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Helion Energy

CleanSeries D+

Building the world's first fusion power plant, enabling a future with unlimited clean electricity.

🌐 www.helionenergy.comLinkedIn📍 WAEst. 2013👥 201-500 employees
1Rounds
2Articles
General InformationHelion Energy is a private fusion power company headquartered in Everett, Washington, founded in 2013 by Dr. David Kirtley and co-founders, with approximately 201–500 employees focused on building the world's first commercial fusion power plant.
Funding & FinancialsHelion has raised over $1 billion in total funding, including a $425 million Series F in January 2025 (valuing the company at $5.4 billion), backed by key investors Sam Altman, SoftBank Vision Fund 2, Lightspeed Venture Partners, Mithril Capital, and Nucor.
Leadership & TeamDr. David Kirtley serves as Founder & CEO, Dr. George Votroubek is Co-Founder & Principal Scientist, Chris Pihl is CTO, and Sam Altman (OpenAI CEO) has served as Executive Chairman since 2015.
Recent ActivityIn February 2026, Helion's Polaris prototype became the first privately funded fusion machine to operate with deuterium-tritium fuel and achieve 150 million degrees Celsius, while the company has broken ground on its first commercial fusion plant (Orion) in Malaga, Washington, targeting Microsoft data center power delivery by 2028.

Highlights

Total Raised
1 rounds
Latest Round
$465
Jul 8, 2026
Stage
Series D+
clean-tech
Employees
201-500
Founded 2013
Headquarters
WA
News Coverage
2 articles
Last: 28d ago
Talent Signals
SEC Filings

Backers

Thrive Capital

Funding History

$465
2026
Series G
SEC Form D   Editorial
Jul 8, 2026
$465 millionSeries G · Editorial

Investors: Thrive Capital

Fusion energy company raised $465 million in Series G funding in June 2026 to build a fusion power plant.

News Coverage 2

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