| NII System | Capacity of thermal stations (MW) | Capacity of RES stations (MW) | NII System | Capacity of thermal stations (MW) | Capacity of RES stations (MW) |
| Agios Efstratios | 0.84 | 0.02 | Lesvos | 94.88 | 22.79 |
| Agathonissi | 0.64 | 0.00 | Lemnos | 23.60 | 4.93 |
| Amorgos | 6.20 | 0.29 | Megisti | 1.73 | 0.00 |
| Anafi | 1.15 | 0.00 | Milos | 22.98 | 3.27 |
| Antikyhtira | 0.41 | 0.00 | Mykonos | 67.49 | 2.24 |
| Arkioi | 0.41 | 0.00 | Othoni | 0.66 | 0.66 |
| Astypalea | 3.83 | 0.32 | Paros | 93.72 | 17.07 |
| Gavdos | 0.43 | 0.00 | Patmos | 8.93 | 1.35 |
| Dosnoussa | 0.99 | 0.00 | Rhodes | 232.93 | 66.71 |
| Erikoussa | 0.77 | 0.00 | Samos | 49.63 | 12.75 |
| Thira | 75.09 | 0.25 | Serifos | 6.69 | 0.10 |
| Ikaria | 15.89 | 1.39 | Sifnos | 11.48 | 0.20 |
| Karpathos | 16.50 | 2.39 | Skyros | 8.45 | 0.32 |
| Crete | 796.82 | 279.38 | Symi | 8.60 | 0.19 |
| Kythnos | 5.92 | 0.91 | Syros | 39.25 | 3.83 |
| Kos-Kalymnos | 133.66 | 23.98 | Chios | 77.78 | 14.25 |