Helion raises $465M Series G at $15.5B valuation for fusion push

Helion, a Washington-based fusion energy company, has closed a $465 million Series G funding round to accelerate the commercial deployment of its fusion power technology and expand U.S. manufacturing capacity. The new capital lifts Helion’s total funding to approximately $1.5 billion and sets a post-money valuation of $15.5 billion, nearly tripling its valuation since its Series F round in early 2025.

The round was led by Thrive Capital, with new investors including Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, and Ford Motor Company Executive Chairman Bill Ford joining the cap table. Existing backers 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 participated. Helion plans to use the proceeds to scale production at its Omega manufacturing facility in Everett, Washington and advance construction of its first commercial power plant, Orion, in Malaga, Washington, positioning the company to deliver fusion-based clean electricity later this decade.