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1. A calculation apparatus for optimizing energy use efficiency of a grid that is interconnected to a power system and includes an energy storage apparatus, wherein a range of a final charge state in a prediction target section of the energy storage apparatus is determined based on a supply and demand prediction of power in a next section or later, and whether the final charge state of the section is matched with the range is evaluated by the optimization calculation of the prediction target section, wherein a surplus power amount in a first period, in which supply of the power exceeds demand in the next section or later, is calculated based on the supply and demand prediction of the power in the next section or later, and wherein the calculation apparatus generates and initiates a command that automatically causes a bidirectional inverter circuit to perform switching between a forward conversion operation and a reverse conversion operation within the first period and based upon the surplus power amount exceeding the demand in the next section or later.
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