Information for Industry

Key information for electricity industry participants.
This page shows the HVDC overload limits used by the market system to model the under frequency instantaneous reserves (IR) required for a HVDC Contingent Event (the loss of a HVDC pole)
Major outages of the HVDC poles scheduled in Jan to Apr 2020. Communication from the system operator will be published on this page
Transpower as the System Operator has commenced analysis to determine what the impacts of Tiwai’s exit in August 2021 will have on the operation of the power system and security of supply.
We have undertaken studies to determine what the impacts of the decommissioning of Otahuhu and Southdown Power Stations & the last 2 Rankine units at Huntly Power Station will have on the grid.