Gas can be stored in salt domes under suitable geological conditions - it can then be released at a later date as required. These caverns embedded in rock strata must be absolutely impermeable to gases and liquids; they must be highly stable and durable; and be inexpensive and easy to build. The homogeneity and plasticity of salt found in salt domes makes them especially suited for sto- ring gas reserves. The natural gas is pumped underground

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