The Los Angeles Department of Water and Power (LADWP) keeps the movie cameras running and the swimming pools full. The largest municipally owned utility in the US, LADWP provides electricity to more than 1.4 million residential and business customers and water to 640,000 customers. The company has power plant interests that give it more than 7,220 MW of generating capacity; it also buys and sells wholesale power. Most of the city's water supply is transported through two aqueduct systems from the Sierra Nevada Mountains; other water sources include wells and local groundwater basins. Because LADWP is city-owned, its retail monopoly status was unaffected by utility deregulation in California.