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ABSTRACT
The state of the art of energy storage systems used by the electric utilities for peak shaving is discussed. The underlying concepts for the operation of the most important available schemes have been described. Whenever applicable the economics of the energy storage schemes as well as the cost expressed in §/Kw of electric capacity have been provided. In addition, the procedure used in modeling an energy storage system for planning purposes has been explained. The paper concludes with a prediction of the trend expected in future expansions of electric power plants.