Everett, Washington – Helion Energy, a fusion energy company, announced it has successfully closed its Series G funding round, raising $465 million. This latest investment, led by Thrive Capital, propels the company's post-money valuation to an impressive $15.5 billion, nearly tripling its previous valuation from January 2025. The capital infusion is earmarked to build the industrial and manufacturing foundation necessary to produce fusion generators at an assembly-line scale, accelerating the commercial deployment of fusion technology.
The Series G round saw significant participation from new investors, including Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, and Ford Motor Company Executive Chairman Bill Ford. Existing investors such as Capricorn Technology Impact Funds, Lightspeed Venture Partners, Mithril Capital, Dustin Moskovitz through Good Ventures Foundation, SoftBank Vision Fund 2, and a university endowment fund also reaffirmed their commitment. This brings Helion's total funding to date to $1.5 billion.
David Kirtley, CEO of Helion, confirmed the successful funding round, stating in a tweet, > "Today, we closed our Series G at @Helion_Energy, raising $465M to build the industrial and manufacturing foundation needed to produce fusion generators at an assembly-line scale." He further emphasized that this funding accelerates Helion's ability to deliver clean, reliable, and affordable electricity from fusion within this decade.
The announcement follows several significant milestones for Helion, including its 7th-generation Polaris prototype becoming the first privately funded fusion machine to operate with deuterium-tritium fuel. Polaris also set a company record by exceeding plasma temperatures of 150 million degrees Celsius. Helion's first commercial fusion power plant, Orion, is currently under construction in Malaga, Washington.
The substantial investment reflects a growing interest in the fusion energy sector, driven by the surging global demand for electricity, particularly to power massive data centers for artificial intelligence operations. Helion has already secured agreements to supply electricity to Microsoft by 2028 and to develop a 500MW fusion power plant for Nucor. These partnerships underscore the company's ambition to transition fusion from scientific achievement to commercial reality.
