| Line | Umax,maxi (kV) | Umin,mini (kV) | max{Umaxi + Umini)/2} (kV) | max{Umaxi − Umini} (kV) |
| Substation of Xanthi | ||||
| X21 | 21.4 | 20.6 | 21.1 | 0.4 |
| X22 | 22.3 | 19.4 | 21.0 | 2.9 |
| X32 | 21.4 | 20.9 | 21.2 | 0.4 |
| X33 | 21.5 | 20.9 | 21.2 | 0.5 |
| X34 | 21.4 | 20.8 | 21.2 | 0.5 |
| X35 | 21.4 | 21.0 | 21.2 | 0.4 |
| X36 | 21.4 | 20.6 | 21.2 | 0.7 |
| X37 | 21.4 | 20.8 | 21.2 | 0.4 |
| X38 | 21.6 | 21.0 | 21.4 | 0.4 |
| Substation of Magiko | ||||
| M33 | 21.4 | 20.8 | 21.1 | 0.4 |
| M34 | 21.4 | 20.5 | 21.2 | 0.4 |
| M35 | 21.4 | 21.0 | 21.2 | 0.4 |
| M36 | 21.4 | 20.1 | 21.2 | 0.5 |
| M37 | 21.4 | 20.3 | 21.2 | 0.7 |
| M39 | 21.4 | 20.9 | 21.2 | 0.5 |
| M40 | 21.2 | 20.5 | 21.0 | 0.3 |
| M41 | 21.4 | 20.3 | 21.2 | 0.4 |
| M42 | 21.4 | 20.9 | 21.2 | 0.4 |
| Substation of Iasmos | ||||
| I21 | 21.7 | 20.8 | 21.2 | 0.9 |
| I22 | 21.3 | 20.3 | 21.0 | 0.7 |
| I32 | 20.9 | 20.4 | 20.9 | 0.3 |