抄録
In GHG emission reduction plans in Japan, photovoltaic is promoted aggressively. However, government of Japan and local governments have no concrete promotion for solar water heater since the statistics of solar water heater such as number of installed houses and effective energy supply are not well maintained. The objective of this study is to investigate the installation of photovoltaic and solar water heater in a city of Sagamihara City in Kanagawa Prefecture in order to support the regional action plan for solar energy. For that purpose we conducted a field study by visual observation and obtained the following results. The installation ratios of photovoltaic and solar water heater vary depending on the regional characters in Sagamihara City. The ratios of photovoltaic tend to be high in the liver and town region and those of solar water heater are high in the rural region in the city. Despite of the current decrease of solar water heater, the rural region still use more solar energy including photovoltaic and solar water heater than the other regions. The numbers of installation of solar water heater vary substantially with references, but the number of Bureau of Statistics of Japan is close to that of this field study in Sagamihara City. Hence, the statistics of Bureau of Statistics could be basic data that local governments utilize in order to institute the regional action plans for the solar energy.
