The world has high hopes for a safe and clean power source. Kyocera provides a high-purity fine ceramic ring (alumina) with a large, 1.56-m diameter for the International Thermonuclear Experimental Reactor involved in the development of the energy of the future. The creation of large insulator manufacturing technology required to insulate 1 million volts has been a major issue. Kyocera and Naka Fusion Institute of the National Institutes for Quantum and Radiological Science and Technology undertook joint research and succeeded in the development of a large-scale fine ceramic ring shaping method. In addition to promoting next-generation energy sources, there are also high expectations for the ripple effects of this technology in the semiconductor industry and academic fields, such as particle physics.