Recently, cutting the CO2 emissions has been the worldwide problem. In order to reduce the CO2 emissions, it is important to promote the energy conservation and introduce the sustainable natural energy. In this paper, we have been studied to develop a combination energy system of the energy conservation and the natural energy in the Okayama Prefectural University. We have a result that it is possible to cut off the 36% or more CO2 emission with the combination of (1) replacing the air-conditioner from the absorption type to a heat pump type, (2) introducing photovoltaic power generation and (3) changing the car that is used for commute from the internal-combustion engine type to an electric vehicle (EV). In addition to cut the CO2 emission, the studied combination energy system can be presented the high economically method.

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