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    Helion Energy

    Also known as Helion

    Helion Energy is a fusion company that magnetically compresses pulsed field-reversed configuration (FRC) plasmas. It aims to recover electricity directly, without a steam turbine.[1] It signed the first fusion power purchase agreement, with Microsoft, in 2023, and says it is building its Orion plant in Malaga, Washington, for initial operations in 2028. In February 2026 it reported measurable deuterium-tritium fusion on its Polaris prototype, a result not yet independently verified.[2][3][4]

    Editor reviewedUpdated Fusion energyEnergy and climatePhysics
    Key facts

    Approach

    Helion does not build a tokamak. Its machines magnetically compress high-beta field-reversed configuration (FRC) plasmas in pulses. Helion aims to recover the fusion energy directly as electricity, rather than first converting it to heat for a steam turbine.[1] Because the machine is pulsed, Helion says it does not rely on the plasma sustaining itself through ignition.[5] Its long-term commercial fuel is deuterium and helium-3. Helion plans to produce the helium-3 in its own machines.[6]

    Helion’s fuel choice differs from most of the field. Most machines plan to burn deuterium and tritium, which emits 14 MeV neutrons and requires tritium breeding.[7][8][9] Helion plans a closed-loop cycle that makes helium-3 in its own machines through deuterium-deuterium reactions and tritium decay.[6]

    Polaris

    Polaris is Helion’s prototype; Helion says it is designed to demonstrate electricity production from fusion.[10] On 13 February 2026 Helion said Polaris was the first privately developed fusion machine to demonstrate measurable deuterium-tritium fusion and had reached plasma temperatures of 150 million degrees Celsius. Helion also said it was the first company approved to possess and use tritium for demonstrating fusion energy.[4] These are company-reported results that have not yet been independently verified.[4]

    Orion and Microsoft

    On 10 May 2023 Helion signed what it called the world’s first fusion power purchase agreement, to supply Microsoft from its first plant. The plant was expected online by 2028 and targets at least 50 megawatts after a one-year ramp-up.[2] Constellation is the power marketer.[2] In July 2025 Helion began earthwork and construction at the site, named Orion, in Malaga, Washington.[11] Helion says Orion is designed to deliver at least 50 megawatts and begin initial operations in 2028.[3]

    On 16 June 2026 Helion said Washington’s Department of Health had granted it a radioactive materials licence and a radioactive air emissions licence. Helion said this made it the first company to hold the regulatory licences needed for a fusion power plant.[12] Helion said the site’s assembly and office building was complete by then.[12]

    Funding

    On 4 June 2026 Helion announced a $465 million Series G led by Thrive Capital at a $15.5 billion post-money valuation, which it said brought total investment in the company to $1.5 billion; it later added that the round closed at $500 million in September 2026.[13] The Fusion Industry Association lists the June round among the industry’s largest, in a year when 56 fusion companies reported raising $4.48 billion.[14][15] All of Helion’s valuation and funding figures here are company statements.

    External research programme

    Helion also funds outside research. On 7 April 2026 it awarded $4 million under its HERCULES programme to 25 proposals across 20 institutions in the United States and United Kingdom, and said more than $17 million was committed through 2028, for work on materials, magnet systems and diagnostics.[16]

    What to watch

    Helion’s 2028 date is far earlier than iter‘s 2039 start of deuterium-tritium operation and CFS’s early-2030s target for ARC; commonwealth-fusion-systems targets its Q>1 physics milestone in 2027.[3][17][18][19] The next milestone to watch is whether Polaris shows electricity production, as Helion says it was designed to do.[10]

    How far such company reports can be checked is the central problem for readers. Helion’s D-T result rests on its own announcement.[4] By contrast, General Fusion’s October 2026 1 keV electron-temperature result on LM26 was measured with the UK Atomic Energy Authority and described in a paper co-authored with it and submitted for peer review.[20][21] This page marks Helion’s own results as reported until an outside party confirms them. The wider argument about company timelines is set out in the fusion timeline debate.

    Questions readers ask

    How is Helion's approach different from a tokamak?

    Helion compresses pulsed, high-beta field-reversed configuration plasmas with magnetic fields and aims to recover energy directly as electricity, without heat and a steam turbine.[1]

    When will Helion deliver power to Microsoft?

    Helion's 2023 agreement said the plant was expected online by 2028, targeting at least 50 MW after a one-year ramp-up. Helion says Orion is designed to begin initial operations in 2028.[2][3]

    Has Helion produced fusion?

    Helion said in February 2026 that its Polaris prototype was the first privately developed machine to demonstrate measurable deuterium-tritium fusion, reaching 150 million degrees Celsius. This is the company's own report and has not yet been independently verified.[4]

    What fuel will Helion use?

    Its long-term commercial fuel is deuterium and helium-3, with helium-3 produced in its own machines.[6]

    How much has Helion raised, and at what valuation?

    Helion announced a $465 million Series G on 4 June 2026, led by Thrive Capital at a $15.5 billion post-money valuation, bringing total investment to $1.5 billion. It later said the round closed at $500 million in September 2026. These are company figures.[13]

    Sources

    Each numbered claim is a statement we checked against the sources listed with it. Status shows how well established it is.

