Kyoto Fusioneering lands U.S. grants for fusion fuel breeding device at Oak Ridge

Fusion power's spotlight tends to fall on the reactors themselves, but Kyoto Fusioneering is making a case that the supply chain deserves attention too. The Japan-based startup, which supplies components for future fusion power plants, has won grants from the U.S. Department of Energy and the state of Tennessee to build a prototype fuel breeding device at Oak Ridge National Laboratory. The company told TechCrunch exclusively that it will also move its U.S. headquarters to Oak Ridge.

Kyoto Fusioneering has emerged as one of the larger specialists in the fusion supply chain, with $121 million in committed capital, according to FusionX. The new grants support work on a device called Unity-3, developed with ORNL, to test a fuel cycle technology known as a breeding blanket. Breeding blankets are designed to harvest energy from the fusion reactor while generating fresh fusion fuel. One design uses liquid lithium, which absorbs both heat and neutrons; as lithium atoms are bombarded with neutrons, they split into helium and tritium, an isotope of hydrogen that is an important fuel for many reactor designs. The tritium is then separated from the blanket and sent to the reactor, while the heat is extracted to generate power.

The work requires heat-resistant materials, bespoke pumps, and other specialized equipment. Unity-3 will test not just liquid lithium but a range of breeding blanket materials, the company said, helping researchers and startups validate data that so far has mostly come from computer models.

The project lands at a moment when fusion startups are increasingly looking outside their own walls. According to a recent Fusion Industry Association survey, over half of fusion startups said they plan to work with external suppliers like Kyoto Fusioneering on fuel cycle technologies. Several reactor developers — including Realta Fusion, Thea Energy, Type One Energy, and Xcimer Energy — will use data from the Unity-3 experiments to design their reactors. That range of customers and approaches should help position Kyoto Fusioneering as a go-to supplier when fusion power is ready for the grid.

Kyoto Fusioneering is also developing systems to heat fusion fuel into a plasma, recycle unburned fuel from exhaust, and harvest heat to generate electricity — a reminder that a fusion plant is far more than a reactor. With the Oak Ridge project, the company is betting that the less glamorous machinery around the reactor will be just as essential to making fusion commercial.