There really is only ONE 'alternative' energy source that makes sense - and it sure as hell isn't solar or wind. We have pretty well documented the problems with BOTH of those on this board over the years.
The ONE that does make sense, WORKS, is economic - and is absolutely IDEAL for Japan - unlike most other countries and that one is ... hyup, you guessed it, GEOTHERMAL.
Now, those that have followed me over the years know that I raked CALPINE ENERGY over the friggin' coals for their business practices and problems - declaring quite boldly that they would be going into Chapter 11 Bankruptcy at least a full year before that happened. Calpine stock was still a 'darling' of many at that time.
However, the ONE thing I never berated Calpine on was their GEOTHERMAL TECHNOLOGY, IMPLEMENTATION, and plant generation. If they had stuck to that - they would have been quite profitable, albeit never the 'huge' nyse company that they aspired to become.
THAT TECHNOLOGY is what Japan could use - IMMEDIATELY - to generate more than some insignificant portion of their energy needs - probably close to 80% within two years - if they decided to go that route.
Just my (educated) opinion.