Yondenko Corporation engages in the electrical, and electrical power transmission and distribution facilities construction activities in Japan. It is involved in the construction of building, public, and factory electrical facilities; air conditioning systems; water supply, drainage, and sanitary plumbing systems; water treatment systems; facilities and equipment for telecommunications; and disaster and crime prevention facilities. The company also constructs overhead power transmission and distribution facilities; underground power transmission and distribution facilities; civil engineering projects; and solar power generation facilities, as well as provides Information and communications installation and construction services. In addition, it is involved in the development and sale of CAD software; solar power business; and utility pole advertising activities. The company was formerly known as Shikoku Electric Construction Corporation and changed its name to Yondenko Corporation in November 1989. Yondenko Corporation was incorporated in 1948 and is headquartered in Takamatsu, Japan.