    1. [1]

      Helion's machines magnetically compress pulsed, high-beta field-reversed configuration (FRC) plasmas and aim to recover energy directly as electricity rather than via heat and a steam turbine. confirmedas of 2026-10-10

    2. [2]

      On 10 May 2023 Helion signed the first fusion power purchase agreement, to supply Microsoft from a plant expected online by 2028 and targeting at least 50 megawatts after a one-year ramp-up, with Constellation as power marketer. confirmedas of 2026-10-10

    3. [3]

      Helion's first commercial plant, Orion, in Chelan County (Malaga), Washington, is designed to deliver at least 50 megawatts and begin initial operations in 2028. confirmedas of 2026-10-10

      • Orion · Helion Energy (retrieved 2026-10-10)
    4. [4]

      On 13 February 2026 Helion said its Polaris prototype was the first privately developed fusion machine to demonstrate measurable deuterium-tritium fusion and had reached plasma temperatures of 150 million degrees Celsius; Helion also said it was the first company approved to possess and use tritium to demonstrate fusion energy production. reportedas of 2026-02-13

    5. [5]

      Helion says its pulsed operation means its system does not rely on the plasma sustaining itself through ignition. confirmedas of 2026-10-10

    6. [6]

      Helion's long-term commercial fuel is deuterium and helium-3, with helium-3 to be produced in its own machines through a closed-loop fuel cycle based on deuterium-deuterium reactions and tritium decay. confirmedas of 2026-10-10

    7. [7]

      The most efficient fusion reaction in the laboratory is between the hydrogen isotopes deuterium and tritium, which produces helium and one neutron. confirmedas of 2026-10-10

    8. [8]

      A key materials challenge is building components that can withstand the 14 MeV neutrons from deuterium-tritium fusion, energies that fission-reactor experiments cannot easily mimic. confirmedas of 2026-10-10

    9. [9]

      Tritium for future plants is to be bred when neutrons escaping the plasma react with lithium in a blanket lining the reactor wall. confirmedas of 2026-10-10

      • Fuelling · ITER Organization (retrieved 2026-10-10)
    10. [10]

      Helion says Polaris is designed to demonstrate electricity production from fusion. confirmedas of 2026-10-10

    11. [11]

      In July 2025 Helion began earthwork and construction at the Orion site in Malaga, Washington. confirmedas of 2026-10-10

    12. [12]

      On 16 June 2026 Helion said the Washington State Department of Health had granted it radioactive materials and radioactive air emissions licences, making it the first company to hold the regulatory licences needed for a fusion power plant; by then Orion's assembly and office building was complete. reportedas of 2026-06-16

    13. [13]

      Helion announced a $465 million Series G on 4 June 2026 led by Thrive Capital at a $15.5 billion post-money valuation, bringing total investment in the company to $1.5 billion, and later said it closed the round at $500 million in September 2026. reportedas of 2026-09-30

    14. [14]

      Large recent rounds include CFS's $863 million Series B2 (August 2025), Proxima Fusion's $518 million (July 2026), Helion's $465 million (June 2026) and Inertia Enterprises' $450 million Series A (February 2026). confirmedas of 2026-07-13

    15. [15]

      In the 12 months to July 2026, 56 fusion companies raised $4.48 billion, bringing total private fusion funding reported since 2021 to $14.24 billion. confirmedas of 2026-07-13

    16. [16]

      On 7 April 2026 Helion awarded $4 million under its HERCULES external research programme to 25 proposals across 20 institutions in the United States and United Kingdom, with more than $17 million committed through 2028. reportedas of 2026-04-07

    17. [17]

      ITER's 2024 baseline schedules the Start of Research Operation in 2034, deuterium-deuterium operation in 2035, full magnetic energy in 2036 and the start of deuterium-tritium operation in 2039, about four years later than the 2016 plan. confirmedas of 2026-10-10

    18. [18]

      In December 2024 CFS chose the James River Industrial Center in Chesterfield County, Virginia, for ARC, a planned power plant of about 400 megawatts expected to deliver power to the grid in the early 2030s. confirmedas of 2026-10-10

    19. [19]

      As of October 2026 Commonwealth Fusion Systems publicly targets 2027 for SPARC to produce more energy from fusion than is needed to power the process, the Q>1 threshold. reportedas of 2026-10-10· forecast

    20. [20]

      On 8 October 2026 General Fusion said its LM26 magnetized target fusion machine had reached electron temperatures above 12 million degrees Celsius (more than 1 keV) by compressing plasma with a metal wall over milliseconds. reportedas of 2026-10-08

    21. [21]

      General Fusion's October 2026 Thomson scattering measurement on LM26 was made in collaboration with the UK Atomic Energy Authority, and is described in a joint statement and a paper co-authored with UKAEA that was submitted for peer review. reportedas of 2026-10-08

    Revision history (2)
    1. Page created.
    2. Refresh: added the Series G round and valuation, the HERCULES research programme, and comparisons with CFS's 2027 Q>1 target and General Fusion's UKAEA-measured result.

    Created Oct 10, 2026. Last reviewed by an editor on Oct 10, 2026. Next scheduled review: Jan 10, 2027.

    Cite this page

    "Helion Energy." ContentLora, updated Oct 10, 2026. https://contentlora.com/wiki/helion-energy

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