The 21st century's most advanced skyscraper takes a lesson from the past to slash its energy bills. Victorian-era ice houses cut blocks of frozen water from lakes to store and use during the hot summer months. BoA Tower will make ice at night, when power prices are lower, and use it during the day to chill the A/C system. In one of the tower's sub-basements there are 44 squat cylindrical ice tanks—10 feet tall and 10 feet across. These promise to help cut—by 50%—the amount of power the building needs to cool itself during the hottest days, when electricity demand is greatest.
Made by CALMAC Manufacturing, the system takes a big bite out of pollution, too. On hot summer afternoons, when power demand spikes, utilities typically fire up their least efficient and most pollution-spewing generators. During these peak periods, 90% of smog-forming particulates are emitted by just 50% of power plants. Since the building won't need to draw on this dirty power, the building's ice tanks will help to cut out a disproportionate share of pollution. Depending on summertime heat, ice storage systems can pay for themselves in three to five years.