In Canada, a little-known fusion start-up is turning into a financial pioneer, using Wall Street as fuel for its next machine and giving investors a rare way to bet directly on fusion power.
Canada’s quiet leap into fusion finance
Vancouver-based General Fusion is set to become the first publicly traded company whose core business is commercial fusion power, with no legacy activities attached.
The firm has struck a deal to merge with Spring Valley Acquisition Corp, a US-listed SPAC — a cash shell created purely to take another company public.
Canada is using the stock market as a test bed for fusion energy, turning a once-experimental field into a listed industry.
The transaction implies a pro forma valuation of around 1 billion dollars, according to figures released by the company. That includes:
- about 100 million euros from an oversubscribed private fundraising round
- nearly 220 million euros from the SPAC’s cash pile, assuming investors do not pull out en masse
This is not just a financial stunt. The money is earmarked to complete and operate General Fusion’s flagship experimental machine, known as Lawson Machine 26, or LM26, and to move quickly towards a grid-scale prototype.
Lawson Machine 26: a full-size dress rehearsal
LM26 is already built and running. It is the company’s first full-scale demonstrator for Magnetized Target Fusion (MTF), a hybrid approach that sits between magnetic confinement and inertial confinement.
Its sole purpose: show that General Fusion’s technology can reach conditions where a fusion plant could produce more energy than it consumes.
The programme is structured around three stepping stones:
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- 1 keV, roughly 10 million degrees Celsius, to stabilise and control the plasma
- 10 keV, around 100 million degrees, where fusion reactions start to become efficient
- achieving the Lawson criterion, a specific combination of temperature, density and confinement time needed for net energy gain
What makes LM26 unusual is its size. The chamber is already about half the diameter of a future commercial reactor. That allows engineers to test not just pure plasma physics, but also issues like components, maintenance, and thermal engineering that a real power plant will face.
By building a demonstrator at half commercial scale, General Fusion is treating fusion less like a lab experiment and more like a prototype power station.
Fusion with pistons instead of giant magnets
Most big fusion projects try to hold plasma with enormous magnetic fields or crush tiny fuel pellets with lasers. General Fusion takes a very different route. It uses mechanical pistons.
In its reactor, dozens of pistons slam into a metal sphere filled with swirling liquid lithium. The synchronized impact sends a compression wave towards the centre, where a pre-heated, magnetised plasma sits waiting.
The lithium plays two crucial roles:
- it forms a liquid inner wall that shields solid components from intense neutron damage
- it absorbs the energy from fusion reactions as heat, which can later drive a turbine
Because the inner surface is liquid, it constantly renews itself. That sidesteps one of the hardest engineering problems in traditional fusion designs: how to build solid walls that survive years of neutron bombardment without becoming brittle and radioactive.
A machine designed like industrial kit
The company’s leadership often compares their planned reactors to industrial diesel engines for the grid: heavy, repetitive, designed to run for years rather than showcase exotic physics.
Instead of pushing magnetic fields or laser technology to extremes, General Fusion focuses on relatively mature mechanical systems, hydraulics and liquid metals. The bet is that easier engineering will translate into lower costs and faster deployment.
The Canadian start-up wants fusion plants that look less like space-age science labs and more like rugged power equipment in an ordinary turbine hall.
A global power system running out of slack
The timing is not accidental. The International Energy Agency expects global electricity demand to rise by 40–50% by 2035. Data centres, heat pumps, electric cars and heavy industry are all chasing clean electrons.
Wind and solar costs have plunged, yet they remain variable sources. Large batteries help, but they add cost and complexity. Gas remains flexible but emits CO₂.
In that setting, a compact, zero-carbon, always-on source of electricity looks attractive. Fusion, once dismissed as “forever 30 years away”, is being reconsidered as a realistic industrial option during the 2030s and 2040s if enough capital arrives quickly.
Private money floods into fusion bets
General Fusion is not alone in sensing a turning point. Private investment in fusion has climbed sharply as tech founders and institutional funds hunt for the next clean energy breakthrough.
US-based Helion Energy, backed by OpenAI chief Sam Altman, recently raised around 400 million dollars to accelerate its own reactor concept. Helion uses strong electromagnetic pulses to compress plasma and aims for direct conversion of fusion energy into electricity, bypassing steam turbines altogether.
