From 2020 to 2021, Japan's GHG reduction targets were revised, and in 2030 it was decided to reduce by 46% from 2013, and to aim for a decarbonized society by 2050. In particular, the household sector is required to reduce GHG emissions by 66% in 2030, and to significantly reduce GHG in a relatively short period of time. In this study, GHG emissions by 2050 is estimated, assuming the factors that are said to be important for achieving this goal, that is, the promotion of energy conservation and electrification. As a result, even if the emission factor of electricity is significantly reduced as planned and electrification is promoted in various household applications, it is not easy to achieve the reduction target in 2030, and demand needs to be reduced by nearly 10% compared to the present.