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Thea Energy

Thea Energy

🇺🇸 Kearny, US · Founded 2022 · Active

Thea Energy is a fusion company in Kearny, New Jersey, founded in 2022 with technology developed at Princeton University. It is designing a stellarator, a device that confines plasma in a twisted magnetic field, but replaces the complex three-dimensional coils of earlier stellarators with arrays of flat (planar) magnets whose currents are set by software to shape the field. Its first planned machine, Eos, is a neutron source meant to run below energy breakeven and produce tritium and medical isotopes, ahead of a power plant it calls Helios. In May 2023 it was one of eight companies selected for the US Department of Energy's Milestone-Based Fusion Development Program, and in September 2024 it raised $20 million in a Series A round led by Prelude Ventures.

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Sector
Fusion
Technology
Stellarator
Fuel
Deuterium–tritium
Role
Fusion developer

Its recorded equity, $120m, is the 19th largest of the 25 organisations with a priced round here. Not every round is on record, so this is not its total raised.

It also holds 2 awards or agreements with no cash figure, which are not added to any total.

Terms

Stellarator
Confinement produced by external coils twisted into complex three-dimensional shapes, so no net current has to be driven through the plasma. That removes the disruptions a tokamak's plasma current can cause and allows continuous operation, at the price of coils that are far harder to design and build.
Deuterium–tritium
Lowest ignition threshold; 80% of energy in 14.1 MeV neutrons. The reference fuel for every near-term net-gain claim.

Funding

$120m
equity in the 2 rounds recorded here
$20m
Grant
2
commitments with no cash figure
  1. 2026-08-18
    Equity round · Series B
    Extension of the Series B announced 18 August 2026, with Brevan Howard Macro Venture, Aloniq, ALJ Investments, Beyond Earth Ventures and unnamed strategic investors. The amount is not disclosed and is recorded as undisclosed, not as zero.
    Unpriced
  2. 2026-07-27
    Grant
    ARPA-E
    $20m
  3. 2026-05-27
    Equity round · Series B
    Series B of $100 million announced 27 May 2026, led by US Innovative Technology Fund (USIT). No named investor has an organisation record yet.
    $100m
  4. 2024-02-08
    Equity round · Series A
    Series A of $20 million, announced as closed on 8 February 2024, led by Prelude Ventures.
    $20m
  5. 2023-05
    Milestone-based award
    DOE Milestone-Based Fusion Development Program
    Unpriced

Related companies

Sources