Until recently less than 1% of Japan's electrical power output came from renewables. But following the catastrophe of Fukushima and the power blackouts that followed, Japan has seen an explosion in investment in alternatives. Solar, in particular, in this averagely photon-blessed country, has seen a seismic rise of late and is this year poised to become the world's largest solar market in volume after China.

According to a report by energy analyst IHS on Japan's energy mix, Japan's solar installations jumped by "a stunning 270% (in gigawatts) in the first quarter of 2013." That means by the end of 2013 there will be enough new solar panels equal to the capacity of seven nuclear reactors. Such massive growth will allow Japan to surpass Germany and become the world's largest photovoltaics (PV) market in terms of revenue this year.

"Japan is forecast to install $20 billion worth of PV systems in 2013, up 82% from $11 billion in 2012," IHS said. "In contrast, the global market is set for tepid 4% growth. The strong revenue performance for Japan this year is partly driven by the high solar prices in the country." Germany still leads with the total number of units and capacity, however, with its 32,192 megawatts. Japan is now closer to the U.S.'s 8,069 megawatts at 7,429 megawatts, according to London-based BNEF.