Song Da No 11 JSC engages in the construction of hydroelectric projects, water supply and sewerage systems, post office, and urban and industrial parks. Its activities also include manufacture and trade of metal and mechanical products; transport of goods by land; importation and exportation of motor vehicles and spare parts; installation, test, calibration, maintenance, and assemble of industrial electrical panels; and maintenance of power plants and substations. The company was founded in 1961 and is headquartered in Ha Noi, Vietnam.