Patent ID: 7555660

Claim:
An electric-power management system comprising: at least one image forming apparatus, wherein the image forming apparatus has, as an operation mode, a normal power mode in which operation is performed at a normal power consumption and a power saving mode in which standby is performed at a power lower than the normal power consumption; a power detection unit that detects one of power consumption and integral power consumption of a building where the image forming apparatus is installed; and a power management server that reduces power consumption of the image forming apparatus in a case where a detection result of the power detection unit reaches a previously determined upper limit value, wherein the power management server includes: a judgment section that judges whether the detection result of the power detection unit is the upper limit value or more; and an instruction section that instructs the image forming apparatus to reduce the power in a case where the judgment result of the judgment section is the upper limit value or more; and the image forming apparatus includes: a first control section that changes the operation mode from the normal power mode to the power saving mode in a case where a time of the standby reaches a previously determined set time; and a second control section that changes the operation mode from the normal power mode to the power saving mode in a case where a reduction instruction is received from the instruction section.