A power management device configured to manage power consumption in a building of a power customer, the power management device comprising: a power-consumption-information acquisition unit configured to acquire power consumption information indicating the power consumption in the building; a storage unit having stored therein history information including at least the power consumption information acquired by the power-consumption-information acquisition unit, and time information indicating a time frame in which power according to the power consumption information has been consumed in the building, the power consumption information and the time information being associated with each other in the history information; a request reception unit configured to receive a request based on power supply and demand; a determination unit configured to, when the request reception unit has received the request, determine ease or difficulty in management of the power consumption according to the request, on the basis of the history information stored in the storage unit, and power-management-required time frame information indicating a time frame for which power management according to the request is required; a notification unit configured to notify the power customer of a determination result by the determination unit, the notified determination result comprising information regarding the determined ease or difficulty in management of the power consumption according to the request; a reception unit configured to receive acceptance or rejection of the request from the power customer; and a response transmission unit configured to transmit, to a request source, response information corresponding to a content received by the reception unit. a power-consumption-information acquisition unit configured to acquire power consumption information indicating the power consumption in the building; a storage unit having stored therein history information including at least the power consumption information acquired by the power-consumption-information acquisition unit, and time information indicating a time frame in which power according to the power consumption information has been consumed in the building, the power consumption information and the time information being associated with each other in the history information; a request reception unit configured to receive a request based on power supply and demand; a determination unit configured to, when the request reception unit has received the request, determine ease or difficulty in management of the power consumption according to the request, on the basis of the history information stored in the storage unit, and power-management-required time frame information indicating a time frame for which power management according to the request is required; a notification unit configured to notify the power customer of a determination result by the determination unit, the notified determination result comprising information regarding the determined ease or difficulty in management of the power consumption according to the request; a reception unit configured to receive acceptance or rejection of the request from the power customer; and a response transmission unit configured to transmit, to a request source, response information corresponding to a content received by the reception unit.