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Realta Fusion

Realta Fusion

🇺🇸 Madison, US · Founded 2022 · Active

Realta Fusion is a company in Madison, Wisconsin, developing magnetic mirror fusion, in which plasma is held in a straight chamber between two very strong superconducting magnets that reflect particles back and forth. Its designs build on the Wisconsin HTS Axisymmetric Mirror (WHAM), a University of Wisconsin experiment funded by ARPA-E, whose research Realta sponsors; WHAM produced its first plasma in 2024 in a 17 tesla magnetic field. Realta aims to supply compact, modular fusion systems for industrial heat and power, and its roadmap targets a fusion pilot plant by the mid-2030s. In May 2023 the Department of Energy selected it for the Milestone-Based Fusion Development Program, and in 2024 it closed a $36 million Series A with Future Ventures and Khosla Ventures.

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Sector
Fusion
Technology
Magnetic mirror
Fuel
Deuterium–tritium
Role
Fusion developer

Its recorded equity, $45m, is the 23rd 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 one award or agreement with no cash figure, which is not added to any total.

Terms

Magnetic mirror
Plasma trapped between two regions of strong magnetic field that reflect particles back. Simple and linear, but historically leaky at the ends.
Deuterium–tritium
Lowest ignition threshold; 80% of energy in 14.1 MeV neutrons. The reference fuel for every near-term net-gain claim.

Funding

$45m
equity in the 2 rounds recorded here
1
commitment with no cash figure
  1. 2025-05-13
    Equity round · Series A
    Series A of $36 million announced 13 May 2025, led by Future Ventures, with Khosla Ventures returning. SEC Form D reports $35,510,568 sold, first sale 1 May 2025.
    $36m
  2. 2023-05-31
    Equity round · Seed
    Seed round of $9 million led by Khosla Ventures, announced 31 May 2023. The same release headlines "$12 million in financing", which adds a $3 million DOE award to the seed; the award is a separate milestone-award record and is not part of this amount.
    $9m
  3. 2023-05
    Milestone-based award
    DOE Milestone-Based Fusion Development Program
    Unpriced

Related companies

Sources