Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Otsuki Takashi and Komiyama Ryoichi and Fujii Yasumasa,Study on Surplus Electricity under Massive Integration of Intermittent Renewable Energy Sources,IEEJ Transactions on Power and Energy,03854213,The Institute of Electrical Engineers of Japan,2015,135,5,299-309,https://cir.nii.ac.jp/crid/1390282679580040576,https://doi.org/10.1541/ieejpes.135.299