Compression of air creates heat; the air is warmer after compression. Expansion removes heat. If no extra heat is added, the air will be much colder after expansion. If the heat generated during compression can be stored and used during expansion, then the efficiency of the storage improves considerably. There are several ways in which a CAES system can deal with heat. Air storage can be , diabatic, , or near-isothermal.
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Ravenswood was originally built and owned by of New York Inc. (Con Edison) in 1963. The first two units constructed in 1963 were Ravenswood 10 and 20, each having a generating capacity of approximately 385 . Then, in 1965, Ravenswood 30 (commonly called "") was commissioned with a generating capacity of nearly 981 megawatts. A new 1,000 MW unit was originally planned to be located on the north side of the
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