Kyoto Fusioneering
Japanese fusion-plant engineering company developing plasma heating, fuel-cycle and thermal systems for international customers and demonstration programs.
Read the Japanese original 日本語Company and international footprint
Kyoto Fusioneering Ltd. is a Japanese engineering company established on 1 October 2019. Its official profile lists a Tokyo head office and a Kyoto research center, together with group companies in the United Kingdom, United States and Germany. This international footprint is relevant to overseas organizations seeking a Japanese engineering partner: the company works across research, equipment development and manufacturing management. Its published quality-management certification covers development and manufacturing management of fusion products. Kyoto Fusioneering: company profile
Technology and industrial role
The company develops and integrates plasma-heating systems, fusion fuel-cycle equipment, and blanket and thermal-cycle systems. Its heating offer includes gyrotrons and the supporting magnets, power supplies, transmission, cooling and controls. These are systems that a fusion developer must connect to its wider plant. The company describes an approach that brings Japanese manufacturers into fusion supply chains rather than manufacturing every component internally. Kyoto Fusioneering: technologies
What its demonstrations establish
The UNITY program tests engineering systems needed by future plants. UNITY-1, listed as operational in Kyoto, uses electrical and induction heating to reproduce relevant heat conditions without producing fusion reactions. UNITY-2 is being developed at Canadian Nuclear Laboratories through Fusion Fuel Cycles, the partners’ joint venture, to test an integrated fuel cycle. These facilities address different engineering questions; their progress should not be described as an operating commercial fusion power station. Kyoto Fusioneering: UNITY program
Deliveries and subsequent development
The Japanese profile distinguishes delivered heating equipment from systems still undergoing integrated development. The company’s 2025 review reports deliveries to DIII-D in the United States and Tokamak Energy in the United Kingdom. Japan’s wider ITER gyrotron manufacturing record should not be treated as Kyoto Fusioneering’s own delivery record. 2025 delivery review
An August 2026 update reported that most UNITY-1 construction was complete, with hydrogen-isotope extraction tests under way and further integrated tests planned from autumn. UNITY-3, developed with Oak Ridge National Laboratory, is intended for blanket neutron-irradiation testing. In October 2026 the company also announced vanadium-alloy work with Daido Steel and a General Atomics project to design and supply divertor tiles for DIII-D’s negative-triangularity configuration. These are development activities, not demonstrated commercial-reactor durability. UNITY development update Materials development DIII-D divertor project
At a glance
- Country
- Japan
- Location
- Tokyo headquarters; Kyoto research center
- Established
- 2019
- Role
- Fusion engineering and systems supplier
- Fuel
- Not confirmed in the source directory
- Development stage
- Commercial engineering services and technology demonstration
Sources & verification
- Kyoto Fusioneering: company profile
- Kyoto Fusioneering: technology areas
- Kyoto Fusioneering: 2025 business and equipment-delivery review
- Kyoto Fusioneering: UNITY program
- Kyoto Fusioneering: UNITY-1 progress
- Kyoto Fusioneering: UNITY-1, UNITY-2 and UNITY-3 development update
- Kyoto Fusioneering: joint divertor development for DIII-D
- Kyoto Fusioneering and Daido Steel: vanadium alloy development
Information verified: 2026-10-08
Primary-source editorial profile. Reported milestones, work in development and future objectives are distinguished.