This paper describes development of district co-generation including heat source equipment and heat spply pump, and the effect analysis by the diffusion of district co-generation system in Japanese business area. 1. Developed model calculated district co-generation system operation at 5-minute interval. And the effect analysis used three energy indexes; annual primary energy consumption, annual life cycle CO2emissions, and annual standard deviation of power supply and demand. 2. The estimating of district co-generation system spread effect confirmed the energy saving effect, CO2saving effect, and power system operation stability improvement effect by district co-generation in Japanese business area.
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