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The Alcántara Dam, also known as the José María de Oriol Dam, is a
buttress dam A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses A buttress is an architectural structure built against or projecting from a wall which ...
on the
Tagus River The Tagus ( ; ; ) is the longest river in the Iberian Peninsula. The river rises in the Montes Universales between Cuenca and Teruel, in mid-eastern Spain, flows , generally westward, and empties into the Atlantic Ocean in Lisbon. Name T ...
near
Alcántara Alcántara () is a municipality in the province of Cáceres, Extremadura, Spain, on the Tagus, near Portugal. The toponym is from the Arabic word ''al-Qanṭarah'' (القنطرة) meaning "the bridge". History Archaeological findings have atte ...
in the
province of Cáceres The province of Cáceres (; ; ; ) is a province of western Spain, and makes up the northern half of the autonomous community of Extremadura. Its capital is the city of Cáceres. Other cities in the province include Plasencia, Coria, Navalm ...
,
Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
. It is named after the politician and captain of the Spanish electricity industry José María de Oriol y Urquijo. The dam regulates much of the flow of the Tagus River, the longest of the
Iberian Peninsula The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, comprisin ...
. It was built in 1969 and is the second largest reservoir in Western Europe. In 2024, a
pumped-storage Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing. A PSH system stores energy in the form of gravitational potent ...
project was approved to use the Alcántara reservoir as the upper reservoir, and Cedillo as the lower, with around 100 m height difference serving two reversible turbines at a combined 440 MW. The
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of Roman civilization *Epistle to the Romans, shortened to Romans, a letter w ...
Alcántara Bridge is located 600 m downstream from the dam.


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"Empresas ICA S.A.B. de C.V. (ICA)" - Reuters
{{DEFAULTSORT:Alcantara Dam Dams in Spain Hydroelectric power stations in Spain Buttress dams in Spain Dams completed in 1969 Dams on the Tagus Buildings and structures in the Province of Cáceres Energy in Extremadura