Managing energy consumption of a building in an interconnected wide area management system

A wide area management system which manages power consumed in buildings, comprising:

• a wide area management device;
• and
• building management devices installed to correspond to the respective buildings,
• wherein the wide area management device includes:
• a first management table storage unit which stores a management table storing information of lower-level building management devices managed by each building management device as an upper-level representative management device for each building management device;
• and
• a transmission unit which specifies an uppermost-level building management device by referring to the management table stored in the first management table storage unit and transmits one control command instructing reduction of power consumption of each building for each specified building management device, and
• wherein each building management device includes:
• a second management table storage unit which stores the management table;
• an event program storage unit which stores an event program describing a content of control which is to be performed on each facility device in the building corresponding to the building management device in association with the control command in order to implement the control command;
• a reception unit which receives the control command from the wide area management device or the upper-level representative management device;
• a transfer unit which, in a case where the reception unit receives the control command, specifies lower-level building management devices managed by a self building management device as a representative management device by referring to the management table stored in the second management table storage unit and transfers the received control command to each of the specified lower-level building management devices;
• an event program extraction unit which, in a case where the reception unit receives the control command, extracts the event program corresponding to the control command from the event program storage unit an event program execution unit which executes the extracted event program to control the power consumption of each facility device in the building corresponding to the self building management devices;
• a power information storage unit which stores information of the power consumption of the buildings corresponding to the building management devices in association with the self building management device and the lower-level building management devices;
• a power information collection unit which collects the information of the power consumption of the building corresponding to the self building management device to store the information in the power information storage unit and collects the information of the power consumption of the buildings corresponding to the lower-level building management devices from the lower-level building management devices to store the information in the power information storage unit;
• and
• an additional command transmission unit which, after the transfer unit transfers the control command received by the reception unit to each of the lower-level building management devices and the event program execution unit of the self building management device executes the event program corresponding to the control command, calculates a sum of the power consumption of the building corresponding to the self building management device and the buildings corresponding to the lower-level building management devices by referring to the power information storage unit, in a case where the calculated sum of the power consumption is equal or larger than power consumption of which reduction is instructed by the control command, generates an additional command instructing new reduction of power consumption, and transmits the generated additional command to the event program extraction unit of the self building management device or to at least one of the lower-level building management devices.