Alcántara Dam

{{Infobox dam

| name = Alcántara Dam

| name_official =

| image = Presa de Alcántara.jpg

| image_size =

| image_caption =

| image_alt =

| location_map = Spain

| location_map_size =

| location_map_caption =

| coordinates = {{coord|39|43|48|N|6|53|05|W|type:landmark|display=inline,title}}

| country =

| location = Alcántara, province of Cáceres, Extremadura, Spain

| status = O

| construction_began =

| opening = 1969

| demolished =

| cost =

| owner =

| dam_type = Buttress

| dam_height = {{Convert|130|m|ft|0|abbr=on}}

| dam_height_thalweg =

| dam_height_foundation=

| dam_length = {{Convert|570|m|ft|0|abbr=on}}

| dam_width_crest =

| dam_width_base =

| dam_volume = {{Convert|956000|m3|cuyd|0|abbr=on}}

| dam_elevation_crest =

| dam_crosses =

| spillway_count = 2

| spillway_type =

| spillway_capacity = {{Convert|8000|m3/s|ft3/s|0|abbr=on}}

| res_name =

| res_capacity_total = {{Convert|3160000000|m3|acre.ft|0|abbr=on}}

| res_capacity_active =

| res_capacity_inactive=

| res_catchment = {{Convert|51916|km2|sqmi|0|abbr=on}}{{cite web|title=Jose Maria de Oriol (Alcantara II)|url=http://www.seprem.es/ficha.php?idpresa=579&p=23|publisher=Spanish Society of Reservoirs and Dams|accessdate=31 August 2011|language=Spanish}}

| res_surface =

| res_elevation =

| res_max_depth =

| res_max_length =

| res_max_width =

| res_tidal_range =

| plant_operator =

| plant_commission = 1969-1970

| plant_decommission =

| plant_type =

| plant_turbines = 4 x 229 MW Francis-type

| plant_capacity = 915 MW{{cite web|title=The hydroelectric Jose Maria de Oriol, one of the greatest in Spain|url=http://multimediaprofesionales.iberdrola.es/Noticias/CENTRAL,HIDROELECTRICA,JOSE,MARIA,ORIOL,GRANDES,ESPANA,429.html |publisher=Iberdrola|accessdate=31 August 2011|language=Spanish}}

| plant_annual_gen =

| website =

| extra =

}}

The Alcántara Dam, also known as the José María de Oriol Dam, is a buttress dam on the Tagus River near Alcántara in the province of Cáceres, Spain. 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. It was built in 1969 and is the second largest reservoir in Western Europe.{{cite web|url=https://docs.google.com/viewer?a=v&q=cache:Rca7OijaD80J:www.sum.uio.no/pdf/news/STRIVER-artikkel.pdf+%22Alcantara+Dam%22+Spain+news&hl=en&gl=us&pid=bl&srcid=ADGEESjxvVqzmsNtdhRmPG204sj17RUPoslBNPRje6nOOsyfKYXnKCrhU64KlccL_DCTHsqHrygL4oA7tJ7nAMCXOiGGyAm6-NgII03iwaLZFvWnxD6w7lYeJcZ4suNzk0yhxmhUSYAS&sig=AHIEtbSVIHrDbaGHdYS0HQfb7O1Lk3oDxA |title=Integrated Water Resources Management: STRIVER efforts to assess the current status and future possibilities in four river basins |date= |accessdate=2014-02-04}}{{cite web|url=https://docs.google.com/viewer?a=v&q=cache:TVEne7TGLEQJ:kvina.niva.no/striver/LinkClick.aspx%3Ffileticket%3DFqvGOhNm9QY%253D%26tabid%3D69%26mid%3D504+%22Alcantara+Dam%22+Spain+news&hl=en&gl=us&pid=bl&srcid=ADGEESg45wHYjXHsy86IQf1_TWsvZp3B8gbNDW44sVSYKCL7okQWf9QklPVs-58PW9dB-_WXtiaQpDo0M8of2m38CTsIDYQwehY1Of8uSXxf7Q6O5VSyb8c6dyXlHZRuKFrrOj6o3mmc&sig=AHIEtbQpV6rcIDcKkCMvm1RxKvl5KIkpkg |title="Bulletin" - Striver |date= |accessdate=2014-02-04}} In 2024, a pumped-storage 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.{{cite web |last1=Heynes |first1=George |title=Major pumped hydro energy storage project agreements in India, Spain |url=https://www.energy-storage.news/major-pumped-hydro-energy-storage-project-agreements-in-india-spain/ |website=Energy-Storage.News |date=27 September 2024}}

The Roman Alcántara Bridge is located 600 m downstream from the dam.