Both South Island alpine passes were reopened by the end of today after being closed by heavy snow and fallen trees.
An New Zealand Transport Agency spokeswoman said Lewis Pass and Arthur's Pass were now open but advised drivers to take "extreme care".
Drivers were told to watch out for ice and to carry chains.
Meanwhile, Orion said just a handful of Canterbury homes remained without power this evening.
Spokeswoman Gina Clarke said there was about "10 or so scattered properties in remote rural areas" still without power.