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