The Saint-Clair-sur-Epte underground natural gas storage site is located at the border between the three departments of Oise, Val d'Oise and Eure, around eight kilometres northwest of Magny-en-Vexin. It partially lies within the boundary of the French Vexin Regional Nature Park created in 1994.
The Saint-Clair-sur-Epte facilities have been designed to minimise their environmental impact. The visual impact of the central stration's facilities has been minimised by keeping them within the Arnet Woods.
This storage site is equipped with high performance compression technology thereby eliminating all greenhouse gas emissions and significantly reducing noise pollution.
Saint-Clair-sur-Epte site plays an important role in supplying gas to the Normandy and the Greater Paris regions.
Type: aquifer storage
Type of gas stored: type H (high calorific)
Geological strata: upper jurassic
Reservoir depth: 702 and 743 metres
Number of operation wells: 20
Number of control wells: 18
Maximum storage volume: 1,700 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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