General Fusion’s approach sits at the other end of the spectrum: a more mechanical system, using liquids and pistons, and feeding classic thermal turbines. Both companies send the same message to markets: fusion is shifting from long-term research into a race to build commercial plants.
How General Fusion’s method fits into the fusion landscape
General Fusion’s MTF concept slots alongside several other competing designs. Each one tries to solve the central problem of fusion: how to keep an ultra-hot plasma in place long enough, and dense enough, for atomic nuclei to merge.
| Confinement method | Key idea | Typical projects | Main strengths | Main hurdles |
| Magnetic confinement (tokamak) | Use powerful magnets to trap plasma in a donut shape | ITER, JET, EAST | Good confinement and extensive research base | Complex magnets, wall materials under stress |
| Stellarator | Twisted magnetic fields, no plasma current | Wendelstein 7-X | More stable plasma behaviour | Wildly complex geometry and construction |
| Laser-driven inertial fusion | Crush small fuel pellets with intense laser blasts | NIF, LMJ | Extremely high fusion yield per pulse | Repetition rate, laser efficiency |
| Magnetized target fusion | Compress pre-magnetised plasma with mechanical pistons in liquid metal | General Fusion | Compact plant, potential for lower cost | Synchronising pistons, handling hot liquid metals |
What the stock market listing changes
Becoming the first “pure play” fusion company on public markets sends a signal far beyond Canada. It gives pension funds, retail investors and large asset managers a direct vehicle for exposure to fusion, something that until now sat mostly in private equity and government labs.
A listing also brings pressure. Quarterly reporting, share price swings and regulatory scrutiny can clash with the long timelines of advanced energy hardware. Management will have to balance investor appetite for milestones with the slow, careful experimentation that fusion demands.
Public markets can supply the billions fusion needs — but they can also punish delays, technical setbacks and shifting roadmaps.
If General Fusion’s merger goes smoothly and the share price holds, other start-ups might follow with their own listings or SPAC deals. A single Canadian transaction could therefore set a template for financing fusion on both sides of the Atlantic.
Key concepts: Lawson criterion, SPACs and liquid walls
The Lawson criterion in plain terms
The Lawson criterion often appears in fusion papers and presentations. At its core, it’s a threshold: the combination of plasma temperature, density and confinement time needed so that the energy coming out of fusion reactions exceeds the energy pumped in.
Think of shaking a box of balls so hard and so long that they start sticking together faster than you spend effort shaking. LM26 is built to show that General Fusion’s setup can cross that tipping point, at least on an experimental basis.
What a SPAC actually does here
A SPAC, or special purpose acquisition company, floats on a stock exchange with no operating business. It sits on investor cash and then searches for a private target to merge with. Once the fusion company and the SPAC join, the target effectively becomes listed.
For General Fusion, this route offers speed and negotiation flexibility compared with a classic IPO. The risk is that SPACs have had a mixed record, with some post-merger firms seeing sharp share price drops when early investors cash out.
Why liquid metal walls matter
Traditional fusion reactors use solid walls around the plasma, which degrade under the constant assault of fast neutrons. These walls can crack, swell and become radioactive over time, leading to expensive repairs.
By replacing that with a liquid lithium layer, General Fusion can circulate the metal, remove heat efficiently and refresh the inner surface every cycle. That approach, if it scales, could make maintenance more like changing oil in an engine than rebuilding a reactor vessel.
What a future Canadian fusion plant might look like
If the LM26 programme hits its targets, the next step would be a pilot plant feeding power into the grid. That facility might run at a repetition rate of roughly one compression per second, generating a steady stream of heat for turbines.
Such a plant could sit near industrial clusters, supplying both electricity and high-temperature steam for factories or hydrogen production. Its footprint would be far smaller than that of a large hydro dam or offshore wind farm with equivalent annual output.
There are still big questions. Long-term piston reliability, corrosion from hot liquid lithium, tritium handling and regulatory approval all carry real risk. Canada’s nuclear regulator and local communities will expect detailed answers on safety, waste and costs.
Yet by pushing a fusion start-up onto public markets, Canada is turning those questions into live investment debates rather than abstract research topics — and pushing fusion energy one step closer to an everyday part of the energy conversation.