Fusion Startup Helion Reaches $15.5 Billion Valuation and Secures First Commercial Licenses

The race to harness the power of the stars has crossed a major financial and regulatory threshold. Helion Energy, a Washington-based nuclear fusion startup, has closed a $465 million Series G funding round that catapults its valuation to $15.5 billion.[1][6]

Alongside the massive capital injection, Helion achieved an unprecedented regulatory milestone: securing the world's first commercial operating licenses for a fusion power plant. The Washington State Department of Health issued a Radioactive Materials License and a Radioactive Air Emissions License for the company's under-construction Orion facility in Malaga, Washington.[2][5]

The licenses permit Helion to proceed with the construction of the generator building at the Malaga site, where assembly and office structures are already complete. Unlike previous permits issued in the sector, which were strictly for research and development, these are commercial operating approvals.[2][5]

"Leading radioactive regulatory oversight for the fusion industry in Washington state is an honor and is essential to protecting public health while advancing clean energy," said Jill Wood, director of the state's Office of Radiation.[2]

The regulatory breakthrough was made possible by a 2023 U.S. Nuclear Regulatory Commission decision that fusion technology should be regulated more like particle accelerators and hospital equipment than traditional nuclear fission plants. Because fusion does not carry the risk of a runaway meltdown and produces significantly less long-lived radioactive waste, states have been empowered to oversee the facilities.[2]

Helion's financial backing reflects the soaring confidence of private markets. The Series G round was led by Thrive Capital, with participation from Lux Capital, SoftBank Vision Fund 2, Lightspeed Venture Partners, and Ford Motor Company Executive Chairman Bill Ford. The raise brings Helion's total capital to $1.5 billion.[1][4]

The startup is operating on the industry's most aggressive timeline. Helion holds a power purchase agreement with Microsoft to supply 50 megawatts of electricity to a Central Washington data center by 2028. If successful, it would become the first private fusion company to reach commercial power generation.[2][4]

To hit that target, Helion is relying on a unique technological approach. While many competitors use massive, donut-shaped tokamak reactors, Helion utilizes a Field-Reversed Configuration (FRC). Its Polaris prototype uses magnetic fields to compress plasma donuts from opposite ends of a cylinder, accelerating them toward each other at 100 million miles per hour.[1][4]

The resulting collision compresses the fuel—a mix of deuterium and helium-3—creating the intense heat and pressure required for atomic nuclei to fuse. The reaction causes changes in the magnetic field that directly produce an electric current, bypassing the need for traditional steam turbines.[1][4]

Helion recently reported that its Polaris prototype achieved internal plasma temperatures exceeding 150 million degrees Celsius, well above the threshold generally considered necessary for a commercial fusion power plant.[4][5]

Despite the optimism, significant scientific hurdles remain. No company or academic institution has yet achieved "breakeven"—producing more commercially viable energy from a fusion reaction than the massive amount of electricity required to trigger it.[2][3]

Helion's choice of fuel has also sparked internal and external debate. While a standard deuterium-tritium mix offers a much higher energy gain, Helion pivoted to deuterium-helium-3 because it produces protons rather than hard-to-contain neutrons, simplifying the reactor's engineering. However, helium-3 is exceptionally rare on Earth, requiring Helion to manufacture it in-house.[1][4]

The Everett-based company is far from alone in its quest. Total private investment in the fusion sector has now eclipsed $13 billion, with 17 different startups having raised more than $100 million each.[3]

Commonwealth Fusion Systems, an MIT spinout based in Massachusetts, leads the pack with roughly $3 billion in funding. Commonwealth is building a tokamak reactor called SPARC and aims to demonstrate net energy gain by late 2026 or early 2027, targeting commercial power in the early 2030s.[3]

Other major players include California's TAE Technologies, which has raised nearly $1.8 billion, and international contenders like Germany's Focused Energy and the UK's Tokamak Energy.[3]

As data centers and artificial intelligence workloads drive an unprecedented surge in global electricity demand, the promise of fusion has never been more alluring. With billions in the bank and the first commercial licenses in hand, the race to bottle a star is officially moving out of the laboratory and onto the grid.[2][4]