Yondenko 

Yondenko Corporation, headquartered in Takamatsu, Japan, specializes in the construction of diverse electrical and infrastructure projects throughout the country. Its core activities include building electrical facilities for commercial, public, and industrial properties, as well as installing air conditioning, water supply, drainage, and sanitary plumbing systems. The company also develops water treatment plants, telecommunications infrastructure, and solutions for disaster and crime prevention. In power infrastructure, Yondenko constructs both overhead and underground transmission and distribution lines, alongside general civil engineering projects and solar power generation facilities, as well as information and communication equipment. Beyond its construction services, the firm engages in Private Finance Initiative (PFI) and Public-Private Partnership (PPP) schemes, develops and sells CAD software for building systems, participates in solar energy ventures, and conducts utility pole advertising. Founded in 1948 as Shikoku Electric Construction Corporation, the company officially became Yondenko Corporation in November 1989.