In Japan, a Feed-in Tariff (FIT) scheme (the Act on Special Measures Concerning the Procurement of Renewable Energy by Electricity Utilities) was introduced in June 2012 to promote use of electricity from renewable energy sources (RES). The FIT is a major scheme for promoting RES electricity, which has been introduced in European countries including Germany, Spain, and the UK. Following these experiences, RES electricity has been smoothly increasing in Japan, particularly photovoltaics (PV). After the scheme was enforced, 2.4 GW of residential PV and 8.5 GW of non-residential PV have been newly introduced, which occupies 98% of the total newly introduced RES electricity (11.1 GW, as of June 2014). It is due to higher tariff for PV facilities (JPY 37/kWh for residential and JPY 32/kWh for non-residential in 2014) and its shorter lead time compared to other RES facilities. Because its power generation is fluctuated by weather conditions, connecting a large amount of PV to the power grid can cause a problem to balance supply and demand of electricity. In the FIT scheme, there are terms that the electricity companies can refuse to purchase and connect RES electricity under certain conditions. Priority connection of RES electricity is ensured in Europe, while it is not in Japan.