Regional Voltage Stability Studies

The regional voltage stability studies are conducted for the Upper North Island (UNI) and Upper South Island (USI) regions.

These studies are carried out twice yearly for the summer and winter peak loads, to assess any voltage stability issues that may arise due to a low generation scenario.   The analysis of these studies are now included in the Upper North and Upper South Island sections of Part D of the System Security Forecast.

The System Operator website has a dedicated page outlining thermal generation decommissioning analysis, including power system operation and security of supply. See Impact of thermal generator decommissioning.

The following reports are the latest reports:

SSF Part D Upper North Island [ pdf 709.16 KB ]
SSF Part D Upper South Island [ pdf 724.3 KB ]

Previous report are linked below:

UNI Regional Studies Winter 2015 [ pdf 850.7 KB ]
USI Regional Studies Winter 2015 [ pdf 868.11 KB ]
UNI Regional Studies Summer 2014 -2015 [ pdf 874.71 KB ]
USI Regional Studies Summer 2014 -2015 [ pdf 878.87 KB ]