Might want to switch off the hot water cylinder and any other non essential loads until they fix the HVDC cable.
[edited to add]
Bad time for this to happen as the Otahuhu B gas power station has been decommissioned. And they are in the process of decommissioning the Southdown gas power station as well. And since the weather has been dry for awhile, there wont be much water available for the Tongariro and Waikato hydro stations.