Tiwai Point Aluminium Smelter
The Tiwai Point Aluminium Smelter is an aluminium smelter owned by Rio Tinto Group (79.36%) and the Sumitomo Group (20.64%),[1] via a joint venture called New Zealand Aluminium Smelters Limited.[2]
The facility, New Zealand’s only aluminium smelter,[3] is at Tiwai Point, near Bluff. It imports alumina and processes it into primary aluminium. The plant's alumina is supplied from refineries in Queensland and the Northern Territory of Australia. Around 90 per cent of the aluminium produced at NZAS is exported, mainly to Japan.[4]
The smelter was opened in 1971[2] following the construction of the Manapouri Power Station by the New Zealand government to supply it with electricity. It uses 13 percent of New Zealand's electricity,[5][6] and is reported to account for 10 percent of the Southland region's economy.[7]
History
In 1955, a geologist working for Consolidated Zinc Proprietary Ltd (ConZinc) identified a commercial deposit of bauxite in Australia on the west coast of Cape York Peninsula. The company investigated sources of large quantities of cheap electricity needed to reduce the alumina recovered from the bauxite into aluminium. In 1960, ConZinc reached an agreement with the government for it to build a smelter and power station using the hydroelectric capacity of Lake Manapouri and Lake Te Anau. In 1963, ConZinc decided not to build the power station, and following that decision the government decided to construct it, with power first being generated in 1969. Construction of the Manapouri Power Station attracted controversy for its environmental effects, with over 264,000 New Zealanders signing the Save Manapouri petition. With a supply of electricity to be available, ConZinc built the Tiwai Point smelter, opening in 1971.[2]
Tiwai Point is the only aluminium smelter in New Zealand. In December 1980, the government announced a project that would build a second smelter at Aramoana, but opposition from the public, changes in the aluminium market, and the loss of a commercial partner meant the project did not go ahead.[2]
Operations
The smelter uses the Hall-Héroult process to convert alumina (aluminium oxide) to elemental aluminium. Bauxite is mined in Australia and refined into alumina before being shipped to New Zealand.[8] The smelter consists of three lines of P69 technology cells, with 208 cells each (i.e. 624 total), and one line of 48 CD200 technology cells. The third P69 Line was built in the early 1980s as part of the Muldoon government's "Think Big" projects.
The smelter produces the world’s purest aluminium[2] – 99.98 percent pure[9] – and is one of two smelters in the world producing ultrahigh purity aluminium.[10] In 2011 the smelter produced 354,030 saleable tonnes of aluminium, which was its highest ever output at the time.[11] In 2015, it produced 335,290 tonnes.[12]
Financial Results
Taken from the Statistical Review of Comalco's New Zealand Activities, page 22 of the 1993 Annual Report.
Year Tonnes Aluminium Price Nett Profit Employees 1979 153,537 1575 -1,172,000 1,252 1980 154,740 1770 17,470,000 1,258 1981 153,979 1302 2,941,000 1,359 1982 163,419 1026 -20,698,000 1,452 1983 218,609 1478 -9,665,000 1,651 1984 242,850 1281 1,766,000 1,631 1985 240,835 1072 -24,772,000 1,529 1986 236,332 1160 -18,188,000 1,506 1987 248,365 1496 92,570,000 1,429 1988 257,006 2367 173,040,000 1,770 1989 258,359 1915 118,500,000 1,820 1990 259,408 1635 42,051,000 1,720 1991 258,790 1333 -34,122,000 1,465 1992 241,775 1279 -18,649,000 1,415 1993 267,200 1161 -18,016,000 1,465
The smelter production is in tonnes of saleable metal, the aluminium price is the average London Metal Exchange 3 month in US$/tonne, the Nett Profit/Loss is after tax and NZ$. The employee count includes contract employees and the full-time equivalent of part-time employees. Comalco-CHH Aluminium employees are not included from 1990; 425 were employed in 1993.
Note that for aluminium to be sold, bauxite must be imported.
