Fusion Power's $100M Club: The Startups Chasing the Sun — and Billions

Fusion power used to be the tech industry's favorite punchline — always a decade away, always a joke. Not anymore.

Over the last several years, fusion startups have raised serious money, with dozens of companies now sitting on over $100 million in funding each. The technology may still be brutally hard to master, but investors are betting it could upend trillion-dollar energy markets.

These startups are chasing what sounds like science fiction: harnessing the nuclear reaction that powers the sun to generate nearly limitless energy here on Earth. If they succeed, fusion could replace fossil fuels and traditional nuclear power with clean, abundant electricity.

The money is real. Companies like Commonwealth Fusion Systems, TAE Technologies, and General Fusion have each raised hundreds of millions from venture capital firms, energy giants, and even billionaires like Jeff Bezos and Bill Gates. The total investment in private fusion companies has now passed $6 billion globally, according to the Fusion Industry Association.

The challenge is immense. Fusion requires heating plasma to over 100 million degrees Celsius and containing it with powerful magnets — a feat of engineering that has stumped scientists for decades. No startup has yet produced more energy than it consumes, which is the key milestone for commercial viability.

But the pace of progress has accelerated. In 2022, the National Ignition Facility at Lawrence Livermore National Laboratory achieved a net energy gain in a fusion experiment for the first time, proving the science works. Startups are now racing to turn that breakthrough into a working power plant.

The US government has also stepped in. The Department of Energy launched a public-private fusion program called the Bold Decadal Vision, aiming to demonstrate a commercial fusion plant by the 2030s. The agency has awarded millions in grants to startups like Zap Energy and Helion Energy.

Helion, in particular, has drawn attention for signing a deal with Microsoft to deliver fusion power by 2028 — an aggressive timeline that many experts call optimistic. But Helion has raised over $500 million and has backing from Sam Altman, the CEO of OpenAI.

For now, fusion remains a high-risk, high-reward bet. The startups burning through cash must solve fundamental physics problems before they can sell a single kilowatt. But if even one of them succeeds, the payoff — clean, limitless energy — could change everything.