From the aspect of the future technology in the household sector, it is expected that there will be a shift from a vertically divided energy system to a cross-sectoral one such as integration with the transportation sector, which was traditionally independent, widespread use of photovoltaic (PV) cells due to their falling prices and demand change in the power grid, the introduction potential of net Zero Energy House / net Zero Energy Building (ZEH/ZEB), which realizes significant energy savings in commercial buildings, and the introduction of electric vehicles (EV). As an extension of this, there is also a concept to restructure an energy system that integrates the entire city block, such as a compact city.
　In order to deal with these issues in an integrated manner, this report explicitly deals with changes in the household structure due to population decrease and increase in single-person households in each municipality nationwide and makes future forecasts of (1) shift from single-family housing to multi-family housing and (2) demand for new residential housing. Based on the FY2017 and FY2018 annual survey of household CO₂ emissions by the Ministry of the Environment, energy consumption and CO₂ emissions by usage/housing type by the municipality, changes in CO₂ emissions when technologies such as EV, heat pump, and heat insulation are introduced into housing, and changes in demand for building materials due to changes in demand for new residential housing construction are predicted and evaluated. By this means, the effectiveness of the introduction of technology options in the household sector can be evaluated by region and housing type, and the priority of technology introduction policies can be derived.