In and after April 2013, when a new tariff of ¥36 per watt became effective, the number of certified facilities leveled off. But it began to grow again recently. Though the gap between the number of operating facilities and that of certified facilities is large, the total capacity of operating facilities steadily increased by 300,000-600,000kW per month in 2013.
By region, the total capacity of operating non-residential systems is the largest in Fukuoka Prefecture (293,132kW), followed by Kagoshima Prefecture (236,223kW), Aichi Prefecture (229,441kW), Hyogo Prefecture (222,410kW) and Ibaraki Prefecture (222,252kW). Also, the total capacity of 1MW or larger operating solar power plants is the largest in Fukuoka Prefecture (127,076kW), followed by Kagoshima Prefecture (117,259kW), Hyogo Prefecture (70,221kW), Ibaraki Prefecture (65,235kW) and Hokkaido (62,973kW).