Brazil's water utility Companhia de Saneamento Básico do Estado de São Paulo S.A. (Sabesp) is responsible for water supply, and wastewater collection and treatment in 367 municipalities of the São Paulo state, serving 27.8 million users with drinking water and 21.3 million with sewerage services. The company operates in the residential, commercial, public and industrial segments, also providing wholesale water service for other five cities in the state. Additionally, through partnerships with other firms, Sabesp provides services for four municipalities —Mogi-Mirim, Castilho, Andradina and Mairinque. The company has 8.7 million water connections and 7.1 million sewerage connections. The firm also holds interests in power generation company Paulista Geradora de Energia S.A. Sabesp was established in 1973 as a result of the merger of the former companies operating in the sector. Half of Sabesp's shares are owned by the São Paulo government state, with the remainder publicly traded.