The continued operation of the country's biggest gas user emerges as essential to keeping electricity prices low through the 2030s.
High wholesale spot prices and low rainfall have hurt Mercury's full-year earnings prospects, along with an unexpected breakdown at one of its geothermal plants.
Tiwai Point aluminium smelter’s operations will probably be extended past 2024 but it will pay a higher price for electricity.
The Canterbury deluge doesn't appear to have helped South Island hydro lakes.
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