The El Cajón Dam is a hydroelectric dam on the Río Grande de Santiago in the Mexican state of Nayarit. Construction began in 2003 and was completed in June 2007. It cost US$800 million to build. It is 640 m (2,100 ft) long and is 178 m (584 ft) high. The reservoir holds approximately 5,000,000,000 m³ (1.8×10¹¹ cu ft) of water, and the generators are capable of producing 750 MW of electricity. The dam is operated by the Comisión Federal de Electricidad, a state-owned Mexican electric company.