The Éguzon hydroelectric dam

The Eguzon Dam, located on the Creuse River, was one of the largest in Europe when it was built (1917 to 1926). Today, it produces electricity annually for 41 people, the equivalent of the city of Châteauroux.
After multiple projects, the first groundbreaking ceremony took place in 1917. A public limited company called "Union Hydroélectrique" was then created. Influential shareholders, including the Paris-Orléans Railway Company, wanted to find a means of production powerful enough to ensure the power supply of the railway network under construction between Vierzon and Toulouse. More than 1 workers worked day and night on the construction site. The Eguzon dam was finally inaugurated. the 5 June 1926.

A curvilinear gravity dam, with each level approximately 80% thick, thus resisting water pressure by its own weight. The dam consists of 10 masonry sections separated by 9 contraction joints with a copper sheet covering each separation from the neighboring block. 
For the materials, an American method will be used: Cyclopean Concrete made from slag concrete (water + cement) and large blocks of amphibolite, a very solid rock found at the very location of the dam.

61.1 m high with a drop of 58.4 m and a reservoir of 55 million m³ of water, a lake of 312 hectares and 17 km long.
The dam crest is 255 m long, 55 m thick at its base and 5 m at the crest.
The highest water level is 203 m above sea level.

Production :
The current is produced using six hydraulic power generation units (turbine + alternator) with a power of twelve megawatts each, equipped with Francis-type turbines supplied by the two penstocks.
A new turbine is under construction in 2019 to replace the valve used to maintain the flow of the river.
Equipped with a power of 70,6 MW15, the plant prevents the emission of 83 tonnes of carbon dioxide and therefore greenhouse gases each year.
Annual production is one hundred and five gigawatt-hours (one hundred and five million kilowatt-hours).
The energy produced is transported to the Éguzon electricity transformer station by two 90 V high-voltage lines.