| PT Kedap Sayaaq | 10.00 | - | - | |
| 한국수력원자력(주) | 100 | | - | |
| Korea Midland Power Co Ltd | 100.00 | - | - | |
| РЕС Технолъджи АД | 50.00000000 | | - | |
| Korea South-East Power Co Ltd | 100 | | - | |
| Nghi Son 2 Power | 50.00 | - | - | |
| Qatrana Electric Power Company | 80.00 | - | - | |
| MANGILAO INTERMEDIATE HOLDINGS LLC | - | | - | |
| Korea Gas Corp | 20.47 | - | - | |
| Korea Southern Power | 100.00 | - | - | |
| RE PATTERSON HOLDINGS LLC | - | | - | |
| KEPCO Bylong Australia | 100.00 | - | - | |
| Seokmun Energy | 29.00 | - | - | |
| Korea South-East Power Co Ltd | 100.00 | - | - | |
| Korea District Heating | 19.55 | - | - | |
| Korea Western Power Co Ltd | 100.00 | - | - | |
| KEPCO Philippines | 100.00 | - | - | |
| RE PATTERSON HOLDINGS LLC | - | | - | |
| Naepo Green Energy | 29.20 | - | - | |
| Korea Midland Power Co Ltd | 100 | | - | |
| RE BARREN RIDGE 2 HOLDINGS LLC | - | | - | |
| EWP (Barbados) 1 | 100.00 | - | - | |
| Korea East-West Power Co Ltd | 100.00 | - | - | |
| Pioneer Gas Power | 38.50 | - | - | |
| 한전케이디엔(주) | 100 | | - | |
| Korea Southern Power | 100 | | - | |
| 한국서부발전주식회사 | 100 | | - | |
| RE PIONEER HOLDINGS LLC | - | | - | |
| KST Electric Power Company | 56.00 | - | - | |
| Korea East-West Power Co Ltd | 100 | | - | |
| KOSPO USA | 100.00 | - | - | |
| Amman Asia Electric Power Company | 60.00 | - | - | |