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Site overview

The Etrez site is located north of Bourg-en-Bresse in the Ain department. It is the largest underground natural gas salt cavern storage site in France and the fifth largest in Europe in terms of capacity.

The Etrez site has undergone a continuous development with the creation of new caverns and surface facilities. At the same time, the older facilities have been renovated to improve their operational and environmental performance. Particular attention was paid to integrating the facilities in the landscape to limit their visual impact for local residents and walkers.

 

Technical characteristics:
type: storage in salt caverns
Commissioning: 1980
Type of gas stored: type H (high calorific)
Geological strata: upper eocene
Depth of the salt layer: 1,250 to 1,900 metres
Number of cavities in operation: 19
Maximum storage volume: 1,117 million m³ at STP*

*m³ at STP = cubic metres at standard temperature and pressure: quantity of natural gas which at 0°C and under atmospheric pressure occupies a volume of one cubic metre.

 

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Fête de la Nature

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The structure of a salt cavern site

storage in salt caverns

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