There are many rivers in Japan. Until now, large-scale hydroelectric power generation facilities have been built with large capital, but if the necessary conditions are met and there are people who want to try small-scale hydropower generation even on small rivers, there is a possibility that even if it is not a large company or government, it is possible and can be pursued. The establishment of the feed-in tariff system (FIT system) has made it possible for local people to own their own power plants.