The Tiwai Point aluminium smelter is reducing production as a result of Covid-19.
New Zealand's largest user of electricity said it planned to shut down line four of the smelter and was talking to Meridian about reducing the electricity load which supported it.
"The work to deliver this will take place this week where we will release the Line four team of 35 people to support production on the other three full lines," NZAS chief executive Stew Hamilton said in a statement.
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Hamilton said NZAS was making the move "to support the health and safety of our employees at NZAS and in accordance with government directives in relation to containing the spread of Covid-19".