Type One Energy
Founded in 2019, this US company develops HTS stellarators as an OEM for utilities. Infinity One engineering validation and the Infinity Two power-plant concept address distinct stages, with heat exhaust and fuel-cycle integration still central challenges.
Official company website ↗Read the Japanese originalCompany profile
- Official name
- Type One Energy
- English name
- Type One Energy
- Location
- United States Knoxville
- Year established
- 2019
- Industry
- Fusion startup
- Technology field
- Stellarators・High-temperature superconducting magnets・Heat exhaust and fuel cycle
- Type of involvement
- Research and development・Technology supply・Joint research
Role in the fusion industry
Stellarator development combining HTS coils and magnetic optimization. Component and facility validation plans are distinct from future commercial electricity generation.
Key products and technologies
- Infinity One (planned engineering-validation facility)
- Infinity Two (power-plant concept)
Disclosed involvement and track record
On 21 January 2026, ORNL announced a high-heat-flux test-facility project with Type One Energy and the University of Tennessee. The concept uses electron-beam heating and pressurized-helium cooling; completion by late 2027 was a target at announcement, not evidence of operating facilities or long-lived commercial components.
ORNL high-heat-flux test facility plan ↗Related projects
A relationship with a specific project has not been verified.
- About(Verified 2026-10-30）
- OEM strategy(Verified 2026-10-30）
- 2026 Series B financing(Verified 2026-10-30）
- Stellarator technology(Verified 2026-10-30）
- Infinity Two baseline plasma-physics design(Verified 2026-10-30）
- ORNL high-heat-flux test facility plan(Verified 2026-10-30）
- Infinity Two power and particle exhaust(Verified 2026-10-30）
- Fuel-cycle development concept(Verified 2026-10-30）
Last verified: 2026/10/30 11:44:00 (Japan time)
A technology supplier rooted in research-machine experience
Founded in 2019, Type One Energy is a US company now headquartered in Knoxville, Tennessee. It draws on experience developing and operating stellarators including the University of Wisconsin’s HSX, with the aim of turning the approach into commercial equipment.[1]
Its role is a technology supplier and original equipment manufacturer, not an independent electricity producer. The strategy divides responsibilities with utilities and engineering companies, combining fusion technology with industrial construction and operating capabilities.[2] On October 6, 2026, it announced a $200 million Series B financing. Fundraising supports development; it does not demonstrate power-generation performance.[3]
External coils create a complex magnetic field
A stellarator uses external coils to generate three-dimensional magnetic fields that confine hot plasma. Type One combines non-planar high-temperature superconducting coils with computational shape optimization. “High-temperature” compares superconducting materials; it does not mean the magnets operate at room temperature.[4]
A 2025 baseline-design paper analyzes Infinity Two as a quasi-isodynamic configuration. The objective is to improve particle orbits and transport while retaining fusion-produced alpha-particle energy in the plasma. An 800 MW D–T fusion output and Q=40 are modeled operating points, not measurements from an operating machine.[5]
Infinity One and Infinity Two are different machines
Infinity One is an engineering-verification and workforce-training facility planned at TVA’s Bull Run Energy Complex. The company’s current description targets commissioning in 2029. Infinity Two is a future electricity-generating plant concept, currently described by the company as 400 MWe.[4] Operation of a verification facility and completion of a commercial plant are separate milestones.
When 800 MW and 400 MWe appear together, the former denotes fusion-reaction output and the latter an electrical target. Their units and system boundaries differ; the pair does not establish a demonstrated whole-plant efficiency. Plans change, so historical figures should not be mixed uncritically into the current design.
A development campus linking TVA, ORNL and a university
The company identifies collaboration with TVA and AECOM, but a list of partners alone does not explain who designs, builds or operates particular equipment. Supply, research and construction responsibilities need to be distinguished.[2][4]
On January 21, 2026, ORNL announced a planned high-heat-flux testing facility at Bull Run with Type One and the University of Tennessee. Electron beams would expose plasma-facing components to severe heat loads, with pressurized-helium cooling also tested. Completion at the end of 2027 was the announcement’s schedule, not an operating achievement.[6] The important point is that wall and cooling tests require facilities beyond the plasma-producing machine itself.
Magnets do not solve exhaust and fuel challenges
Improved confinement alone cannot sustain operation without removing excess heat and particles. An exhaust-design paper examines an island divertor and structures intended to reduce the return of neutral particles to the plasma. This is design analysis, not a demonstration of long-lived commercial components.[7]
D–T systems also require consideration of tritium production in lithium-bearing blankets, heat recovery and shielding. The company is exploring a possible mix of plants emphasizing fuel breeding and others emphasizing electricity production; this does not represent a completed fuel-supply network.[8]
FI will assess not only coil manufacturing accuracy but cooling, power supplies, vacuum, space and procedures for component replacement, material lifetime, fuel recovery and whole-plant power balance. Distinguishing papers, contracts, construction, initial operation and sustained electricity delivery makes progress more intelligible than a promised generating year alone. Published plant renderings must not be treated as photographs of real equipment, and image-use permissions require separate verification.