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Storage monitoring

Teréga's natural gas storage at Lussagnet and Izaute is located roughly 500 m below ground, in an aquifer (water-impregnated porous rock stratum), known as a "reservoir", overlaid by impermeable rock strata, known as the "overburden".

Teréga continuously monitors the effects of its underground gas storage operations

In particular, the company monitors:

  • the pressure in the reservoir (in the area occupied by the gas) and the overlying strata:
  • the pressure in the aquifer (around the area where the gas is present);
  • the water and gas quality.

Full understanding of the implications of these readings is gained from monitoring, assessment (particularly in partnership with the geological and mining research bureau, BRGM), modelling and research (in particular with the University of Pau and the Pays de l’Adour, UPPA).

Storage monitoring

Storage authorisation is issued by official decree following a public inquiry. The main local and public authorities, associations and other organisations are invited to contribute their views regarding the application. Consultations also take place involving the CSHP (High Committee for Public Health) in France, the General Council for Industry, Energy and Technology, and the Council of State. The Ministry of the Economy, Finance and Industry and the Ministry of Ecology, Sustainable Development, Transport and Housing are also involved in the authorisation process.

Operation of Teréga’s storage facilities is subject to ongoing inspection by the DREAL (Regional Directorate of the Environment, Development and Housing), the Prefectures and national-level monitoring by: 

  • the CSS (Storage Monitoring Committee, which has had national-level responsibility since 1989 for the scientific and environmental monitoring of the Izaute and Lussagnet storage facilities);
  • The General Council for Industry, Energy and Technology (CGIET);
  • the High Council for Public Health.

EN Standard TEREGA : 0 559 133 400EN Urgence Gaz : 0 800 028 800

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