The US EPA finalizes the repeal of carbon standards for gas and coal power plants.

Question

Six frontier AI models put this at 76% by 16 Sept 2027. Full reasoning from every model.

WillHappen.ai · Accepted Answer

76% — the median of 6 frontier models, resolving by 2027-09-16.

Answer

Gemini (Google): 74% — Rule repeals hinge on whether EPA can navigate notice-and-comment requirements before procedural or legal stays intervene. Deregulatory EPA administrations typically take 18 to 24 months to finalize a full APA-compliant Section 111 rule repeal. A 12-month remaining window from late 2026 provides sufficient runway if the proposed repeal was published earlier in the cycle. A procedural vacatur by the D.C. Circuit mooting the repeal or severe OIRA review bottlenecks would sharply lower this timeline.

Answer

Claude (Anthropic): 72% — Whether EPA completes the final rulemaking and defeats near-certain legal challenges before publication takes effect. EPA under the current administration has publicly committed to repealing the Clean Power Plan-style rules and proposed repeal in 2025. Rulemaking timelines for major EPA rules often stretch 1-2 years with notice-and-comment, OMB review, and possible litigation delays, but the Sept 2027 deadline gives… Litigation could stall or vacate the rule post-publication, but the question only asks about finalization/publication, not survival in court, which favors a higher…

Answer

GPT (OpenAI): 78% — The outcome chiefly depends on EPA completing APA rulemaking before a court or political reversal interrupts it. EPA must publish a proposed rule, review comments, obtain interagency clearance, and file a final rule by September 16, 2027. A year is usually enough for an administration-priority repeal; EPA repealed Clean Power Plan-era rules through final rules in prior terms. A court stay, a delayed proposal, or a change in congressional control that constrains EPA funding would most reduce the odds.

Answer

Grok (xAI): 82% — EPA must publish a final repeal of the 2024 CAA 111 power-plant GHG standards in the Federal Register. Trump EPA (in office since Jan 2025) has publicly committed to repeal; Reuters ‘poised’ language implies a proposal already in or near OIRA. APA comment + OIRA review typically takes 8–14 months once proposed, leaving ample time before Sept 2027. Trump-1 major energy rollbacks that reached proposal almost always finalized; only a late legal or inter-agency stall would drop this below ~80.

Answer

DeepSeek (DeepSeek): 88% — The EPA has already proposed this repeal; the only real question is whether the final rule clears OMB review and lands in the Federal Register before the deadline. EPA Administrator Zeldin signed the proposed repeal in June 2025, so the agency has had over a year to complete the final rulemaking. The rule must clear OMB's Office of Information and Regulatory Affairs, which typically takes 30-90 days, then publish in the Federal Register. The 2024 Loper Bright and West Virginia v. EPA precedents give the agency strong legal footing to repeal, lowering litigation risk of reversal.

Answer

Qwen (Alibaba): 72% — Turns on whether EPA clears OMB review and litigation stays before the 2027 deadline. EPA under the current administration has signaled intent to repeal, but the rulemaking must survive OMB/OIRA review and public comment, which typically adds 6-12 months… The Clean Air Act Section 111 rules face procedural requirements (proposed rule, comment period, response to comments) that have historically taken 12-18 months from… A development that would shift this significantly: if a court issues a stay on the underlying rules or if EPA fast-tracks via an interim final rule, probability rises…

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