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 1052 MW
Zone 3 Load 798.699 MW
Zone 3 Margin 253.302 MW
Zone 3 AUVLS enabled No
Electricity Ashburton 57.256 MW
Marlborough Lines 42 MW
Buller Electricity 2.5 MW
Network Tasman 100.77 MW
Alpine Energy Ltd 83.9 MW
Mainpower 71.6 MW
Orion 437.123 MW
Westpower 15.57 MW
Updated:
Top South Island Load Data
GZ 9 Real Time VSAT Limit 370.9 MW
GZ 9 Load 160.05 MW
GZ 9 Margin 210.85 MW
GZ 9 AUVLS enabled No
Marlborough Lines 42 MW
Buller Electricity 2.5 MW
Network Tasman 100.77 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
1173.55 14/08/2025 08:10
1158.37 23/07/2025 08:10
1157.954 04/08/2025 08:10
1152.026 25/07/2025 08:15
1148.116 24/07/2025 09:00
1145.726 03/07/2025 13:45
1144.595 13/08/2025 07:50
1143.047 21/07/2025 09:50
1141.487 18/06/2025 10:10
1137.129 16/06/2025 09:45
GZ9 Load Date
260.83 12/08/2025 07:30
259.64 10/06/2025 10:05
258.83 06/08/2025 08:15
254.23 25/06/2025 10:05
253.06 20/08/2025 07:50
250.06 24/07/2025 08:25
250.06 23/07/2025 08:00
249.43 21/08/2025 07:30
249.23 07/08/2025 09:35
247.82 09/06/2025 08:00