A worker checks solar panels at a solar power field in Kawasaki, near Tokyo in this July 6, 2011 file photo. Japan's subsidies for renewable power suppliers have sparked more than $2 billion of investment since they were launched two months ago, as companies and homeowners try to profit from an anti-nuclear energy policy after 2011's Fukushima crisis. Picture taken July 6, 2011. To match story JAPAN-ENERGY/RENEWABLES REUTERS/Toru Hanai/Files (JAPAN - Tags: POLITICS BUSINESS ENERGY ENVIRONMENT)
