By 
Issued on behalf of General Fusion Inc.
General Fusion's LM26 machine compressed a plasma to roughly 0.72 keV — more than tripling its electron temperature through mechanical compression alone — a result the company says validates its practical Magnetized Target Fusion approach as it moves toward going public on Nasdaq under the proposed ticker symbol "GFUZ."
NEW YORK, June 25, 2026 /PRNewswire/ -- Fusion energy has been the punchline of clean-power skeptics for fifty years — always "twenty years away," never here. On June 22, 2026, General Fusion Inc. ("General Fusion") gave that joke a concrete rebuttal. The Vancouver-based company announced that its large-scale Magnetized Target Fusion (MTF) machine, Lawson Machine 26 ("LM26"), heated a plasma to roughly 8.4 million degrees Celsius — about 0.72 keV — not with lasers or exotic magnets, but by mechanically squeezing it. It is the kind of result that moves fusion from a physics promise toward an engineering reality.
The number that matters is the multiple: LM26 recorded a more than threefold increase in electron temperature during mechanical compression, a result the company believes is a unique one for its MTF approach, and important because in MTF the plasma is heated solely by compression after it is formed. General Fusion's next major targeted milestone is 1 keV (around 10 million degrees Celsius), and these results are a measurable step toward it. The findings have been submitted for peer review and posted publicly — a transparency choice that matters in a field where extraordinary claims demand independent scrutiny.
Fusion by Compression, Not by Laser or Superconducting Magnet
Most fusion programs the public has heard of take one of two expensive roads. Tokamaks like ITER use enormous superconducting magnets to confine a plasma. Inertial-confinement programs like the U.S. National Ignition Facility use arrays of high-powered lasers. Both approaches have produced landmark science, but both are capital-intensive and complex to turn into a power plant that sells electricity at a competitive price.
General Fusion's Magnetized Target Fusion takes a different path. The company's approach forms a magnetized plasma and then mechanically compresses it using a metal liner — in LM26's case, a lithium liner — to drive it toward fusion conditions. The pitch is practicality: MTF is designed to avoid both superconducting magnets and high-powered lasers, and to use existing, durable materials that could make a commercial machine cheaper to build and run. In an era when electricity demand is surging and the economics of new power matter as much as the physics, "practical" is the operative word.
LM26 is the first MTF demonstration machine built at what General Fusion calls a commercially relevant scale — roughly 50% of commercial-scale diameter based on current design parameters. The company designed, built, and began operating it in under two years, and since it started running in 2025 it has completed a series of plasma compressions. The June 22 results are the most significant of those to date as it targets key technical milestones of 1 keV, 10 keV, and Lawson criterion.
What the LM26 Results Actually Show
Beyond the headline temperature, the technical paper details several measurements that, taken together, the company says validate LM26's operating principles. Electron temperature rose to approximately 0.72 keV (±0.08), a more than threefold increase during mechanical compression, supported by diagnostics including Thomson scattering and Absolute Extreme Ultraviolet (AXUV) systems. Plasma density and poloidal magnetic field each increased roughly tenfold during compression — results the company describes as similar to or better than those from its prior test beds, but achieved at significantly larger scale.
Three further observations round out the picture: the plasma remained stable until deep into compression; there was no significant contamination of the plasma by the lithium liner during the stable compression phase — a long-standing engineering worry for liner-driven designs; and the machine recorded an observed increase in neutron yield during compression, the signature one wants to see when fusion reactions are occurring. None of this is net energy, and the company is careful to call the results preliminary pending peer review. But the agreement between experiment and the company's modelling is the kind of validation that shows an important step forward on the company's path to commercialization.
"We are forging a new path in fusion with our uniquely practical MTF approach. The results announced today are all key indicators of real-world progress toward our targeted technical milestones with LM26," said Greg Twinney, Chief Executive Officer at General Fusion, who credited collaborators including the UK Atomic Energy Authority, Princeton Plasma Physics Laboratory, and General Atomics for supporting the diagnostic effort.
Voices on the company's advisory committee echoed the framing. Tony Donné, Chair of General Fusion's Science and Technology Advisory Committee and former Chief Executive Officer of EUROfusion, said the observed increases in magnetic field, plasma density, and electron temperature during compression demonstrate substantial technical progress and are consistent with the behavior expected from modelling and simulations — an agreement between experiment and theory that, in his words, provides confidence the planned machine upgrades will unlock more demanding plasma conditions.
A Milestone With a Public-Markets Backdrop
The science arrives at a notable moment for the company's capital story. General Fusion is currently private, but it has agreed to a business combination with Spring Valley Acquisition Corp. III (Nasdaq: SVAC) ("Spring Valley" or "SVAC"), a special-purpose acquisition company. At closing, Spring Valley would be renamed General Fusion Group Ltd., and the combined company's shares and warrants are expected to trade on Nasdaq under the proposed symbols "GFUZ" and "GFUZW" — subject to approval of the listing application. Spring Valley has set an extraordinary general meeting of shareholders for July 6, 2026 to vote on the proposed combination; if approved, the transaction is expected to close shortly thereafter, subject to customary conditions. The SEC declared the related registration statement effective on June 12, 2026.
