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- Helion Energy
Helion Energy Valuation, Funding & Investors
Helion Energy is valued at $16B as of June 2026.
Last Helion Energy valuation
$16B
Series G · Jun 2026
Last Helion Energy funding round
$465M
Series G · Jun 2026
Cumulative funding Helion Energy raised
$1.5B
across 8 funding rounds
Key investors in Helion Energy
Capricorn Investment Group
Mithril Capital Management
Sam Altman
Y Combinator
Lightspeed Venture Partners
Nucor
About Helion Energy
Helion Energy is an Everett, Washington-headquartered fusion energy company founded in 2013, advancing toward the first fusion power plant for clean electricity production. It has demonstrated prototypes like Trenta and develops the Polaris project for net electricity generation using magneto-inertial fusion. Helion secures a power purchase agreement with Microsoft for delivery of 50 megawatts of fusion power.
Founded
2013
HQ
Website
Status
Privately held
Customer focus
B2B
Revenue model
Usage-based
Valuation
$16B (Jun 2026)
Helion Energy Valuation
Helion Energy is currently valued at $16B, based on its Series G in June 2026.
The $465M round was led by Thrive Capital, with participation from Alta Park Capital, Good Ventures, SoftBank Vision Fund, BoxGroup, Lux Capital and 6 other investors.
Helion Energy's valuation has grown 12x from $1.3B at its Series D in September 2020 to $16B in June 2026, across 5 priced rounds.
Helion Energy valuation by funding round
| Date | Stage | Valuation |
|---|---|---|
| Jun 2026 | Series G | $16B |
| Jan 2025 | Series F | $5.4B |
| Sep 2023 | Strategic investment | $4.2B |
| Nov 2021 | Series E | $3B |
| Sep 2020 | Series D | $1.3B |
Helion Energy Funding History
Helion Energy has raised a total of $1.5B across 8 funding rounds.
Helion Energy's first fundraising round was a $2M seed round in August 2014. The most recent completed round was a $465M Series G in June 2026.
Helion Energy funding rounds
| Date | Stage | Investors | Raised | Valuation | Deal Summary |
|---|---|---|---|---|---|
| Jun 2026 | Series G | Thrive Capital (lead); Alta Park Capital; Good Ventures; SoftBank Vision Fund; BoxGroup; Lux Capital; William Clay Ford, Jr.; Lightspeed Venture Partners; Capricorn Investment Group; Mithril Capital Management; Peak XV Partners; Anti Fund | $465M | $16B | Helion Energy raised 465 million USD in a Series G round led by Thrive Capital, with new participation from Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, and Ford Motor Company Executive Chairman Bill Ford, alongside existing investors; the round valued Helion at 15,500 million USD post-money and brought total capital raised to 1,500 million USD. The company said the funding will accelerate commercial deployment of fusion, scale manufacturing capacity, and expand its ability to deliver clean electricity to customers. The raise comes as Helion continues work toward commercial fusion power and a planned power plant for Microsoft, reinforcing the strategic focus on commercialization and industrial scale-up. Helion is a Washington-based fusion energy company headquartered in Everett, founded to develop fusion power generation technology. Public materials tied to the round describe a Series G financing supporting expansion of operations and manufacturing, but do not provide revenue, EBITDA, employee count, or detailed deal structure beyond equity financing. |
| Jan 2025 | Series F | Good Ventures; Nucor; SoftBank Group; Lightspeed Venture Partners; Sam Altman; Capricorn Investment Group; Mithril Capital Management | $425M | $5.4B | Helion Energy is a fusion energy company based in Everett, Washington, developing technology to generate zero-carbon electricity through fusion power plants. The company focuses on pulsed fusion using deuterium and helium-3, aiming to produce electricity directly without turbines. Key prototypes include Trenta (2021, first private reactor to reach 100 million degrees) and the current seventh-generation Polaris, expected to demonstrate net electricity from fusion. On January 28, 2025, Helion closed a $425 million oversubscribed Series F funding round, bringing total funding raised to over $1 billion. The post-money valuation reached $5.425 billion, with participation from new investors Lightspeed Venture Partners, SoftBank Vision Fund 2, and a major university endowment, alongside existing backers Capricorn Investment Group, Good Ventures (Dustin Moskovitz), Mithril Capital Management, Nucor Corporation, and Sam Altman. Funds will scale commercialization, enhance in-house manufacturing of components like capacitors, expand the workforce from 450 by at least 100 employees, and accelerate reactor production. Helion has secured power purchase agreements, including a 50 MW fusion plant for Microsoft by 2028 and a 500 MW plant for Nucor in the 2030s. These partnerships underscore demand for fusion amid rising electricity needs from AI and data centers. The company plans its first commercial plant in Washington state, positioning itself as a leader in the fusion race with a path to abundant, affordable clean energy. |
| Sep 2023 | Strategic investment | Nucor (lead) | $35M | $4.2B | Helion Energy is a fusion energy company developing magneto-inertial and pulsed magnetic fusion technology to generate controlled fusion reactions without continuous ignition, enabling 24/7 electricity generation as a zero-carbon alternative to fossil fuels. Founded in 2013, Helion's approach reduces complexity and costs compared to traditional fusion methods, positioning the technology as commercially viable and scalable. On September 27, 2023, Nucor Corporation announced a $35 million direct strategic investment in Helion and simultaneously unveiled a landmark partnership agreement to develop a 500-megawatt fusion power plant at a Nucor steelmaking facility, with target operations beginning in 2030. This represented the first fusion energy agreement of this scale globally and demonstrated Nucor's commitment to decarbonizing industrial steel production. Helion had previously secured a May 2023 power purchase agreement with Microsoft to supply at least 50 megawatts of electricity by 2028, establishing the world's first commercial fusion energy agreement. By January 2025, Helion completed a Series F funding round of $425 million, bringing total investment to over $1 billion and valuing the company at $5.425 billion post-money, with participation from new investors Lightspeed Venture Partners and SoftBank Vision Fund 2 alongside existing backers including Sam Altman, Mithril Capital, Capricorn Investment Group, Good Ventures, and Nucor. |
