NOVELTY - A cogeneration system contains electric power-generating apparatus (101) which transforms renewable energy into electrical energy, electrolyzer (102) which manufactures hydrogen, hydrogenation apparatus (103) which adds the hydrogen gas with respect to aromatic compound and converts into hydride, dehydrogenation device (106) which dehydrogenates the hydride and separates into hydrogen and unsaturated hydrocarbon, thermoelectric feeder device which electric power-generates hydrogen and produces electric power and electric power supply line.    USE - Cogeneration system (claimed).    ADVANTAGE - The cogeneration system is environmentally-friendly, by suppressing discharge of carbon dioxide.    DETAILED DESCRIPTION - A cogeneration system comprises electric power-generating apparatus which transforms renewable energy into electrical energy, electrolyzer which manufactures hydrogen gas obtained by the electric power-generating apparatus using electrical energy, hydrogenation apparatus which adds the hydrogen gas manufactured by the electrolyzer with respect to aromatic compound, and converts into a hydride, hydride tank (105) which stores the hydride generated with the hydrogenation apparatus, dehydrogenation device (106) which dehydrogenates the hydride and separates into hydrogen and unsaturated hydrocarbon, thermoelectric feeder device which electric-power-generates hydrogen generated by the dehydrogenation device as a fuel, and produces electric power and heat, electric power supply line which supplies the electric power electric-power-generated by the thermoelectric feeder device to a demand place (110), exhaust heat supply line (116) which supplies the exhaust heat of the thermoelectric feeder device sequentially to dehydrogenation device, electrolyzer and demand place, combustor (108) which supplies heat when heat amount supplied from an exhaust heat supply line runs short with respect to the dehydrogenation device, the electrolyzer, and demand place and heat supply adjustment unit which adjusts heat amount supplied from the combustor with respect to each of the dehydrogenation device, the electrolyzer, and the demand place.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of structure of cogeneration system. (Drawing includes non-English language text)    Electric power-generating apparatus (101)    Electrolyzer (102)    Hydrogenation apparatus (103)    Hydride tank (105)    Dehydrogenation device (106)    Combustor (108)    Demand place (110)    Exhaust heat supply line (116)