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Helion<\/a>, the fusion startup backed by Sam Altman, announced on Thursday that it had raised $465 million in a new funding round that values the company at $15.5 billion.<\/p>\n The cash infusion lands as Helion is racing to complete Orion, its first power plant. The startup has set an aggressive timeline to deploy fusion power to the grid, as early as 2028 if it can deliver on the terms of its deal with Microsoft<\/a>.\u00a0<\/p>\n The startup last raised $425 million in January 2025<\/a>. Altogether, Helion said it has raised $1.5 billion.<\/p>\n The new round, a Series G, was led by Thrive Capital with a long list of participants, including new investors Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, and Bill Ford, along with existing investors, which include Capricorn Technology Impact Funds, Lightspeed Venture Partners, Mithril Capital, Dustin Moskovitz through Good Ventures Foundation, SoftBank Vision Fund 2, and a university endowment fund.<\/p>\n Helion\u2019s approach to fusion power differs from many of its peers. Some use magnets to contain the superheated plasma required for fusion conditions, while others use lasers to compress fusion fuel until it reacts. In both cases, the majority of startups plan to use steam turbines to transform the intense heat into electricity.<\/p>\n But Helion, which uses magnets to compress the fuel, intends to harvest electricity straight from the magnets themselves. When fusion occurs in the plasma inside the reactor, it expands, pushing against the magnetic fields. That force can be drawn off the magnets as electricity, similar to how an electric vehicle can reverse its motors to provide braking force and recharge the battery.<\/p>\n Such a configuration would dramatically improve the efficiency of a fusion power plant. But some fusion experts are skeptical<\/a> it could work. That\u2019s in part because Helion, unlike many of its competitors, doesn\u2019t frequently publish in peer-reviewed journals, so physicists haven\u2019t been able to poke at the theoretical underpinnings. David Kirtley, Helion\u2019s CEO, argues that eventual results from the company\u2019s fusion devices should be sufficient. \u201cWe don\u2019t want to theorize about fusion,\u201d he told me last year. \u201cWe just want to go build it.\u201d<\/p>\n Helion isn\u2019t alone in attracting fresh funding. The fusion sector has become an investor darling in recent months. Focused Energy and Thea Energy both announced new rounds last week: Focused for $240 million<\/a>, Thea for $100 million<\/a>. In February, Inertia Energy emerged from stealth with a $450 million Series A<\/a>, and the month before, Type One Energy said it was in the process of raising $250 million<\/a> for a Series B.<\/p>\n The investments have poured in despite fusion\u2019s lengthy timeline. Though several companies have made progress in recent months on milestones they say pave the way to a viable power plant, most predict they won\u2019t begin operating their first commercial-scale power plant until the middle of the next decade at the earliest.<\/p>\n Part of the appeal is fusion\u2019s potential to deliver nearly limitless amounts of always-on energy using little more than seawater. For AI-focused tech companies, that\u2019s an attractive proposition. But it also has the potential to disrupt other trillion-dollar energy markets if fusion power companies can aggressively drive costs down. The timelines might be a bit longer than VCs are used to, but the potential payoff could be a lot bigger.<\/p>\n<\/div>\n When you purchase through links in our articles, we may earn a small commission<\/a>. This doesn\u2019t affect our editorial independence.<\/em><\/p>\n