| Nov 2021 | Series E | Sam Altman (lead); Dustin Moskovitz; Capricorn Investment Group; Mithril Capital Management | $500M | $3B | Helion Energy is a fusion energy startup based in Everett, Washington, developing pulsed non-ignition fusion technology to produce zero-carbon electricity. The company announced the close of its $500 million Series E funding round on November 5, 2021, led by Sam Altman, with participation from existing investors including Dustin Moskovitz, Mithril Capital Management, and Capricorn Investment Group. The round achieved a $3 billion post-money valuation and included commitments for an additional $1.7 billion upon reaching key performance milestones. The capital was earmarked to complete construction of Polaris, Helion's seventh-generation fusion generator, intended to demonstrate net electricity production from fusion by 2024. This built on successes from prior prototypes, positioning Helion to advance toward commercial fusion power plants. Sam Altman, serving as executive chairman since 2015, highlighted Helion's promising approach compared to other fusion efforts, emphasizing its startup culture and potential to address climate challenges. Subsequent developments included a 2023 power purchase agreement with Microsoft for 50 megawatts by 2028 and a partnership with Nucor for a 500-megawatt plant by 2030, followed by later funding rounds such as a $425 million Series F in 2025 at $5.4 billion valuation. |
| Sep 2020 | Series D | Dustin Moskovitz (lead); Y Combinator; Sam Altman; Capricorn Investment Group; Mithril Capital Management | $40M | $1.3B | Helion Energy is a clean energy company founded in 2013 committed to developing fusion power technology as a zero-carbon electricity source. The company uses magneto-inertial fusion and pulsed magnetic fusion approaches to build commercial-scale fusion reactors that can provide abundant, reliable baseload power. On September 23, 2020, Helion closed a $40 million Series D funding round led by Dustin Moskovitz, the co-founder and former CEO of Asana and co-founder of Facebook, with participation from existing investors including Mithril Capital Management, Capricorn Investment Group, Y Combinator, and Sam Altman. The round valued the company at $1.25 billion on a post-money basis, bringing total funding to $77.8 million since its founding. The capital was designated to accelerate development of Helion's sixth fusion prototype, Trenta, which was designed to demonstrate the scalability and reliability of the company's fusion technology and provide evidence for a future with abundant, clean, and affordable electricity from fusion. By 2023, Helion had announced major commercial commitments, including a power purchase agreement with Microsoft to deliver electricity from a 50 MW fusion plant starting in 2028 and a customer agreement with Nucor to develop a 500 MW power plant in the 2030s. The company subsequently raised a $500 million Series E in November 2021 and a $425 million Series F in January 2025, eventually growing to a valuation exceeding $5.4 billion. |
| Jan 2019 | Series C | Capricorn Investment Group | $10M | - | Helion Energy raised $10 million in a Series C funding round on January 1, 2019, with Capricorn Investment Group as a key investor. The company develops magneto-inertial fusion and pulsed magnetic fusion technology in the USA. |
| Jan 2016 | Series B | Capricorn Investment Group (lead); Mithril Capital Management | $21M | - | Helion Energy, founded in 2013 and headquartered in Redmond, WA, develops fusion energy technology using pulsed magnetic fields and field-reversed configurations (FRC) to produce zero-carbon electricity. The company has raised over $1 billion across multiple rounds, progressing from early prototypes to advanced systems like the seventh-generation Polaris, aimed at demonstrating net electricity production. Key investors include Sam Altman (OpenAI CEO and executive chairman since 2015), Mithril Capital Management, Capricorn Investment Group, Dustin Moskovitz, SoftBank Vision Fund 2, Lightspeed Venture Partners, and Nucor. Total funding reached $77.8 million by September 2020 after a $40 million Series D valuing the company at $1.25 billion post-money, led by Dustin Moskovitz. Subsequent rounds include a $500 million Series E tranche in 2021 from Sam Altman (at $2.5 billion pre-money), extended with $35 million from Nucor in 2023, and a $425 million oversubscribed Series F in January 2025 led by SoftBank Vision Fund 2 and Lightspeed, achieving a $5.4 billion post-money valuation and over $1 billion total raised. These funds support Polaris construction (targeting net electricity by 2024), U.S. manufacturing scale-up for capacitors, magnets, and semiconductors, and the first fusion power plant. Partnerships like Nucor (2023) and Microsoft (2023 purchase deal noted at over $570 million valuation context) underscore strategic growth, positioning Helion as the most valuable private fusion company. Competitive context includes rapid iteration on prototypes (e.g., Trenta in 2020 for scalability), with goals of 1 cent/kWh fusion power long-term. |
| Aug 2014 | Seed | Mithril Capital Management (lead); Y Combinator; Sam Altman | $2M | - | - |
Who has invested in Helion Energy?
