"Propelled partly by the increased interest in renewable energy following the Fukushima disaster, the Renewable Energy Act passed the Diet in August 2011 and was enacted in July 2012. It requires electric utility operators to purchase all the renewable electricity generated from most of the renewable energy sources (solar, onshore and offshore wind, geothermal, biomass, and hydro smaller than 30 MW)."
(Source: http://www.wri.org/sites/default/files/wri_workingpaper_japan_final_ck_6_11_14.pdf)
A new FiT scheme has been approved in 2016 with the goal to achieve a more balanced distribution between the different types of renewable sources (solar leading at the moment). "The program of changes will take effect on April 1, 2017, and includes a reverse auction system that will replace the FIT system for large-scale photovoltaic (PV) solar projects." (http://www.whitecase.com/publications/alert/changes-japans-existing-renewable-energy-feed-tariff-system)
The FiT subsidies for solar PV systems for fiscal year 2016 are as following:
-24 Yen for capacity >10kWh
-33 Yen for capacity