None of that is a certainty, and nothing here is a recommendation to buy or sell any security or a solicitation of any vote — the transaction remains subject to shareholder approval and customary closing conditions, and investors should rely only on the official proxy and registration materials filed with the SEC. What the LM26 result does is sharpen the question every fusion investor eventually asks: not just "does the physics work?" but "can this team hit its milestones on schedule?" Delivering a tripled electron temperature and clean compression data is, at minimum, favorable on the technical side of that question.
How Investors Can Watch the Fusion Theme Today
Pure-play fusion is famously hard to own: most leading developers — Commonwealth Fusion Systems, TAE Technologies, Helion, Zap Energy — remain private. That scarcity is part of why General Fusion's planned listing has drawn attention. For now, investors tracking the theme tend to watch a mix of the merger vehicle, the enabling supply chain, and the corporates with fusion stakes. Four names frame that spectrum — though each carries its own risk profile and none is a proxy for General Fusion.
Spring Valley Acquisition Corp. III (Nasdaq: SVAC) is slated to merge with General Fusion and the common shares of the combined company are expected to trade under the symbol "GFUZ." Spring Valley vehicles have raised roughly US$920 million across four IPOs and previously completed combinations with NuScale Power and Eagle Nuclear Energy, giving the franchise a track record in the power-infrastructure and decarbonization lane. Its securities carry all the usual SPAC risks: the deal still requires a shareholder vote and customary approvals, and there is no certainty it closes on the expected timeline or at all.
American Superconductor Corporation (Nasdaq: AMSC) represents the enabling supply chain. AMSC is the most direct U.S.-listed pure-play in high-temperature superconducting (HTS) wire — the REBCO tape that magnet-confinement fusion machines depend on — and a handful of manufacturers control the vast majority of that global market. While General Fusion's MTF approach deliberately avoids superconducting magnets, AMSC illustrates how the broader fusion build-out flows into picks-and-shovels suppliers. The company reported record fiscal 2025 revenue of US$299.2 million, up 34% year-over-year, with grid and defense demand driving growth.
Nucor Corporation (NYSE: NUE) stands in for the industrial off-takers betting on fusion as future baseload power. The steelmaker invested US$35 million directly into Helion Energy and signed on as the intended customer for a 500-megawatt Helion plant designed to supply zero-carbon electricity to a Nucor steel mill. It is a reminder that heavy industry — not just tech — is lining up to buy fusion power, and that the demand side of the equation is becoming concrete.
Eni S.p.A. (NYSE: E) rounds out the set as the strategic-investor archetype. The Italian energy major holds a stake in Commonwealth Fusion Systems and has positioned fusion within its longer-term energy-transition strategy. For investors who want fusion optionality inside a cash-generating, dividend-paying major rather than a pre-revenue developer, Eni illustrates how incumbent energy companies are buying a seat at the fusion table without betting the business on it.
Two additional nuclear names round out the watch list for investors drawn to the broader clean-baseload theme. NuScale Power (NYSE: SMR) is the first company to receive U.S. Nuclear Regulatory Commission design approval for its small modular reactor (SMR) designs, with NRC-approved 50-megawatt and 77-megawatt designs and a project pipeline that includes a 6-gigawatt framework with the Tennessee Valley Authority through ENTRA1 Energy; it reported roughly US$1.2 billion in liquidity in its most recent quarter, though it remains pre-commercial with minimal revenue. Oklo (NYSE: OKLO), developing its Aurora powerhouse fast-fission reactors and a fuel-recycling model, has drawn attention through agreements and collaborations with large power buyers and technology partners and held approximately US$2.5 billion in cash and marketable securities in its most recent quarter, while remaining pre-revenue and capital-intensive. Both are SMR developers rather than fusion companies, but they reflect the same surge of investor interest in next-generation, carbon-free baseload power that has lifted the fusion theme.
The common thread is that fusion has crossed from pure science into a fundable, watchable theme — driven by surging electricity demand from AI data centers, electrification, and industry. General Fusion's wager is that the most practical machine, not necessarily the most powerful one, wins the race to commercial fusion. The LM26 result is a data point in its favor.
What to Watch Next
Three markers stand out from here. First, peer review: whether the scientific community validates the compressional-heating results the company has submitted. Second, the 1 keV milestone: whether LM26's planned upgrades to starting plasma parameters deliver the next step up in temperature and density. Third, the completion of the business combination with Spring Valley, which would determine whether General Fusion becomes, by its own account, one of the first publicly traded pure-play fusion companies. For a sector that has lived in the indefinite future, those are unusually concrete near-term dates.
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