Thermal Energy Storage (TES) refers to technologies that store energy in a thermal reservoir for later use. Balancing energy demands between daytime and nighttime, TES systems use ice or chilled water from stored thermal energy to reduce peak air conditioning loads. TES can be used to significantly reduce energy costs by allowing energy-intensive, electrically driven cooling equipment to be predominantly operated during off-peak hours when electricity rates are lower. In addition, some system configurations result in lower first costs and/or lower operating costs compared to non-storage systems.
TES systems may earn credits in the Energy and Atmosphere section of the Leadership in Energy and Environmental Design (LEED) rating system. For example, ice storage has helped the Hewlett Foundation in Menlo Park, CA earn LEED Gold.
