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Transpower says at times of high demand, homes could still face short outages to avoid a major blackout.
The grid-operator was two weeks ago fined $150,000 for 34,000 homes losing power in August 2021.
Chief Executive Alison Andrew says changing conditions and demand spikes can use up the buffer they maintain within the system.
She says if that still isn't enough, they have a difficult choice.
"We'll then need to work with the distribution companies to turn off power for a short period of time. We're working very hard to make sure we avoid turning off anyone that we don't need to."
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