To meet the long-term goal of the Paris Agreement for mitigating climate change,many countries including Japan have adopted the ‘green growth’ strategy to decarbonize their economies. While the transition from conventional growth to green growth is seen as a desirable paradigm shift, green growth is now criticized for its insufficient plausibility of decoupling emissions from GDP and expected negative consequences on social equality. As an alternative paradigm, ‘degrowth’ has been proposed. Degrowth has some commonality with ‘Green New Deal’, but it calls for a more radical transformation of the socio-economic system. Though a desirable next paradigm is uncertain, at least we need to look squarely at downsides of green growth and seriously seek to overcome them or to find a new way forward.

In recent years, renewable energy has been attracting attention around the world. Among renewable energy sources, solar power generation is recognized as one of the electric power sources that can be used for the self-consumption of the energy demand in each consumer scale as well as installing mega-solar power equipment in a wide scale. In this study, by using Light Detection And Ranging (LiDAR) and building polygon data sets, the introduction potential and the annual estimated power generation amount of rooftop solar power panels were calculated in 3 scenarios, considering the slope aspect and angle of a roof and the influence of shadows by surrounding buildings. In addition, the estimation results were compared with other estimation methods and already equipped panels. The outcome of this study could be used for the improvement of the introduction rate of solar power panels as an index for the formation of an environment-friendly society in the future.