A distributed methanation system (1) according to the present invention includes: a methane generation system (10) that includes a co-electrolysis device (11) and a methane reactor (12), and generates methane by being supplied with power, water, and carbon dioxide; and a fuel cell power generation system (20) that includes a reformer (21) which converts the methane supplied from the methane generation system (10) into hydrogen and a fuel cell (22) which generates power using the hydrogen supplied from the reformer (21), in which the fuel cell power generation system (20) includes a circulation flow path which recirculates an off-gas of the hydrogen generated in the fuel cell (22) and a separator (24) which separates carbon dioxide from the off-gas of the hydrogen, and the distributed methanation system (1) further includes a carbon dioxide recovery device (40) which recovers the carbon dioxide separated by the separator (24).
