What is Helion Energy?
Fusion company developing pulsed field-reversed-configuration reactors for direct electricity generation.
- Category
- Fusion energy
- Headquarters
- Everett, WA
- Founded
- 2013
- Employees
- 500+
- Total funding
- $1B+ equity; up to $2.7B incl. milestone commitments
- Valuation
- $5.4B valuation (Jan 2025)
What is Helion Energy?
Helion Energy is a fusion energy company founded in 2013 and headquartered in Everett, WA.
Helion Energy is a fusion energy company founded in 2013 and headquartered in Everett, WA. Fusion company developing pulsed field-reversed-configuration reactors for direct electricity generation. Public revenue is not disclosed; the best scale signals are 500+ employees, $1B+ equity; up to $2.7B incl. milestone commitments in disclosed funding or financing, and named strategic customers, investors, or project partners.
The company operates in a market where buyers care about technical proof, safety, regulatory execution, deployment reliability, and bankable unit economics. Its product surface includes Polaris seventh-generation prototype, Orion commercial plant program, Direct energy recovery, Microsoft 50 MW PPA, with commercialization tied to long sales cycles and real-world deployment milestones.
For sellers, Helion Energy should be treated as a sophisticated technical buyer rather than a conventional SaaS account. Engineering and operations leaders shape architecture, finance and legal shape contract structure, and executives usually become involved when the purchase touches strategic capacity, manufacturing, safety, or regulated deployment.
What does Helion Energy offer?
Helion Energy's product set centers on Polaris seventh-generation prototype, Orion commercial plant program, Direct energy recovery.
- Polaris seventh-generation prototype· Fusion prototype
- Orion commercial plant program· Power generation
- Direct energy recovery· Core technology
- Microsoft 50 MW PPA· Commercial
- Nucor 500 MW partnership· Industrial power
- Helium-3 / deuterium fuel path· Fuel strategy
How does Helion Energy make money?
Helion is pre-commercial but has signed power offtake and industrial partnerships; revenue will come from selling electricity rather than selling reactors as software.
Helion is pre-commercial but has signed power offtake and industrial partnerships; revenue will come from selling electricity rather than selling reactors as software. The company does not publish simple self-serve pricing because contracts are tied to deployment scope, physical capacity, engineering services, risk allocation, and long-term operating obligations.
Commercial pricing is not public. The visible economics are project/offtake based: Microsoft's 50 MW target agreement and Nucor's planned 500 MW steel-power collaboration. Growth is driven by converting technical proof into repeatable commercial deployments, then expanding with customers or partners that can absorb larger volumes, additional sites, or more mission-critical workloads.
Unit economics depend less on seat expansion and more on utilization, manufacturing yield, project execution, contract duration, and the cost of capital. As Helion Energy scales, procurement becomes more formal: vendors should be ready for safety, security, quality, compliance, and finance reviews before broad rollout.
Who leads Helion Energy?
Helion Energy is led by David Kirtley, with technical, commercial, and operating leadership built around fusion energy.
- David KirtleyCo-founder & CEOCo-founder since 2013Leads Helion's reactor roadmap and Microsoft/Nucor commercialization.
- Chris PihlCo-founder & CTOCo-founder since 2013Owns technical architecture for pulsed FRC fusion systems.
- George VotroubekCo-founder & Principal ScientistCo-founder since 2013Senior plasma scientist and prototype contributor.
- Sam AltmanExecutive Chairman / major investorChair since 2021 financingProvides strategic capital and board-level support.
How do you contact Helion Energy's leadership?
Use published company channels first. Personal addresses below are format-following examples using helionenergy.com; verify before outreach unless the address is a role inbox listed as published.
first.last@helionenergy.com (format-following example; verify before outreach)How much funding has Helion Energy raised?
Helion Energy has $1B+ equity; up to $2.7B incl. milestone commitments; latest disclosed valuation/status is $5.4B valuation (Jan 2025).
Helion Energy's disclosed financing history is concentrated in these major public events: 2014: Seed and grants - ~$8.5M; Nov 2021: Series E - $500M plus $1.7B milestones; Jan 2025: Series F - $425M at $5.4B valuation. The latest disclosed valuation or status is $5.4B valuation (Jan 2025), and the company has not disclosed full revenue or profitability.
2014: Seed and grants - ~$8.5M. NASA, DOE, DOD grants and YC/Mithril private capital support early prototypes. Nov 2021: Series E - $500M plus $1.7B milestones. Led by Sam Altman, with milestone commitments tied to commercialization. Jan 2025: Series F - $425M at $5.4B valuation. Investors include Lightspeed, SoftBank Vision Fund 2, Nucor, and existing backers.
The funding signal matters because this is a capital-intensive fusion energy company. Large rounds typically fund facilities, hardware, qualification, regulatory work, safety systems, and commercial teams, so sellers should expect formal technical review, finance scrutiny, security or compliance review, and multi-stakeholder procurement.
How did Helion Energy get here?
Helion Energy's path runs from its 2013 founding through financing, technical proof, and commercial deployment milestones.
- 2013Company foundedDavid Kirtley, John Slough, Chris Pihl, and George Votroubek start Helion.
- 2021Trenta reaches 100M CHelion reports its sixth prototype reached fusion-relevant temperatures.
- May 2023Microsoft 50 MW agreementHelion signs a first-of-kind fusion power purchase agreement targeting 2028 delivery.
- 2024Polaris completed and licensedWashington state license supports operation of the seventh-generation prototype.
- Jan 2025Series F financingHelion raises $425M at a $5.4B valuation.
- Jul 2025Malaga plant work beginsHelion advances plans for a 50 MW plant in Chelan County for Microsoft data centers.
Who are Helion Energy's competitors?
Helion Energy competes with specialized startups and incumbents adjacent to fusion energy.
- Commonwealth Fusion SystemsTokamak/HTS path with SPARC and ARC power-plant roadmap.
- TAE TechnologiesField-reversed configuration company pursuing aneutronic fusion at larger scale.
- Zap EnergySheared-flow-stabilized Z-pinch fusion approach.
- General FusionMagnetized-target fusion with mechanical compression.
- Tokamak EnergyCompact tokamak and HTS magnet competitor.
Helion Energy — frequently asked questions
