Problem to be solved: to provide a system capable of energy storage and stable and efficient power generation.Water splitting apparatus for decomposing water into hydrogen and oxygenA metation apparatus that generates methane gas by reacting hydrogen and carbon dioxideA methane gas supply means for supplying methane gas synthesized in said metaboading apparatus to a gas accumulation and supply meansA fuel cell system operating with a city gas supplied from said gas storage and supply meansA hydrogen supply means for supplying hydrogen generated by the water decomposing apparatus to the metaboading apparatusCarbon dioxide generated when the fuel cell system operates with said city gasCarbon dioxide supply means to be supplied to the metamorphic deviceBased on the amount of said hydrogen supplied to said metamorphic deviceA control device for controlling the amount of carbon dioxide required for the amount of methane to be synthesized in the metamorphic apparatusProviding.Diagram
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