Patent ID: 8468375

Claim:
A storage system comprising: a storage device including a plurality of storage units; and a management device that manages operations of the storage device, wherein the management device: acquires a predetermined period for monitoring electric energy to be consumed by the plurality of storage units, and a total electric energy consumption upper limit value for the plurality of storage units during the predetermined period, acquires a past operational state and an electric power consumption under the past operational state of the plurality of storage units, estimates, according to the acquired past operational state and the electric power consumption under the past operational state, an electric energy to be consumed by the plurality of the storage units during the predetermined period, if the estimated electric energy exceeds the total electric energy consumption upper limit value, creates control information for controlling the one or more storage units included in the storage device to perform in a low power consumption state for a certain term of the predetermined period, so that the estimated electric energy would not exceed the total electric energy consumption upper limit value, and controls, according to the control information, an electric power state of the plurality of storage units.