The total power consumption of chillers with normal storage is 812.9 MWh per year more than that of chillers without storage, but power cost can save 839.6 thousand dollars per year, about 35.6%,as shown in Table 4. From the table, with thermal storage, peak load is just 22.2% of that of chillers without storage, but off-peak load increases 46.9%, then the main energy consumption increment is at the off-peak time.