This is from 2010:
http://www.energyboom.com/solar/japan-solar-power-installations-go-through-roof-2009That was fueled by incentives, but Japanese were relatively enthusiastic about solar power before the Fukushima Daiichi.
Companies were developing custom solutions for Japanese households long before the 3/11 tragedy:
http://sharp-world.com/corporate/news/090303.htmlThey've tried a lot of things - this was expensive, but interesting (also from 2009):
http://www.upiasia.com/Economics/2009/11/26/japan_experiments_with_fuel-cell_home_generator/8163/From 2008 - this has been a longstanding project of multiple governments:
http://www.japanfs.org/en/mailmagazine/newsletter/pages/027851.htmlAnd then there's always IKAROS, which admittedly has nothing to do with power at earth, but is just the coolest thing ever:
http://www.jaxa.jp/projects/sat/ikaros/index_e.htmlHowever, coming back to earth, the major problem the Japanese have with renewables is that their electric grid has to be massively redone. By the time they double currently installed solar and wind capacity, their grid will be coming close to the end of its capacity to accept the power and it is one reason why investors are dallying:
http://www.reuters.com/article/2011/08/22/us-japan-renewables-idUSTRE77L1AR20110822They approved the feed-in tariffs, but the next segment has to be the transmission grid, and that isn't even being addressed to date.
http://theenergycollective.com/jimpierobon/65202/japan-joins-germany-italy-china-ontario-new-feed-tariffs-30-gigawatts-renewables-5