The Kyoto Protocol is an international agreement at the Third Conference of Parties (COP3) which is to reduce the emission of greenhouse gases by a total of 5.2 percent between 2008 and 2012 from 1990 levels. Japan has a target reducing the emission over 2008 - 2012 by 6.0 percent from 1990 level under the protocol. The energy consumption in Japanese households sector is remarkably increasing as compared to industrial and transport sectors. In particular, the household energy consumption in Hokkaido is conspicuously larger than that in other prefectures. We proposed that the regional energy in Hokkaido had need of the housing solar energy generation and the promotion of the cogeneration systems using the fuel cell or the micro gas turbine was available in order to reduce the emission of CO2.