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 1225.2 MW
Zone 3 Load 658.215 MW
Zone 3 Margin 566.985 MW
Zone 3 AUVLS enabled No
Electricity Ashburton 32.371 MW
Marlborough Lines 33.9 MW
Buller Electricity 4.5 MW
Network Tasman 90.95 MW
Alpine Energy Ltd 63.5 MW
Mainpower 59.8 MW
Orion 364.334 MW
Westpower 11.81 MW
Updated:
Top South Island Load Data
GZ 9 Real Time VSAT Limit 383.6 MW
GZ 9 Load 142.45 MW
GZ 9 Margin 241.15 MW
GZ 9 AUVLS enabled No
Marlborough Lines 33.9 MW
Buller Electricity 4.5 MW
Network Tasman 90.95 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
1158.37 23/07/2025 08:10
1152.026 25/07/2025 08:15
1148.116 24/07/2025 09:00
1145.726 03/07/2025 13:45
1143.047 21/07/2025 09:50
1141.487 18/06/2025 10:10
1137.129 16/06/2025 09:45
1136.83 17/07/2025 09:05
1133.56 11/06/2025 09:05
1132.427 10/06/2025 09:05
GZ9 Load Date
259.64 10/06/2025 10:05
254.23 25/06/2025 10:05
250.06 24/07/2025 08:25
250.06 23/07/2025 08:00
247.82 09/06/2025 08:00
246.75 02/07/2025 09:05
246.56 18/06/2025 10:10
246.35 22/07/2025 09:35
245.36 21/07/2025 09:50
244.64 25/07/2025 08:05