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20,000 km of tape for one test fusion machine: Proxima's Japan deals are non-binding

20,000 km of tape for one test fusion machine: Proxima's Japan deals are non-binding — Newsmesis editorial illustration
— Newsmesis illustration

What happened

Proxima Fusion says its planned Alpha test machine will need about 20,000 kilometres of high-temperature superconducting tape, and each commercial Stellaris power plant about 40,000 kilometres. The Munich-based stellarator developer signed two memorandums of understanding in Tokyo during German Chancellor Friedrich Merz's visit to Japan: one with cable maker Fujikura on the tape, one with Kyoto Fusioneering on plasma heating and fuel equipment. Neither is a firm order or a commitment to build, per The Next Web. Alpha is not due until the early 2030s.

What we know

The Next Webthenextweb.comEU-Startupseu-startups.com
  • Fujikura and Proxima will study the feasibility of a factory in Lower Saxony, Germany, to produce high-temperature superconducting tape, per The Next Web.
  • Kyoto Fusioneering will work with Proxima on gyrotrons, which use microwaves to heat plasma, and on the fuel cycle that handles hydrogen fuel. It will also bring its technology to Germany's Fusion Hubs programme, per The Next Web.
  • Proxima puts its tape needs at roughly 20,000 km for Alpha and about 40,000 km per Stellaris plant, according to the company as reported by The Next Web.
  • The Fusion Hubs programme was launched this year by Germany's research ministry with €125 million in initial funding, per The Next Web.
  • Proxima raised €411 million in July at a €2.4 billion valuation and employs about 200 people, according to the Max Planck Institute for Plasma Physics as cited by The Next Web.
  • EU-Startups also reports that the Kyoto Fusioneering memorandum was signed during Merz's visit to Japan.

What we don't know yet

  • Whether either memorandum becomes a binding purchase or construction contract is not stated; the sources describe both as preliminary.
  • No tape volumes, prices, delivery dates or factory investment figures have been disclosed.
  • Whether a Fujikura factory in Lower Saxony proves economically viable is unknown; the agreement covers only a feasibility study.
  • Fujikura's capacity is also being sought by US rival Commonwealth Fusion Systems, which reportedly ordered more than 10,000 km of tape last month. That figure comes from Khaleej Times via The Next Web and is not independently confirmed here.

Why it matters

Proxima's tape requirement of 20,000 km for one test machine, and 40,000 km per power plant, shows how much specialised material fusion developers must secure years before any plant runs, and Fujikura is already supplying a US competitor. Germany's goal of hosting the first fusion power plant depends on converting memorandums like these into binding supply contracts.

Claims

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Why you can trust this story

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Verification ledger · 8

  • Claim: Proxima Fusion signed memorandums of understanding with Fujikura and Kyoto Fusioneering in Tokyo during Chancellor Merz's visit to Japan.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: The Fujikura agreement covers a feasibility study of a high-temperature superconducting tape factory in Lower Saxony, Germany.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: The Kyoto Fusioneering agreement covers gyrotron plasma heating and fuel-cycle equipment.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: Neither memorandum is a firm order or a commitment to build.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: Proxima expects to need about 20,000 km of superconducting tape for its Alpha test machine, due in the early 2030s.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: Proxima says each commercial Stellaris power plant would require about 40,000 km of tape.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: Proxima raised €411 million in July at a €2.4 billion valuation, per the Max Planck Institute for Plasma Physics.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one checkable detail was matched against the full text of the cited source.

  • Claim: Commonwealth Fusion Systems ordered more than 10,000 km of tape from Fujikura last month, as reported by Khaleej Times.
    Status: UnconfirmedVerification trailUnverifiedChecked by verification engine

    No automated check against the source text is available.

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