But a fusion reactor can’t run for long without a lot of other equipment, and building a fusion reactor is expensive enough on its own. Among the dozens of companies in the emerging fusion power supply chain, few specialists are bigger than Kyoto Fusioneering. The startup has emerged as a key player in the fusion power industry. Other fusion startups, including Realta Fusion, Thea Energy, Type One Energy, and Xcimer Energy, will use data from the Unity-3 experiments to design their reactors. It’s a range of startups — and approaches to fusion power — that should help position Kyoto Fusioneering as a go-to supplier when fusion power is ready for the grid.