Its features …
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Serre-Ponçon in a few figures
- Start of the construction works: 1955
- Start impoundment of the reservoir: 16 November 1959
- End of the works: 1961 commissioning of the groups: between 1960 and 1961
- Average annual production: 720 GWh
The Lake
- Lake surface : 2,800 acres to level 780 (similar to Lake Annecy )
- Length: 19 km
- Capacity of the lake: 1,27 billion m³ ( largest artificial dam in Europe land )
- Reserve for agriculture : 200 million m³ (mobilisable between the 1st of July and the 30th of September)
The dam
It is a dam in alluvium with central impervious core
- Height above the coat : 123 m
- Width of the dam in crest : 600 m
- Thickness of the dam at the base : 650 m
- Volume of the Dam: 14 million m³ (6 times the volume of the Great Pyramid of Cheops ), including 2 million for the impervious core.
The factory
- The access gallery to the factory is 100 m long and 40 m² in section
- Power: 360 MW (4 turbines Francis of 84 MW ) • Average production: 720 million kilowatt / hours
- Maximum Drop Height : 123 m
- Flow of 300 m³ / second