Upper South Island loads

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 1288.8 MW
Zone 3 Load 1029.755 MW
Zone 3 Margin 259.045 MW
Zone 3 AUVLS enabled No
Electricity Ashburton 54.266 MW
Marlborough Lines 65 MW
Buller Electricity 4.2 MW
Network Tasman 126.55 MW
Alpine Energy Ltd 73.2 MW
Mainpower 100.9 MW
Orion 598.201 MW
Westpower 10.94 MW
Updated:
Top South Island Load Data
GZ 9 Real Time VSAT Limit 384.6 MW
GZ 9 Load 210.35 MW
GZ 9 Margin 174.25 MW
GZ 9 AUVLS enabled No
Marlborough Lines 65 MW
Buller Electricity 4.2 MW
Network Tasman 126.55 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
1141.487 18/06/2025 10:10
1137.129 16/06/2025 09:45
1133.56 11/06/2025 09:05
1132.427 10/06/2025 09:05
1130.909 09/06/2025 09:10
1123.745 17/06/2025 09:25
1120.517 06/06/2025 08:10
1114.263 24/06/2025 07:50
1110.099 25/06/2025 07:55
1105.639 20/05/2025 08:35
GZ9 Load Date
259.64 10/06/2025 10:05
254.23 25/06/2025 10:05
247.82 09/06/2025 08:00
246.56 18/06/2025 10:10
241.68 17/06/2025 09:35
239.07 11/06/2025 09:05
238.56 16/06/2025 17:55
236.73 19/06/2025 09:05
234.53 24/06/2025 10:50
232.01 15/05/2025 08:05