Slight problem?
You overlooked the fact that solar wouldn't even come close to providing enough power for Japan. Japan lacks in two essential areas that make solar even remotely feasible which is large tracts of unused land, and areas mostly sunny throughout the whole year. Sure you could install them on every commercial building, government building, and home within Japan and that may get them to scrape by, but then you're talking a drastic increase in installation cost to the point it's not possible or would bankrupt the nation.
Yes a tech that is often overlooked by the government and educational systems needs funding from somewhere. Solar companies even working with tried and true technology with government funding fail.
