ENERGY MANAGEMENT SYSTEM, ENERGY MANAGEMENT METHOD AND HOST ENERGY MANAGEMENT DEVICE

A power management system comprises a plurality of HEMSs 40 and a CEMS 40. The CEMS 40 receives from each HEMS 10, power information including an amount of power consumed by a load connected to each HEMS 10. The CEMS 40 transmits, to each HEMS 10, reduction information including an amount of power that should be reduced in each consumer 70 in response to a power curtailment signal and the power information.