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Power system loads in the South Island north of Waitaki Valley (Zone 3) are displayed on this page to give power companies loading information across the zone.
This information is updated every five minutes. Due to the location of recording equipment at some sites, the load split between retailers for these zones is indicative only.
The historical Zone Load Peaks are winter and summer seasonal values and are reset at the change of seasons on 20 October and 10 May.
Updated:
| Upper South Island Load Data | |
|---|---|
| Zone 3 Real Time VSAT Limit | 1086.4 MW |
| Zone 3 Load | 640.132 MW |
| Zone 3 Margin | 446.268 MW |
| Zone 3 AUVLS enabled | No |
| Electricity Ashburton | 39.044 MW |
| Marlborough Lines | 44 MW |
| Buller Electricity | 4.3 MW |
| Network Tasman | 71.8 MW |
| Alpine Energy Ltd | 76.4 MW |
| Mainpower | 50.8 MW |
| Orion | 345.423 MW |
| Westpower | 15.99 MW |
Updated:
| Top South Island Load Data | |
|---|---|
| GZ 9 Real Time VSAT Limit | 299.5 MW |
| GZ 9 Load | 129.01 MW |
| GZ 9 Margin | 170.49 MW |
| GZ 9 AUVLS enabled | No |
| Marlborough Lines | 44 MW |
| Buller Electricity | 4.3 MW |
| Network Tasman | 71.8 MW |
Latest Zone Load Graphs
Zone 3 Load (Upper South Island)
Updated:
GZ 9 Load (Nelson)
Updated:
Historical Zone Load Peaks
Top 10 now reflects Summer daily peaks.
| Zone 3 Load | Date |
|---|---|
| 1047.465 | 29/10/2025 07:50 |
| 1046.546 | 28/10/2025 09:35 |
| 1042.927 | 03/03/2026 09:50 |
| 1039.828 | 02/03/2026 10:15 |
| 1033.559 | 26/03/2026 09:40 |
| 1033.308 | 25/03/2026 09:45 |
| 1030.367 | 24/03/2026 09:45 |
| 1020.751 | 27/03/2026 09:50 |
| 1012.833 | 04/11/2025 07:45 |
| 1012.787 | 20/10/2025 08:15 |
| GZ9 Load | Date |
|---|---|
| 222.59 | 26/03/2026 09:55 |
| 222.2 | 27/02/2026 10:35 |
| 219.5 | 27/03/2026 10:00 |
| 216.89 | 25/02/2026 20:25 |
| 209.67 | 24/02/2026 21:00 |
| 208.4 | 01/04/2026 09:45 |
| 207.8 | 25/03/2026 10:00 |
| 206.65 | 20/03/2026 08:10 |
| 206.05 | 18/02/2026 10:15 |
| 204.56 | 24/03/2026 21:15 |