POWER MANAGEMENT SYSTEM

A power management system for managing at least one power generation system connected to an electrical grid and at least one energy storage device connected to the electrical grid, wherein the energy storage device is charged or discharged in a time period in which the reliability of the prediction of the amount of power generation and the power demand per time period is high based on a predicted amount of power generation which is an amount of power generation of the power generation system predicted for each time period and a predicted power demand which is a power demand for the electrical grid. Thus, more proper energy management can be performed.