The Saucelle Dam is a gravity dam on the Douro River. It is located about 4 km (2.5 mi) west of Saucelle in the province of Salamanca, Castile and León, Spain. The dam straddles the border of Spain and Portugal but is owned an operated by Spain's Iberdrola. Construction on the dam began in 1950 and was completed in 1956. The primary purpose of the dam is hydroelectric power production and it has an installed capacity of 520 MW.