- Hokkaido Electric Power Co., Inc.
- Tohoku Electric Power Co., Inc.
- Tokyo Electric Power Co., Inc.
- Chubu Electric Power Co., Inc.
- Hokuriku Electric Power Co., Inc.
- The Kansai Electric Power Co., Inc.
- The Chugoku Electric Power Co., Inc.
- Shikoku Electric Power Co., Inc.
- Kyushu Electric Power Co., Inc.
- The Okinawa Electric Power Co., Inc.