Patent ID: 8744640

Claim:
A green power demand management device comprising: a power meter configured to receive power from a power distribution system which generates power with a plurality of power generating units, and to supply a received power to a first appliance; a receiver configured to receive, from the power distribution system, energy mixture information showing a power generation proportion among each power generating unit; a measuring unit configured to measure electric energy consumed by the first appliance; a setting unit configured to set a first threshold which represents an upper limit of an amount of an environmental load material; a power usage history database configured to store the electric energy measured by the measuring unit; a change pattern database configured to store a plurality of change patterns each specifying an amount of change in an operational parameter of the first appliance; a power consumption variation database configured to store a variation of electric energy consumed per unit time by the first appliance when each change pattern is applied to the first appliance, respectively; an operating state control manager configured to use an intensity conversion table including emission intensities each representing an amount of an environmental load material emitted by each power generating unit at generating of unit electric energy, obtain a second threshold by dividing the first threshold by sum total of the emission intensity of each power generating unit weighted by the power generation proportion, and apply, to the first appliance, a change pattern selected from the first database so that electric energy consumption of the first appliance is equal to or smaller than the second threshold; an operation information acquiring unit configured to acquire operation information showing that the operational parameter of the first appliance has been changed by a user; and a forced shift frequency database configured to store forced shift frequencies of each change pattern, the forced shift frequencies being frequencies at which the operational parameter has been forcibly changed by the user after each change pattern was applied to the first appliance, wherein the operating state control manager selects the change pattern based on the forced shift frequencies of each change pattern.