



The Supreme Court will hear Suncor Energy v. County Commissioners of Boulder County on Oct. 5, 2026, weighing whether federal law blocks states and localities from suing oil companies for climate damage costs. Boulder County sued Suncor and Exxon in 2018, arguing the companies knew about climate change risks from their own scientists' research but funded denial campaigns instead of warning the public.
The Colorado Supreme Court sided with Boulder in 2025, ruling the case concerns public deception and local costs rather than federal emissions regulation, and sent it back for trial. Legal precedent on preemption, including a 1970 Clean Air Act provision preserving state remedies, appears to favor Boulder's position.
A week before arguments, the Court announced Justice Alito will sit out the case without explanation, after facing pressure over his financial holdings in oil companies. His absence raises the possibility of a 4-4 split, which would leave the Colorado ruling, and Boulder's win, standing.
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