A commercial nuclear fusion reactor begins supplying electricity under a power purchase agreement before 2032.

Question

Six frontier AI models put this at 9% by 1 Oct 2036. Full reasoning from every model.

WillHappen.ai · Accepted Answer

9% — the median of 6 frontier models, resolving by 2036-10-01.

Answer

Gemini (Google): 14% — Unproven net electric gain must transition to licensed, utility-grade plant engineering in under six years. Helion and CFS target 2028-2030 grid power, but novel energy hardware historically slips by 3 to 5 years past pilot milestones. No commercial design has yet demonstrated net electricity (Q_eng > 1), leaving zero margin for regulatory and grid interconnect delays. A verified net-electric continuous burn by Helion or Commonwealth by late 2027 would push odds well above 35%.

Answer

Claude (Anthropic): 9% — Hinges on Helion, CFS or similar hitting net-engineering-gain and demo-plant delivery by 2031, which no plasma physics group has done. Helion's PPA with Microsoft targets 2028 but no fusion device has ever produced net electrical output, so a 2028-2031 commercial delivery requires skipping steps no one… Fusion timelines have slipped by years to decades historically (ITER, NIF, every prior 'commercial fusion by 20XX' claim), so base rate for hitting an aggressive… Regulatory licensing (NRC), engineering scale-up from lab shots to continuous grid output, and tritium fuel cycle issues all remain unresolved and typically add years…

Answer

GPT (OpenAI): 9% — It hinges on one private plant proving net-electric, reliable operation and clearing nuclear licensing before 2032. No private fusion project has produced net electricity; the leading promised 2028–30 dates imply a historically unprecedented scale-up. Helion, CFS and others must finish a first-of-kind plant, secure permits, interconnect, and meet contracted availability by 2031. A sustained grid-power demonstration from Helion’s Polaris-class machine by 2028 would materially raise the odds.

Answer

Grok (xAI): 12% — Any private firm must actually deliver net power under a signed PPA by end-2031. Helion-Microsoft PPA targets 2028 but still needs a net-electricity demo then a FOAK plant; none yet exist. Even small fission plants routinely take >5 years to build; fusion FOAK plus NRC licensing will exceed that. A 2027 net-power shot plus fast permitting would raise odds, but tritium/He-3 and materials remain blockers.

Answer

DeepSeek (DeepSeek): 9% — No private fusion device has ever produced net electricity, so a signed PPA delivering power by 2032 requires a physics first. Commonwealth Fusion's ARC in Chesterfield, Virginia targets ~2030s operation, but SPARC must first demonstrate Q>1, now slipping toward 2027. Helion's 2028 Microsoft PPA and TAE's 2030s deals are non-binding or contingent; no fusion device has reached scientific breakeven since NIF's 2022 single shot. Base rate for first-of-a-kind energy plants hitting a 6-year target is near zero; ITER is 20+ years late, so 9% reflects only a genuine surprise scenario.

Answer

Qwen (Alibaba): 8% — Even the most optimistic private fusion timelines (Commonwealth, Helion) face first-of-a-kind engineering delays that push past 2032. Commonwealth Fusion targets mid-2030s for SPARC→ARC; Helion's 2028 Microsoft PPA already slipped once and requires net-electricity demo first. No fusion device has yet achieved sustained net electricity output; the gap between plasma physics milestones and a grid-connected plant is typically 10+ years. A development that would raise this: Helion or CFS demonstrating sustained net-electricity generation before 2029, which would compress the engineering timeline.

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