Thermal energy storage (TES) reduces electric costs by shifting chilling activities to off-peak times. Water is chilled or ice is made during the night to either replace or augment operation of cooling equipment during the day. Off-peak demand and consumption rates produce significant dollar savings. TES requires fa- vorable electric rate structures, available space to house the associated equipment, and either variation in buildings cooling loads or favorable climatic conditions. THES can be implemented anywhere cooling loads can be shifted to off-peak hours, with the best applications being office build- ings, hospitals, and schools.
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