Kyoto Fusioneering wins gyrotron contract for Infinity One
The contract covers 170 GHz, 1 MW-class plasma-heating systems for Type One Energy’s engineering prototype. Manufacturing and testing will take place in Japan, with all deliveries scheduled for completion in 2029.
Read the Japanese originalAnnouncement date：2026-11-05
Kyoto Fusioneering (KF) announced on November 5, 2026 that it had secured a contract to supply gyrotron systems for Infinity One, Type One Energy’s stellarator engineering prototype. The systems will generate 170 GHz, 1 MW-class microwaves for plasma heating. All deliveries are scheduled to be completed in 2029.
KF will handle design, manufacturing, factory acceptance testing and transport, and supervise installation and site acceptance testing in the United States. The systems will be built and tested at its Shiga Innovation Factory in Japan. Neither company disclosed the contract value or the number of systems.
Gyrotrons generate high-power microwaves. Infinity One will use these microwaves to heat electrons in the plasma through electron cyclotron heating (ECH). The 1 MW-class rating refers to the microwave output used for heating.
Infinity One is an engineering prototype being developed at the Tennessee Valley Authority’s (TVA) Bull Run site in East Tennessee. According to Type One Energy, it is intended to test the performance of key stellarator systems and components ahead of Infinity Two, the company’s planned commercial fusion power plant.
The announcement concerns procurement of heating equipment for the prototype. Manufacturing, testing, transport, installation and site acceptance testing remain ahead.
Related explainer: Gyrotrons and radio-frequency plasma heating
- Kyoto Fusioneering: Gyrotron order for Type One Energy’s Infinity One prototype (November 5, 2026)
- Type One Energy: Kyoto Fusioneering to Provide Gyrotrons for Type One Energy’s Infinity One Stellarator (November 5, 2026)
Information checked as of：2026-11-06
Official announcements by KF and Type One Energy were checked on November 6, 2026. The announcement date, specifications, responsibilities, manufacturing and testing site, and scheduled completion of deliveries in 2029 were cross-checked. The releases are not independent performance verification and do not establish completed delivery, operation or electricity generation. Contract value and system count were not disclosed.