Home Our projects Storage projects Current projects


Current projects

To guarantee a quality service which meets the needs of the market, Teréga has been working for a number of years to modernise and develop the Lussagnet and Izaute storage installations. About our current projects.

The underground storage facilities at Lussagnet (Landes – 40) and Izaute (Gers – 32) help supply natural gas to the transport and distribution grids in the far southwest, as well as part of Spain and the rest of France.

In 2015, these two structures accounted for roughly 24% of French Storage Capacity.

Teréga is working to modernise, develop and enhance safety at its storage installations so that it can continue to offer high-quality, safe services to meet the needs of the market. At the same time it is building in the latest technology to reduce the impact on the environment.

Current projects

Teréga is investing in the improvement and development of its storage infrastructure.

Developing storage capacities at Lussagnet

One of the ongoing projects is progressively to increase the total storage volume at Lussagnet from 2.4 GNm³ to 3.5 GNm³, in accordance with permission granted in a ministerial decree dated 9 April 2008.

This increase, once implemented, will enable us to offer new storage capacities to the market and continue the work to increase Storage Capacity which began in 2004.

Development of tradable storage capacities since 2008 (increase of more than 20%)

Development of tradable storage capacities since 2008 (increase of more than 20%)

Improved modelling of the dynamic behaviour of underground storage

Teréga constantly refines and modernises its dynamic “reservoir” model, which allows simulation of how the storage behaves.

There have been recent technical developments in: 

  • geological studies;
  • structural studies (geophysics);
  • petrophysical measurements taken in the laboratory using rock samples.

These have enabled us to fine-tune the settings for our 3-dimensional digital model, which simulates gas and water Movement through the pores in the rock.  
Since it extends over the whole region, the work has helped us study and monitor the aquifer’s behaviour, and the way it interacts with storage.

This model helps optimise the use of storage so that we can respond more effectively to needs in the market.

In 2013, Teréga undertook a project to make geophysical measurements using reflective seismology, focussed on its two underground storage facilities. After being processed and interpreted, the data recorded using this technology will be used to perfect the three-dimensional underground mapping.


Partial view of the 3-dimensional dynamic model used to simulate the behaviour of the storage at Lussagnet and Izaute.

Enhancing safety at installations

To pursue our policy of continuous improvement in safety at our installations, Teréga carried out a number of projects:

  • a campaign to plug old small-diameter wells for good is under way at Lussagnet in order to reduce the number of active injection/draw-off wells and retaining only the highest-performing ones fitted with the latest technology to guarantee the highest level of safety;
  • continued enhancement and improvement of the “overburden” rock monitoring facility at storage sites, to ensure its integrity;
  • completion of a new network of cold vents (flameless) and torches at the Lussagnet site. If there is an incident, they enable automatic emergency depressurisation at the Lussagnet centre;
  • preparation and introduction of a technological risk prevention plan (PPRT) in accordance with French regulations.

Enhancing environmental protection

Teréga is renewing its commitment to the environment by introducing a number of recent projects:

  • improving the rainwater management and drainage system at the Lussagnet centre ;
  • improving the water treatment plant at the Lussagnet centre ;
  • continuous reduction of greenhouse gas emissions at Lussagnet. Steps taken include: the replacement of two compressors currently driven by gas motors by electrically driven compressors;
  • a research programme, undertaken in partnership with the University of Pau, on the physicochemical interactions between the stored gas and the aquifer.

Modernising installations and enhancing reliability

To modernise its installations and make them more reliable, Teréga has embarked on a series of actions:

  • modernisation of the TEG regeneration system at the Lussagnet centre, which is used in dehydration of the gas ;
  • complete renovation of the instrument air and nitrogen production and distribution system at the Lussagnet centre ;
  • replacement of the old compressors at the Lussagnet centre, to improve site safety and the reliability of compression equipment. The work will also lead to a reduction in greenhouse gas emissions.

Map of installations

Map of installations

List of Teréga territories operating in the 15 departments of the South West

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

ENERGY IS OUR FUTURE, LET'S NOT WASTE IT!Copyright ©2018 TEREGA. SitemapGlossaryLegal noticeCredits