But Transpower chief executive Patrick Strange says if a major power plant fails, the country - especially the North Island - will be in trouble.
Dr Strange said, when contacted yesterday, he was encouraged by power savings achieved by consumers.
He could see the light at the end of the tunnel if the power savings continued and more rain arrived.
The Upper South Island was the leading power saving region in the country for the week ending yesterday, with a saving of 3.4%.
The national average was 3.1% and coupled with savings by large industrial companies, the total savings were more than 5%.
The lower South Island region saved about 3.2%, while the lower North Island region was the poorest saver with 3%.
Dr Strange said winter was now putting pressure on the system with a major front moving up the country yesterday.
But people should not go without heat and he urged the elderly to stay warm.
Simple measures such as shorter showers, and turning off unnecessary sources of power, helped the campaign to save power.
Thanks to the recommissioning of pole one on the Cook Strait cable, and the firing up of the previous decommissioned New Plymouth power plant, the electricity supply was not facing shortfalls.
But it took just one plant to fail and the country, especially the North Island, would be in trouble, he said.
Power companies were being responsible by checking power plants were running at 100% capacity.
Any repairs were being made at off-peak times.
Rain during the weekend had missed the main South Island hydro-electricity lakes but had fallen in smaller regional lakes such as Cobb at the top of the South Island and Matahina in Bay of Plenty.
Lake Taupo, which was low, had received a good dumping and steady inflows were boosting its level.
Lakes Pukaki and Tekapo were in the same position as two to three weeks ago, although snow was falling in that area, so inflows were low.
Dr Strange said Niwa had predicted below average to average inflows into the large South Island hydro-electricity lakes and, if this happened, the country's electricity supply should be all right for the winter.
"But the New Zealand weather system is a bit random so we can not totally rely on it."
