Thermal Storage Systems are accomplished through sensible heat storage or as latent heat storage. Thermal storage systems are classified as full storage systems or partial storage systems. In full storage systems, the equivalent of the entire cooling or heating load energy for the design day is stored in the storage off-peak and used during the following peak period. In partial storage systems, only a portion of the daily load is generated during the preceding off-peak period and stored. These systems use electrical energy to cool some storage media at off-peak hours, and then use the cooling capacity of the media during on-peak hours. They also allow the chiller load to be shifted to times when electrical energy is inexpensive. Thermal storage systems remove heat from or add heat to a storage medium for use at another time.