Inside a warehouse in Massachusetts, engineers at Commonwealth Fusion Systems have spent months fine-tuning superconducting magnets designed to confine plasma hotter than the core of the sun. It’s one of many such sites, scattered across the US and Europe, that now make up what industry watchers are calling a race: the private race for commercial nuclear fusion.
The numbers, as of mid-2026, show seventeen companies have each individually raised more than $100 million from private investors, with total sector investment now topping $13 billion, according to figures gathered by TheNextWeb and other independent industry trackers. That’s a figure that would have seemed unthinkable just a few years ago, when fusion was still widely regarded as more of an academic exercise than fertile ground for venture capital.
Commonwealth Fusion Systems remains the best-funded company in the sector, having raised roughly $3.94 billion in total, including a $1 billion round closed in July 2026. The company is developing SPARC, a tokamak reactor that uses high-temperature superconducting magnets to confine extremely hot plasma, and is targeting scientific breakeven, the point at which a reaction produces more energy than it took to trigger it, in 2027.
Helion Energy, backed by Sam Altman and SoftBank, has raised $3.2 billion in total, including a $465 million round closed in June 2026, and plans to deliver electricity to Microsoft by 2028 using a field-reversed configuration design, a different approach from the tokamak Commonwealth Fusion is pursuing.
Behind these two better-known names sits a broader ecosystem, fueled by advances in high-temperature superconducting magnets, AI-driven simulations, and the historical precedent of the scientific breakeven achieved in 2022 at the US National Ignition Facility, a result that convinced many investors fusion was no longer a mirage perpetually fifty years away.
There’s still, of course, the underlying question that has followed this sector for decades: how much of this enthusiasm will translate into energy actually flowing into the grid, and how much will run into the same technical hurdles that have slowed similar promises before. Commonwealth Fusion’s 2027 target and Helion’s 2028 one will offer, over the coming months, the first concrete tests of whether the thirteen billion dollars invested is really buying clean energy, or once again, just buying time.
Verification note: research found no direct, real or documented link between these nuclear fusion startups and the Canary Islands. This article is published as a global science and technology story, without forcing a local connection the facts don’t support.
