Canadian fusion company General Fusion says its LM26 machine has heated plasma electrons to 1.1 kiloelectronvolts, or about 12.6 million degrees Celsius (roughly 22.7 million degrees Fahrenheit), a first for its magnetized target fusion approach. The company and the UK Atomic Energy Authority jointly announced the result Oct. 8.

The milestone is real progress — but it is an early step. The measurement is an electron temperature, not the ion temperature that drives fusion reactions, and the technical paper describing it has been submitted for peer review but not yet published.

For energy watchers, the result matters because General Fusion is pursuing a cheaper, mechanical route to fusion than the giant laser and magnet facilities that dominate headlines. If the approach works at scale, it could offer another path toward carbon-free power, though the company's own target for a first plant is around 2035.

Measuring 1.1 keV with Thomson Scattering

General Fusion measured the temperature just before peak compression using Thomson scattering, a laser technique the company calls the gold standard for plasma temperature, according to its announcement. Diagnostic specialists from both organizations designed and commissioned the system, and UKAEA built a key component, a polychromator, at its Culham Campus in England.

"Achieving a plasma electron temperature of over 1 keV marks an important milestone for General Fusion," said Professor Dennis Whyte, chief executive officer of UKAEA. He said the authority looks forward to the outcome of formal peer review and publication in the journal Review of Scientific Instruments.

The result builds on June 2026 tests, when the company reported an electron temperature of about 0.72 keV, or roughly 8.4 million degrees Celsius, during compression, according to a company release at the time. Plasma density and magnetic field each rose about tenfold in those runs.

Squeezing Plasma Inside a Metal Liner

Magnetized target fusion sits between the two best-known fusion strategies. Tokamaks hold plasma steady with powerful magnets for long periods, while laser facilities crush tiny fuel pellets in billionths of a second. General Fusion forms a magnetized plasma and then compresses it mechanically inside a metal liner over milliseconds. The company argues that this slower, mechanical squeeze could be simpler and cheaper to build into a power plant than lasers or very large superconducting magnets.

The company says LM26 is "the first fusion machine in the world to achieve 1 keV with low-speed compression." It also notes that only a few fusion companies have passed 1 keV, all using other approaches. That framing is important: other designs have reached far higher temperatures, and 1 keV is a stepping stone, not a finish line.

Greg Twinney, General Fusion's chief executive officer, called it "an industry-defining result on the path to commercializing cost-effective, practical fusion energy." That language comes from the company itself, which is now publicly traded and has a financial interest in promoting its progress.

Distance Still to Cover Before Net Energy

LM26 has been operating since 2023 at the company's facility in Richmond, British Columbia, near Vancouver, Physics World has reported. General Fusion was founded in 2002 by Michel Laberge and has raised more than $325 million from private investors, including Jeff Bezos, and the Canadian government, according to the same report.

The next target for LM26 is 10 keV, and upgrades to support higher compression ratios are underway. After that, the company aims to approach the Lawson criterion, the combination of temperature, density and confinement time needed for a plasma to produce more fusion energy than it consumes.

The scale of that gap is large — roughly an order of magnitude. Practical fusion power generally requires fuel ions at temperatures around 100 million degrees Celsius or more, several times hotter than the electrons measured in LM26. Ion and electron temperatures can differ significantly in a compressed plasma, and the announcement did not report an ion temperature.

The company's road has been bumpy. In May 2025, General Fusion laid off about a quarter of its roughly 140 staff and scaled back LM26 operations because of what its chief executive called an "unexpected and urgent financing constraint," Physics World reported. The firm has since completed a business combination, listed on the Nasdaq and received support from the Government of Canada's Strategic Response Fund.

The company's own risk disclosures note a history of losses, no commercial revenue and the possibility that LM26 costs through the end of 2028 could exceed expectations. Investors and readers should treat timeline projections, including the 2035 plant target, as goals rather than commitments.

Peer Review and the Push Toward 10 keV

The immediate next step is independent scrutiny. The technical paper, co-authored with UKAEA, is posted on General Fusion's website and has been submitted to Review of Scientific Instruments. Until it clears peer review, the 1.1 keV figure remains a company-reported result backed by a partner organization rather than an independently replicated finding.

For U.S. readers, fusion remains a long-term energy story rather than a near-term factor in electricity bills. No fusion company has yet produced net electricity, and grid-scale plants are not expected before the 2030s at the earliest. Results like this one show which approaches are making measurable progress along the way.

The bottom line is that General Fusion has reached an electron temperature milestone that brings its magnetized target fusion design into the same range other approaches passed earlier. The more meaningful tests will be peer review of this result and whether LM26 can reach its 10 keV goal.

What Readers Want to Know

What did General Fusion achieve?

The company says its LM26 machine heated plasma electrons to 1.1 keV, about 12.6 million degrees Celsius, a first for its magnetized target fusion approach.

Has the result been independently verified?

Not yet. UKAEA co-designed the measurement and co-authored the paper, which has been submitted for peer review but not published.

Is 1 keV hot enough for fusion power?

No. Practical fusion generally needs fuel ions around 100 million degrees Celsius or more. LM26's next target is 10 keV.

What is magnetized target fusion?

It forms a magnetized plasma and compresses it mechanically inside a metal liner over milliseconds, rather than using giant magnets or powerful lasers.

When could General Fusion produce power?

The company targets a first-of-a-kind plant around 2035, but that is a goal and depends on further technical and financial progress.

Does this affect my electricity bill?

No. Fusion is not expected to supply grid power until the 2030s at the earliest.