About
Helion is a fusion energy startup focused on developing a commercial fusion power plant. They have achieved significant milestones, including reaching 150 million degrees Celsius in their Polaris prototype reactor and operating with deuterium-tritium fuel. Helion's unique approach involves a field-reversed configuration reactor that directly generates electricity from fusion reactions, aiming for higher efficiency than traditional methods.
Key facts
At-a-glance profile data
- Website
- helionenergy.com
- Headquarters
- Everett, Washington, USA
- Founded
- 2013
- Employees
- 521
- Total funding
- $3.6B (Series G)
- Business model
- B2B
Funding rounds
| Date | Round | Amount | Post-money | Lead investors |
|---|---|---|---|---|
| 4 Jun 2026 | Series G | $465M | $15.5B | Thrive Capital |
| 28 Jan 2025 | Series F | $425M | $5.4B | Lightspeed Venture Partners, SoftBank Vision Fund 2 |
| 5 Nov 2021 | Series E | $2.2B | - | - |
| 1 Jan 2021 | Seed | $500M | - | Sam Altman |
Tech stack
Detected on helionenergy.com, last scanned 22 Sept 2026. Run your own scan
- Analytics
- Google Analytics 4, LinkedIn Insight Tag
- CMS / Builders
- Webflow, Shopify
- CDN
- Cloudflare
- Email provider
- Microsoft 365
- Email marketing
- Mailchimp
- Video / media
- Vimeo
Frequently asked
What does Helion do?
They plan to use deuterium-helium-3 fuel in their future commercial reactors, with a goal of delivering electricity to Microsoft by 2028 from their larger Orion reactor.
How much funding has Helion raised?
Helion has raised a total of $3.6B in funding. The most recent round on record is Series G.
How many employees does Helion have?
Helion has approximately 521 people on record.
Hyperscale Cloud Providers
Microsoft has a stated goal to be carbon negative by 2030 and has already signed a power purchase agreement with Helion for 50 MW of clean electricity starting in 2028.
Industrial Manufacturing
Nucor, a large steel producer, has an agreement with Helion to develop a 500 MW fusion power plant in the 2030s, indicating a need for significant, clean energy for its manufacturing facilities.
Confirmed customer relationships for Helion. Speculative buyer-fit guesses are not shown.