Fusion Energy
What people say
Fusion is always "30 years away." Recent headlines about net energy gain at NIF and record plasma durations at ITER and JET have revived the narrative that commercial fusion power is imminent. Startups like Commonwealth Fusion Systems, Helion, and TAE Technologies promise demonstration plants by the early 2030s. The story: fusion will solve climate change — clean, limitless, safe.
What's actually true
Fusion faces fundamental engineering challenges beyond achieving breakeven in a single shot. NIF's "net energy gain" in December 2022 accounted only for the energy delivered to the fuel pellet, not the ~400 MJ required to fire the lasers — the facility-level efficiency is below 1%. Tritium breeding (required to sustain D-T fusion) remains unproven at scale. There are currently no operating tritium breeding blankets anywhere in the world. The ITER project is years behind schedule and billions over budget, with first plasma pushed past 2035. Even the most optimistic startup timelines assume engineering problems that have never been solved at commercial scale. Fusion may eventually work — but the "30 years away" joke persists because the engineering gap between laboratory physics and grid-connected power plant is vast and underappreciated in popular coverage.
Key Evidence
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report NIF Fusion Shot N221204 — LLNL Report
Lawrence Livermore National Laboratory's official report on the December 2022 shot achieving scientific breakeven.
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report ITER Project Timeline (2024 Baseline)
Official ITER project milestones document showing first plasma delayed to 2035+.
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report IAEA Review of Tritium Breeding Technologies
International Atomic Energy Agency review of tritium breeding blanket technologies — none demonstrated at scale.