The purpose of this research is to show the optimal energy demand-supply systems of whole Japan considered the cities characteristic and district generators. The city in Japan is classified into four areas according to a size of population. The characteristic is given to the four areas using statistical data. Energy source, photovoltaic (PV) possibility, etc. by the each areas were clarified. Furthermore, the grid power system and the energy systems of non-industrial sectors were modeled by linear programming. Total expense for energy supply-demand is minimized under carbon-dioxide-emission restrictions. It was shown that the target value of carbon-dioxide-emission reduces 18% by optimized calculation compared with 2010. In the target case, 18 GW of CHPs were introduced on the large population area, and 108 GW (heat output capacity) of EHPs were introduced in all four areas. Introduced CHPs supplied 30 to 50% for the peak demand of electric power in the installed areas. EHPs and CHPs were introduced in all assumed scenarios, and it contributed to load leveling of the grid power system.