Christiani & Nielsen Thailand Public Co. Ltd. engages in the provision of construction services. It offers design and construction of building and civil engineering projects, design, fabrication, and erection of steel structures, and mechanical and electrical installations, through its subsidiaries. It operates through the Main Operating and Sales and Service segments. The Main Operating segment consists of the construction services. The Sales and Services segment focuses on the energy solutions in solar, wind, and other renewable energy sectors. The company was founded on February 28, 1930 and is headquartered in Bangkok, Thailand.