Embalse de Alcántara y central José María de Oriol Curiosity · Alcántara, Comarca de Alcántara, Cáceres Built between 1964 and 1969 on the Tagus, the reservoir (also called Alcántara II) was at the time the second largest in Europe. Its hydroelectric power station, named José María de Oriol, remains key to renewable energy production in Extremadura. 1964-1969 Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Alcántara