Impregilo SPA engages in the provision of engineering, architectural and construction services. The company operates through four business segments: Corporate, Construction, Engineering and Plant Construction, and Concessions. The Corporate segment manages and organizes the activities of the company's subsidiaries. The Construction segment refers to the infrastructure projects of the company such as dams, hydroelectric plants, motorways, railways, underground railways, underground works and bridges. The Engineering and Plant Construction segment provides services, such as desalination of sea water, fume treatment, and waste-to-energy conversion. The Concession segment coordinates the company's subsidiaries located abroad, and maintains the motorway networks, plants, water systems and non-medical hospital services. Impregilo was founded in 1906 and is headquartered in Milan, Italy.