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Explore rivers and the systems around themFocused datasets and analytical stories

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Satellite reservoir status

Reservoir map loading

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Map layersWorldwide physical waterways · loading river pages

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Country view

River or basin

Pumped-storage hydro · grid battery

Grand'Maison

operatingFrance · lower reservoir on the Eau d'Olle

Turbine capacity: 1,800 MW
Energy storage: 34.8 GWh
Gross head: -
First unit: 1985

Europe's largest pumped-storage plant; twelve sets split between a surface and an underground powerhouse on the Eau d'Olle

Nameplate figures and coordinates: Wikipedia · 45.2028, 6.1167

Map layersexpand

seasonal below area no shared status