ACEA S.p.A., together with its subsidiaries, operates as a multi-utility company in Italy. The company operates through Environment, Commercial and Trading, Water, Energy Infrastructure, Engineering and Services, and Overseas segments. The Environment segment primarily engages in the treatment of refuse and associated disposal. This segment also manages waste energy facility and composting plants in the Lazio region; and produces energy from waste. The Commercial and Trading segment sells and supplies electrical energy and natural gas. The Water segment provides drinking water distribution services comprising collection, discharge, retail, and wholesale. This segment supplies water to approximately 9 million customers; and manages integrated water service in Rome and Frosinone, as well as in other parts of Lazio, Tuscany, Umbria, and Campania. The Energy Infrastructure segment runs hydroelectric, photovoltaic, thermoelectric plants in Lazio, Umbria, and Abruzzo; manages public and artistic lighting; and distributes approximately 10 TWh of electricity. The Engineering and Services segment researches, designs, constructs, and manages integrated water systems; and offers analytical services on various environmental matrices. The Overseas segment manages the water activity in Latin America. ACEA S.p.A. was founded in 1909 and is based in Rome, Italy.