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 1317.4 MW
Zone 3 Load 1100.538 MW
Zone 3 Margin 216.862 MW
Zone 3 AUVLS enabled No
Electricity Ashburton 51.926 MW
Marlborough Lines 60 MW
Buller Electricity 2.1 MW
Network Tasman 129.65 MW
Alpine Energy Ltd 83.1 MW
Mainpower 98.1 MW
Orion 668.89 MW
Westpower 10.08 MW
Updated:
Top South Island Load Data
GZ 9 Real Time VSAT Limit 378.7 MW
GZ 9 Load 205.95 MW
GZ 9 Margin 172.75 MW
GZ 9 AUVLS enabled No
Marlborough Lines 60 MW
Buller Electricity 2.1 MW
Network Tasman 129.65 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
1145.726 03/07/2025 13:45
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
1121.112 02/07/2025 09:05
1120.517 06/06/2025 08:10
1114.263 24/06/2025 07:50
GZ9 Load Date
259.64 10/06/2025 10:05
254.23 25/06/2025 10:05
247.82 09/06/2025 08:00
246.75 02/07/2025 09:05
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