17 investors have backed Helion Energy across its funding rounds, including Capricorn Investment Group, Mithril Capital Management, Sam Altman, Y Combinator, Lightspeed Venture Partners and Nucor.
Lead investors include Thrive Capital, Nucor, Sam Altman, Dustin Moskovitz, Capricorn Investment Group and 1 other investor.
Helion Energy Investors
| Investor | HQ | Rounds | Role | First check |
|---|---|---|---|---|
| 6 | Lead | Jan 2016 | ||
| 6 | Lead | Aug 2014 | ||
| 4 | Lead | Aug 2014 | ||
| 2 | Participant | Jan 2025 | ||
| 2 | Lead | Sep 2023 | ||
| 2 | Participant | Aug 2014 | ||
| 2 | Lead | Sep 2020 | ||
| 2 | Participant | Jan 2025 | ||
| 1 | Participant | Jun 2026 | ||
| 1 | Participant | Jun 2026 | ||
| 1 | Participant | Jan 2025 | ||
| 1 | Participant | Jun 2026 | ||
| 1 | Participant | Jun 2026 | ||
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Start Free TrialHelion Energy Competitors
Helion Energy competitors include listed companies like China Three Gorges, EDP Renewables, Public Power Corporation and GD Power Development, and private ones like Cepsa and Eni Plenitude.
| Company | HQ | Status | Revenue | EBITDA | Valuation | Revenue Multiple |
|---|---|---|---|---|---|---|
| Publicly listed | $4.2B | $3.5B | $15B | 12.0x | ||
| Publicly listed | $3.1B | $1.9B | $15B | 9.0x | ||
| Publicly listed | $11B | $2.2B | $17B | 1.8x | ||
| Publicly listed | $25B | $6.7B | $14B | 2.6x | ||
| Private | - | - | $12B | - | ||
| Private | $7.7B | $417M | $12B | 1.5x |
Helion Energy Public Comps
Helion Energy is still privately-owned, but its public comps include China Three Gorges, EDP Renewables, APA, Doosan, Sunoco, Whitecap Resources, Power Assets Holdings, Tüpraş, Huaneng Power and OMV Petrom.
| Last FY | EV/Revenue | EV/EBITDA | ||||||
|---|---|---|---|---|---|---|---|---|
| Revenue | EBITDA | Last FY | LTM | 2027E | Last FY | LTM | 2027E | |
| $4.2B | $3.5B | 11.5x | 12.0x | 14.1x | 14.1x | |||
| $3.1B | $1.9B | 9.2x | 9.0x | 14.7x | 11.7x | |||
| $8.9B | $5.3B | 2.3x | 2.2x | 3.8x | 3.3x | |||
| $14B | $1.2B | 1.9x | 1.8x | 22.3x | 15.7x | |||
| $25B | $1.8B | 1.2x | 0.7x | 17.0x | 9.4x | |||
| $4.2B | $2.3B | 4.3x | 3.2x | 8.0x | 5.7x | |||
| $880M | $838M | 12.3x | 118.2x | 13.0x | - | |||
| $17B | $885M | 0.8x | 0.6x | 16.2x | 6.2x | |||
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Common questions about Helion Energy
| When was Helion Energy founded? | Helion Energy was founded in 2013. |
| Where is Helion Energy headquartered? | Helion Energy is headquartered in Seattle, WA, United States. |
| Is Helion Energy publicly listed? | No, Helion Energy is a private, VC-backed company. |
| What is Helion Energy's valuation? | Helion Energy was last valued at $16B in its Series G in June 2026. |
| How much funding has Helion Energy raised? | Helion Energy has raised $1.5B across 8 funding rounds. |
| What was Helion Energy's last funding round? | Helion Energy's last funding round was a $465M Series G in June 2026, led by Thrive Capital. |
| Who are Helion Energy's investors? | Helion Energy's investors include Capricorn Investment Group, Mithril Capital Management, Sam Altman, Good Ventures, Nucor, Y Combinator, Dustin Moskovitz, Lightspeed Venture Partners, Alta Park Capital, SoftBank Vision Fund and 7 others. |
| Which companies are comparable to Helion Energy? | Companies comparable to Helion Energy include China Three Gorges, EDP Renewables, Public Power Corporation, GD Power Development, Cepsa and Eni Plenitude. |
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