New Zealand's Aluminium Smelter

New Zealand's Aluminium Smelter (NZAS) is New Zealand's only aluminium smelter and is located on Tiwai Peninsula, across the harbour from Bluff in Southland.

NZAS is 79.36 per cent owned by Rio Tinto and 20.64 per cent owned by Japan's Sumitomo Chemical Company.  NZAS is a tolling plant, producing primary aluminium in the form of ingot, billet and rolling block. The majority of the plant's alumina is supplied from the Yarwun and Queensland Alumina refineries at Gladstone in Queensland, Australia. Around 90 per cent of the aluminium produced at NZAS is exported.

In the 1960s, Tiwai Point was chosen as the location for an aluminium smelter for a number of reasons. Aluminium smelting requires a large and very reliable power source to continually supply electricity to reduction cells, and Tiwai Point's proximity to the then proposed Manapouri Power Station made it an attractive location. In addition, Tiwai Point was close to the deep sea port of Bluff and the well established infrastructure of the City of Invercargill. The smelter commenced operations in 1971.

NZAS contributes $406 million to the Southland economy (6.5 per cent of Southland's GDP) with export revenue of around $1 billion each year.  Approximately 990 full time equivalent employees and contractors work at the smelter.

Contact Details

Physical Address:
Tiwai Road
Invercargill, New Zealand
Phone : +64 3 218 5999

Postal Address:
Private Bag 90110
Invercargill 9840, New Zealand

Courier Address:
C/O 3 Spey Street
Invercargill, New Zealand

Wellington Office:
Level 10, 342 Lambton Quay
PO Box 1665
Wellington 6140
New Zealand
Phone: +64 4 916 1496


Uses electricity equivalent to





Spends around

$422 million

in New Zealand every year



Generates more than

$600 million

in export earnings annually