
  2. Certiorari granted. (source)

Sources