A commercial nuclear fusion plant supplies electricity to a power grid before 2036.

Question

Six frontier AI models put this at 13% by 23 Sept 2036. Full reasoning from every model.

WillHappen.ai · Accepted Answer

13% — the median of 6 frontier models, resolving by 2036-09-23.

Answer

Gemini (Google): 14% — Grid-connected fusion by 2036 hinges on private ventures compressing pilot construction and net-power demonstration into under ten years. Public mega-projects like ITER will not deliver power before the late 2030s, leaving success entirely to well-funded private startups. Front-runners like Commonwealth Fusion Systems and Helion target 2028-2032 grid demos, but first-of-a-kind engineering delays routinely add 4-6 years. A working demo producing net-electric output by 2029 with swift NRC licensing would raise these odds above 40%.

Answer

Claude (Anthropic): 4% — Success hinges on whether any fusion project can achieve net electric output and grid connection within ~10 years, a leap no current effort is close to. No fusion device has yet produced net electrical output; ITER (experimental, not grid-connected) delayed fusion power demonstration to the 2030s-2040s. Private firms like Commonwealth Fusion and Helion target pilot plants by early-2030s, but these are demonstration/prototype scale, not grid-supplying commercial plants. Historical base rate for fusion timeline promises is poor—every past 'decades away' estimate has slipped further, and engineering/materials challenges remain unresolved.

Answer

GPT (OpenAI): 31% — The key hinge is whether any leading pilot can convert promising physics into a licensed, grid-connected plant on schedule. CFS targets early-2030s delivery and Helion targets 2028, but neither has yet operated a commercial net-electric plant. A first grid export needs repeatable net power, turbine or direct-conversion integration, fuel handling, licensing, and transmission approval. Historically fusion schedules have slipped for decades; a sustained high-power demonstration by 2029 would raise this sharply.

Answer

Grok (xAI): 18% — A private firm must convert an unproven net-electric demo into a licensed, grid-tied commercial plant inside ~9 years. Helion’s 2028 Microsoft PPA is the only near-term path, yet pulsed-FPP physics and tritium handling remain unvalidated at plant scale. CFS SPARC net-gain ~2027 still leaves ARC needing NRC-style licensing plus construction, historically 8–12 years even for fission. Fusion schedules have slipped 2–3× for 50 years; only a working net-electric prototype by 2029 would move this above ~25.

Answer

DeepSeek (DeepSeek): 12% — Whether any private fusion developer can turn net-energy shots into a grid-connected commercial plant within roughly ten years. No fusion device has yet produced net electricity; NIF's 2022 ignition was laser energy gain, not grid power, and ITER won't run D-T until 2035. Commonwealth Fusion's SPARC targets net energy around 2027 and ARC ~2030s, but no developer has a licensed, financed commercial plant under construction today. Base rate for first-of-a-kind energy plants from concept to grid is 15-25 years; fusion's unresolved tritium breeding and materials issues push it below that.

Answer

Qwen (Alibaba): 2% — No fusion project has even begun building a grid-connected plant; the engineering and licensing timeline alone exceeds 10 years. ITER won't achieve first plasma until ~2035 and doesn't generate electricity; DEMO-class successors target 2040s at earliest. Private firms (Commonwealth, TAE, Helion) claim 2030s demos, but none has a licensed reactor design or construction permit from any regulator. Even fission plants take 8-12 years from license to grid connection; no fusion entity has started that process, making a 2036 grid connection essentially impossible.

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