The Grande Dixence Dam is a concrete gravity dam on the Dixence at the head of the Val d'Hérens in the canton of Valais in Switzerland. At high, it is the tallest gravity dam in the world and is part of the Cleuson-Dixence Complex. With the primary purpose of hydroelectric power generation, the dam fuels four power stations, totaling the installed capacity to , generating approximately annually, enough to power 400,000 Swiss households.