A commercial nuclear fusion power plant supplies electricity to a public grid before 2035.

Question

Six frontier AI models put this at 10% by 16 Oct 2036. Full reasoning from every model.

WillHappen.ai · Accepted Answer

10% — the median of 6 frontier models, resolving by 2036-10-16.

Answer

Gemini (Google): 12% — Grid delivery requires engineering beyond scientific breakeven that private pilots cannot license and build inside nine years. Commonwealth Fusion and Helion target grid delivery by 2028-2030, but historical first-of-a-kind energy buildouts slip 3-7 years. Tritium breeding and blanket materials capable of handling commercial neutron flux lack mature full-scale operational testing. A working net-positive pilot connected to a localized microgrid before 2030 would immediately push these odds above 40 percent.

Answer

Claude (Anthropic): 3% — No fusion project has demonstrated net energy gain at pilot-plant scale, let alone grid-connected commercial generation. ITER won't reach full deuterium-tritium operation until the 2030s and is explicitly experimental, not commercial. Private firms like Commonwealth Fusion and TAE target demonstration plants in the early-mid 2030s, with commercial grid supply realistically pushed past 2035. Fusion has a decades-long history of timelines slipping; the one thing that would change this is a surprise net-gain demo plant years ahead of current schedules.

Answer

GPT (OpenAI): 18% — The key hinge is whether a first-of-a-kind plant can convert fusion gain into reliable grid power on a 2030s schedule. Private developers target the early 2030s, but none has yet demonstrated an integrated power plant or sustained commercial fuel cycle. ITER’s first plasma is planned for 2030 and its deuterium-tritium phase later, making it unlikely to validate a grid plant in time. Odds rise sharply if Helion, CFS, or another firm demonstrates sustained net electric output and a grid interconnect by 2030.

Answer

Grok (xAI): 18% — Helion or CFS must finish a licensed FOAK plant in <8 years with no net-electricity demo yet. Helion’s 2028 Microsoft PPA is the only public-grid claim, but they lack net power, a licensed site, and NRC/DOE approval that historically takes 6–10 years post-physics. CFS SPARC net-energy is 2026–28 at best; ARC siting plus FOAK nuclear construction then overruns 2035 on every prior reactor timeline. ITER/national labs stay research-only; a 2027 SPARC Q>1 result would be the single event that most lifts this forecast.

Answer

DeepSeek (DeepSeek): 8% — Commercial fusion on a public grid by 2035 is extremely unlikely given no prototype yet produces net electricity. No fusion device has yet produced net positive electricity; NIF's 2022 ignition yielded 3.15 MJ from 2 MJ of laser energy but zero grid electricity. ITER, the largest public project, won't begin deuterium-tritium operations until 2035 and isn't designed to generate power. Private firms like Commonwealth Fusion and Helion target demo plants in the early-to-mid 2030s, but supplying a public grid requires regulatory approval, turbine…

Answer

Qwen (Alibaba): 3% — No device has achieved net electrical output from fusion; the engineering gap between plasma breakeven and grid-connected power is vast. Even Commonwealth Fusion's most aggressive timeline puts its ARC pilot plant in the early 2030s at best, and pilot ≠ commercial grid supply. Tritium breeding, neutron-resistant materials, and continuous heat extraction remain unsolved at reactor scale—each a multi-year engineering program. A surprise would be Helion or CFS demonstrating sustained Q_eng > 1 by ~2029, which would still leave <5 years for grid integration.

A commercial nuclear fusion power plant supplies electricity to a public grid before 2035.

At least two new commercial nuclear fission reactors begin commercial operation in the United States before 2032.

Global nuclear power generation capacity increases by at least 20 percent by 2035 compared to 2025 levels.

Germany's energy ministry establishes a replacement structure following the dissolution of its wind and solar division.

EU governments agree on a package of measures to tackle energy prices before winter.