Helion Energy
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Investors
Founders
About
Helion Energy is a fusion energy company headquartered in Everett, Washington, working to commercialize fusion power generation 1. The company signed an agreement with Microsoft in 2023 to deliver electricity from a Central Washington fusion power plant by 2028 — the most ambitious commercial timeline in the fusion sector 12. Helion is led by co-founder and CEO David Kirtley, who has stated the company is best positioned to generate electricity from fusion this decade 13.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-06-04 | Series G | $465M | Thrive Capital | Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, Bill Ford, Capricorn Technology Impact Funds, Lightspeed Venture Partners, Mithril Capital, Good Ventures Foundation, SoftBank Vision Fund 2 123 |
The Series G brings Helion’s total funding to approximately $1.5 billion at a $15.5 billion post-money valuation 23.
What Investors Say
No independently sourced investor commentary on this round has been published beyond the company press release at time of publication.
What Founders Say
“We don’t want to theorize about fusion. We just want to go build it.”
— David Kirtley, Co-Founder & CEO, Helion Energy 2
Sources
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Helion Energy press release, “Helion Raises $465 Million Series G Funding Round to Meet Surging Global Demand for Power,” June 4, 2026. Accessed June 2026. https://www.helionenergy.com/newsroom/helion-raises-465-million-series-g-funding-round-to-meet-surging-global-demand-for-power↩↩↩↩
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TechCrunch, “Helion, the Sam Altman-backed fusion startup, raises $465M to build a power plant for Microsoft,” June 4, 2026. Accessed June 2026. https://techcrunch.com/2026/06/04/helion-the-sam-altman-backed-fusion-startup-raises-465m-to-build-a-power-plant-for-microsoft/↩↩↩↩
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GeekWire, “Helion hits $15.5B valuation with $465M in new cash as it aims to commercialize fusion this decade,” June 4, 2026. Accessed June 2026. https://www.geekwire.com/2026/helion-hits-15-5b-valuation-with-465m-in-new-cash-to-commercialize-fusion-this-decade/↩↩↩