1. Agency for Natural Resources and Energy. 2011. Denki ryōkin seidō no keii to genjō ni tsuite [Background and current situation of electric power rates]. Accessed February 25, 2019. http://www.meti.go.jp/committee/kenkyukai/energy/denkiryoukin/001_06_00.pdf.
2. Agency for Natural Resources and Energy. 2012. Denki ryōkin seidō unyō no minaoshi ni kakaru yūshokusha kaigi hōkokusho [Report of the expert committee on revising the electricity rate system]. Accessed February 24, 2019. http://www.meti.go.jp/committee/kenkyukai/energy/denkiryoukin/report_001_02a.pdf.
3. Agency for Natural Resources and Energy. 2013. Denryoku kouri shijō no jiyūka ni tsuite [On the liberalization of the small-scale retail power market]. Accessed March 17, 2018. http://www.enecho.meti.go.jp/category/electricity_and_gas/electric/pdf/seido1206.pdf.
4. Agency for Natural Resources and Energy. 2015. Denryoku no kouri zenmen jiyūka no gaiyō [Overview of the full liberalization of the small-scale retail power market]. Accessed March 17, 2018. http://www.enecho.meti.go.jp/category/electricity_and_gas/electric/electricity_liberalization/pdf/summary.pdf.
5. Agency for Natural Resources and Energy. 2016. FY2015 annual report on energy (Energy White Paper). Accessed February 25, 2019. https://www.meti.go.jp/english/press/2016/pdf/0517_01.pdf