What is Helion?
Helion is an advanced energy technology firm dedicated to solving the global demand for reliable, affordable, and clean electricity. By leveraging patented fusion technologies, the company is engineering a power plant architecture that utilizes fuel derived from water, offering a scalable alternative to traditional fossil fuel-based energy sources. As the company moves through its current lifecycle stage, it is transitioning from experimental research into large-scale infrastructure deployment, positioning itself as a critical player in the global transition toward sustainable energy independence.
How much funding has Helion raised?
Helion has raised a total of $1.5B across 7 funding rounds:
Series A
$1.5M
Private Equity
$10.6M
Series C
$10M
Series D
$40M
Series E
$500M
Series F
$425M
Series G
$465M
Series A (2014): $1.5M with participation from Y Combinator and Mithril Capital
Private Equity (2015): $10.6M led by Undisclosed
Series C (2019): $10M, investors not publicly disclosed
Series D (2020): $40M featuring Dustin Moskovitz
Series E (2021): $500M backed by Capricorn Investment Group, Dustin Moskovitz, Sam Altman, and Mithril Capital
Series F (2025): $425M with participation from Nucor, Lightspeed Venture Partners, Softbank Vision Fund, Capricorn Investment Group, Good Ventures, and Mithril Capital Management
Series G (2026): $465M led by Mithril Capital Management, Thrive Capital, antifund.com, Good Ventures, Lux Capital, Softbank Vision Fund, Boxgroup Ventures, Peak XV Partners, Alta Park Capital, Lightspeed Venture Partners, and Capricorn Investment Group
Key Investors in Helion
Mithril Capital Management
Mithril Capital is a family of long-term venture capital funds that is agnostic to sector and geography, focusing on industries ripe for transformation.
Lightspeed Venture Partners
Lightspeed Venture Partners is a global multistage venture capital firm that invests in early and growth-stage technology companies across sectors such as enterprise software and infrastructure.
Capricorn Investment Group
Capricorn Investment Group manages diversified portfolios with a strong focus on sustainable, climate, and impact investments, backing companies addressing global environmental challenges.
What's next for Helion?
With the successful closure of its most recent financing round, Helion is well-positioned to scale its operational capabilities and advance its pilot programs toward commercial readiness. The strategic focus will likely shift toward optimizing the efficiency of its fusion reactors and establishing the supply chain necessary for mass-market deployment. By maintaining a robust balance sheet, Helion is prepared to navigate the capital-intensive requirements of the energy sector, ensuring that its technology can effectively compete with existing grid infrastructure while meeting the urgent global mandate for decarbonization.
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