What is injection?

Our underground storage sites at Lussagnet and Izaute are made up of a porous and permeable geological layer known as “reservoir” rock.

During periods of low consumption, in the summer, gas from the transport grid is injected into the “reservoir” rock, where it accumulates through the effect of gravity, displacing the water contained in pores in the rock. To do that, the gas pressure is increased using compression units located on the surface, so that the gas pressure becomes higher than the water pressure. The stored gas can then be drawn off in the winter.

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