Solar PV roof case in Japan is a growing trend as the country seeks to reduce its reliance on nuclear power and increase its use of renewable energy sources. Solar PV roof systems are becoming increasingly popular in Japan due to their cost-effectiveness, low maintenance, and environmental benefits. The Japanese government has been providing subsidies for solar PV roof installations since 2009, which has helped to make them more affordable for homeowners. In addition, the government has also implemented policies that encourage businesses to install solar PV roofs on their buildings. This has led to an increase in the number of commercial solar PV roof installations in Japan. These systems are expected to continue growing in popularity as the country continues its shift towards renewable energy sources.