The price of aluminium has exploded in the last six months – so much so that Rio Tinto now wants to delay the closure of the aluminium smelter it owns at Tiwai Point beyond the planned end date of 2024. But this decision has thrown a big spanner into the works of climate change planners, investors and politicians, who had been working under the assumption that, come 2024, the 13% of the nation’s power supply that Tiwai Point uses would become available to help cities decarbonise their transport fleets. To find out more about what Tiwai Point staying would do for our climate plans, Bernard talks to climate change minister James Shaw and renewable energy expert Rebecca Peer.

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