A 59,000-square-foot, four-story centralized water chilling facility with a concrete frame and an underground piping network to link office buildings and Minute Maid Park with the chilled water plant. The plant makes ice during the night when electricity is cheapest. As the ice melts during the day, it's pumped through the piping network to the buildings for use in the air conditioning systems. The plant production capacity is based on three basic types of equipment centrifugal chillers, helical screw chillers and thermal ice storage. The capacity of the district chilled water plant system is 17,000 tons of chilled water initially, expandable to 33,000 tons.