With the significant access of new energy, the imbalance on the power generation side is exacerbated, and the daily peak valley difference and seasonal peak valley difference on the user side are still increasing. The role of grid side energy storage is more prominent. Grid side energy storage is an effective adjustment tool for auxiliary services. The addition of grid side energy storage system can promote the process of power marketization and spot power trading. ● Power frequency modulation and peak shaving ● Independent participation in ancillary services ● Secondary frequency modulation, paid peak shaving, AVC, rotating standby, cold standby, black start