MANAGEMENT SERVER AND MANAGEMENT METHOD

A CEMS server manages an amount of demanded electric power of consumer facilities organized into groups. The groups include at least two consumer facilities of which amounts of demanded electric power are correlated with each other. One of the at least two consumer facilities includes an HEMS server that transmits an amount of demanded electric power of the corresponding consumer facility to the CEMS server every first period. The CEMS server stores relationship information indicating a relationship between the amounts of demanded electric power of the at least two consumer facilities. The CEMS server calculates a total amount of demanded electric power of the groups based on the amount of demanded electric power transmitted from the HEMS server and the relationship information and outputs a DR request to the consumer facilities such that the total amount of demanded electric power matches a planned amount of electric power.