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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 | 1200 MW |
| Zone 3 Load | 663.823 MW |
| Zone 3 Margin | 536.177 MW |
| Zone 3 AUVLS enabled | No |
| Electricity Ashburton | 47.143 MW |
| Marlborough Lines | 36.6 MW |
| Buller Electricity | 4.6 MW |
| Network Tasman | 80.3 MW |
| Alpine Energy Ltd | 73 MW |
| Mainpower | 62.2 MW |
| Orion | 349.09 MW |
| Westpower | 17.98 MW |
Updated:
| Top South Island Load Data | |
|---|---|
| GZ 9 Real Time VSAT Limit | 370.3 MW |
| GZ 9 Load | 132.21 MW |
| GZ 9 Margin | 238.09 MW |
| GZ 9 AUVLS enabled | No |
| Marlborough Lines | 36.6 MW |
| Buller Electricity | 4.6 MW |
| Network Tasman | 80.3 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 Winter daily peaks.
| Zone 3 Load | Date |
|---|---|
| 988.963 | 17/05/2026 17:55 |
| 943.713 | 10/05/2026 17:55 |
| 925.654 | 16/05/2026 18:10 |
| 700.143 | 18/05/2026 00:00 |
| 1108.147 | 12/05/2026 07:45 |
| 1087.563 | 14/05/2026 08:00 |
| 1081.547 | 11/05/2026 08:05 |
| 1046.531 | 15/05/2026 08:05 |
| 1028.071 | 13/05/2026 08:15 |
| GZ9 Load | Date |
|---|---|
| 228.56 | 13/05/2026 07:55 |
| 227.95 | 12/05/2026 07:45 |
| 225.55 | 15/05/2026 08:00 |
| 221.96 | 14/05/2026 07:50 |
| 212 | 17/05/2026 17:50 |
| 211.73 | 11/05/2026 17:55 |
| 200.34 | 16/05/2026 17:50 |
| 184.83 | 10/05/2026 17:55 |
| 132.21 | 18/05/2026 05:25 |