Most of the power consumed in a building is due to the air conditioning system. The thermal energy storage systems works on the principal chilling/cooling a conducting medium during off-peak hours and discharging the same during the peak use hours, thereby avoiding running the chillers during peak hours, when the consumption is otherwise at its maximum. This has added benefits with dual tariff when electrical power is cheaper at night. We have used this system successfully in several projects like Tidel Park, TCS (Siruseri), Chennai Trade Center (Chennai) and Ebene Cyber city, Mauritius.