Hydroelectric facilities are on the Contador River on São Tomé. About 59% of São Tomé's 17 million kWh of electric power in 2000 were produced by hydroelectricity; the rest was thermal. Only about 10% of São Tomé's abundant hydroelectric potential has been harnessed. Total installed capacity in the islands was 10,000 kW in 2001. Most of São Tomé is electrified, but only a quarter of the nation's households have electricity.