Overview
Transpower uses variable line ratings on 13 key circuits around New Zealand. The circuits are listed in the following table.
| Circuit | |
| North Island | South Island |
| Atiamuri-Ohakuri-1 (ATI-OHK-1) | Glenavy-Oamaru-2 (GNY-OAM-2) |
| Ohakuri-Wairakei-1 (OHK-WRK-1) | Blackpoint Tee-Oamaru-1 (BPC-OAM-1) |
| Otahuhu-Hautapu-Whakamaru-1 (OTA-HTU-WKM-1) | |
| Otahuhu-Hautapu-Whakamaru-2 (OTA-HTU-WKM-2) | |
| Lichfied-Tarukenga 1 (LFD-TRK-1) | |
| Lichfied-Tarukenga 2 (LFD-TRK-2) | |
| Kinleith-Lichfield 1 (KIN-LFD-1) | |
| Kinleith-Lichfield 2 (KIN-LFD-2) | |
| Atiamuri-Whakamaru 1 (ATI-WKM-1) | |
| Kawerau-Matahina 1 (KAW-MAT-1) | |
| Kawerau-Matahina 2 (KAW-MAT-2 |
The file below contains the variable ratings that are being used on circuits.