Tamagawa Holdings Co., Ltd. operates in the electronic and communication equipment business as well as renewable energy. It offers high-frequency electronic components such as attenuators, splitters, couplers, switches, and filters, along with optical and electronic application equipment including optical transmission equipment, frequency converters, amplifiers, frequency synthesizers, digital signal processing devices, video and monitoring systems, and various test devices. The company also develops, manufactures, and sells millimeter-wave products, and is involved in the sale of power plants, the sale of electricity generated by small wind farms and other renewable energy power plants, and the sale of owned power plants. Founded in 1968, it is headquartered in Tokyo, Japan.