The volume of air storage required for a typical CAES
plant is most economically provided by geological structures. Impermeable
underground caverns have proven to be both technically and economically
feasible for storing gases and liquids for over 40 years.
Ridge Energy's initial CAES plant development will use salt cavern
storage. This type of underground storage for gases and liquids
is thoroughly understood and in common use. The Strategic Petroleum
Reserve is just one example of successful long-term storage in underground
These caverns are created by drilling a conventional
well to pump fresh water into a salt dome or bedded salt formation.
The salt dissolves until the water is saturated, and the resulting
salt water is returned to the surface. This process continues until
a cavern of the desired volume and shape is created.
Large-scale storage of compressed air is also possible in other geologic
formations, such as hard rock mines or aquifers. While Ridge is focusing
its initial CAES development efforts in salt domes, the company is also
acquiring sites in geographic areas where alternative formations exist.
Use of other storage types will expand the geographic
location of CAES plants throughout North America, to the United Kingdom,
Continental Europe, and the Middle East.
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