To strongly urge technological development and practical application of a flywheel power storage device that is dominant in long service lifetime, high efficiency, and inexpensiveness by clarifying determination-evaluation criteria of load leveling operation effects by power storage devices of a power supply system from standpoints of energy-saving effects and CO2emission control effects in the current state that countermeasures against global warming are considered as global and mankind's issues.

It is considered that the criteria proposing the following embodiment is an accurate and dominant means to solve the problems of countermeasures against global warming that surpasses a kill-two-birds-with-one-stone solution. The embodiment achieves service expansion of a flywheel power storage device to power consumer ends ranging over a civil section, a transportation section, and an industrial section. The flywheel power storage device has a possibility of increasing a ratio of non-fossil fuel power generation such as nuclear power generation in a power supply system at a faster pace than before in an economic and technological society in which an electrification ratio is increased year by year.

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