Helion Energy
Fusion energy startup backed by Sam Altman pursuing direct-electricity-conversion power
Energy
📍 Everett, WA
Founded 2013
Current Valuation
$5.4B
as of 2024-Q4
UNICORN
Helion is developing a pulsed magneto-inertial fusion reactor that captures electricity directly from expanding plasma without a steam turbine. Signed a 50 MW power purchase agreement with Microsoft, promising delivery by 2028. Sam Altman is the chairman and largest individual investor.
Company Profile
Last Round
Series F — $425M (Jan 2025) · Lead: SoftBank
IPO Status
no imminent plans
Founders & Key People
David KirtleyGeorge VotroubekJohn SloughChris Pihl
Investors
Sam Altman · Mithril Capital · Capricorn · Dustin Moskovitz · Reid Hoffman · SoftBank
Products
- Polaris (7th-gen prototype)
- Orion (8th-gen, planned for power delivery)
Competitors
Commonwealth Fusion · TAE Technologies · Tokamak Energy
FusionEnergySam AltmanDirect Energy Conversion
Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2024-Q4. Refreshed quarterly.