New Zealand Aluminium Smelters (NZAS) has signed 20-year electricity arrangements that secure the future of the Tiwai Point aluminium smelter to continue competitively producing high-purity, low-carbon metal, backed by a diversified mix of renewable electricity from New Zealand’s South Island. NZAS, which owns and operates Tiwai Point, has signed contracts with electricity generators Meridian Energy, Contact Energy and Mercury NZ to set pricing for an aggregate of 572 megawatts (MW) of electricity to meet the smelter’s full electricity needs. The agreements, which are subject to regulatory approvals and other conditions, are expected to commence in July 2024 and run until at least 2044.

In a separate transaction, Rio Tinto has entered into an agreement to acquire Sumitomo Chemical Company Limited’s (SCC’s) 20.64% interest in NZAS for an undisclosed price. On completion of the transaction, NZAS will be 100% owned by Rio Tinto.

Rio Tinto Aluminium Chief Executive Jérôme Pécresse said “We are pleased the long-term future of the Tiwai Point smelter has been secured with these agreements, which were reached with a genuinely collaborative spirit between all parties. They give us confidence that our New Zealand workforce and assets can continue competitively producing the high purity, low-carbon aluminium needed for the global energy transition”.

The new electricity arrangements include 20-year demand response agreements with Meridian Energy and Contact Energy, under which NZAS may be requested to reduce electricity consumption by up to a total of 185MW. This will help ensure secure electricity supply to New Zealand homes and businesses when it is most needed.