13 Oct 2022
As a result of a fault on the HVDC system which transfers electricity from the South Island to the North Island this morning Transpower called a grid emergency.
The grid emergency allowed the System Operator to work with lines companies to remove controllable load like hot water systems until the fault was able to be resolved. Hot water systems are switched on and off regularly during winter and New Zealanders will not have noticed any impact.
Transpower CEO Alison Andrew said that Transpower worked quickly to maintain system security during the grid emergency.
“We have a grid emergency system in place for exactly this type of situation,” Ms Andrew said.
“Lines companies knew what was expected of them and they moved quickly to manage controllable load and reduce demand. No consumers were disconnected and the system stayed stable throughout.”
She thanked New Zealanders who had taken action to be mindful of their power usage. “Fortunately we were able to resolve the issue before we had to cut additional demand which would have resulted in some consumers being disconnected. We are grateful to those New Zealanders who took action to reduce their usage.”
The HVDC is now fully operational and there is plenty of power available for the North Island.
UPDATE: Transpower has engaged an independent specialist to investigate the HVDC Power Limit event on 7 October 2022. Their findings, along with Transpower's response to the findings are listed below.
Downloads
PBA Independent Review of HVDC Power Reduction Event 7 October 2022
Transpower's response to the Independent Review