Electricity use
The smelter's power demand from the national grid is about 570 MW. Most of the energy for the smelter is supplied from the Manapouri hydroelectric power station, via two double circuit 220 kV transmission lines. The facility is the largest electricity consumer in New Zealand, and uses approximately one third of the total electricity consumed in the South Island and 13% of the total electricity nationwide, equivalent to about 680,000 households.[5]
New Zealand Aluminium Smelters has a contract for electricity supply with Meridian Energy for the continuous supply of 572 megawatts for the period 2013 to 2030.[13] A variation of this agreement was signed in 2015.[5]
Economic effects and threats of closure
NZAS reports that the facility employs 800 full-time employees and contractors and indirectly creates jobs for 3,000 people.[12] The smelter is reported to account for 10 percent of the Southland region's economy.[7]
Tiwai Point has frequently operated at a loss, such as in 2012 when it lost $548 million.[14] Analysts have commented that the profitability of the smelter is most dependent on prices for electricity, alumina and the finished aluminium as well as the New Zealand dollar.[6][15] Between 2008 and 2013, aluminium prices fell by more than 30 percent.[16] Rio Tinto threatened to close the Tiwai Point smelter if it could not get a cheaper deal for electricity from retailer Meridian, or the Government failed to give it a substantial subsidy to cover losses.[17]
Much media commentary[18] in April 2013 focused on the impact of closure on both domestic power prices and share prices when the State Owned Enterprise and electricity generator Mighty River Power would be partially sold off to private investors. NZAS produced a report which claimed that if the smelter closed, there would be a permanent loss to Southland's GDP of about 7-8 percent and that 2-3 percent of Southland's population could move out of the region.[9] Invercargill mayor Tim Shadbolt said it was a myth that closing the smelter would result in lower prices, and vowed to keep it open.[19]
In August 2013, the New Zealand government agreed to make a $30 million payment to NZAS as a deal to support the smelter and to save jobs, exchange for agreeing the smelter cannot be closed before January 2017.[20] Finance Minister Bill English said the Government would make no further contribution to support it,[20] which he reiterated in 2015 following speculation that Rio Tinto was seeking to sell the smelter.[14]
In 2016, an analyst First New Zealand Capital (FCNZ) utilities said that the smelter was thought to be breaking even, and that favourable currency rates and low alumina prices were helping matters.[6]
In October 2019, Rio Tinto announced that it was undertaking a strategic review of the Tiwai Point Aluminium Smelter, including a wide range of issues associated with closure. The NZAS chief executive Stew Hamilton said that they had been losing money for the last 12 months, and that options ranged from operating at the status quo, which would require cheaper power, to closure of the plant. [21]
On 31 March, Rio Tinto announced that it will close potline four, to ensure it can cope with the restrictions at the plant that are needed because of the coronavirus pandemic. Potline 4 originally opened in 1996 but was turned off for six years between 2012 and 2018 before reopening as a result of an uptick in aluminium prices and a new deal with power supplier Meridian. Potline four is smaller than the smelter's other three potlines, producing about 31,000 tonnes of aluminium a year, or about 9 per cent of the smelter's total output, and consumes about 50 MW of electricity. [22]
Environmental effects
Aluminium smelting via the Hall-Héroult process produces carbon dioxide as a by-product. The basic reaction is Al2O3 → 2Al + 3O; if all the oxygen at the red-hot carbon anode becomes carbon monoxide (that subsequently becomes carbon dioxide) then for one tonne of aluminium, 1.55 tonnes of CO would result, becoming 2.4 tonnes of CO2. However, if all the oxygen went directly to CO2, then 1.56 tonnes of CO2 would result. At the stated rate of 1.97 tonnes of carbon dioxide per tonne of aluminium, the production of 272,000 tonnes of aluminium in a year would emit 535,000 tonnes of carbon dioxide. In 2007, Tom Campbell, the chief executive of majority owner Rio Tinto Aluminium NZ, said that the smelter was among the top 5% of the world's 250 aluminium smelters in terms of low emissions.[13] Metal produced by Tiwai Point is marketed under the RenewAl brand, which guarantees that less than four tonnes of CO2 is emitted for every tonne of aluminium produced.[23]
References
- "Aluminium". riotinto.com. Retrieved 2017-01-12.
- Cook, Megan (11 March 2010). "Pulp and paper, aluminium and steel industries – 3. Aluminium". teara.govt.nz. Retrieved 2017-01-12.
- Grant, David. "Aluminium smelter, Tīwai Point". teara.govt.nz. Te Ara - The Encyclopedia of New Zealand. Retrieved 2017-01-12.
- "New Zealand Aluminium Smelters Limited". Rio Tinto Alcan. 2011. Retrieved 25 August 2011.
- Devlin, Collette; McCarthy, Phil (3 August 2015). "Tiwai Smelter deal signed between Meridian Energy and NZAS". stuff.co.nz. Retrieved 2017-01-13.
- Woolf, Amber-Leigh (24 January 2016). "Tiwai Point aluminium smelter has "reassuring start" to 2016 as New Zealand dollar and alumina prices fall". stuff.co.nz. Retrieved 2017-01-13.
- "Tim Shadbolt vows to save smelter". newshub.co.nz. 4 April 2013. Retrieved 2017-01-12.
- "How Aluminium is Made" (PDF). New Zealand Aluminium Smelters Limited. Retrieved 12 January 2017.
- "The economic and social impacts of New Zealand Aluminium Smelters Limited on the Southland economy" (PDF). New Zealand Aluminium Smelters Limited. 2013. Retrieved 2017-01-13.
- Anthony, John (23 April 2015). "Tiwai Point profitable despite tough conditions". stuff.co.nz. Retrieved 2017-01-13.
- "Aluminium record set in 2011". Radio New Zealand. 2012-02-02. Retrieved 2017-01-13.
- "NZAS Facts". nzas.co.nz. New Zealand Aluminium Smelters Limited. Retrieved 2017-01-12.
- Bennett, Adam (3 October 2007). "Meridian boss hails deal with smelter". New Zealand Herald. Archived from the original on 25 August 2011. Retrieved 24 August 2011.
- Lin, Tao (19 May 2015). "Speculation that Rio Tinto's Tiwai Point smelter for sale". stuff.co.nz. Retrieved 2017-01-13.
- Hunter, Tim (20 April 2015). "Tiwai Point aluminium smelter 'squarely in the black': analyst". stuff.co.nz. Retrieved 2017-01-13.
- "Smelter's woes blamed on excess supply". 3 News NZ. April 3, 2013.
- "Rio Tinto rejects Govt's subsidy offer". 3 News NZ. April 2, 2013.
- "John Key's Game of Two Halves". SST. April 7, 2013.
- "Tim Shadbolt vows to save smelter". 3 News NZ. April 5, 2013.
- "Govt pays $30 million to Tiwai Pt". Stuff.co.nz. 2013-08-08. Retrieved 2017-01-12.
- "Rio Tinto 'not bluffing' about threat to shut Tiwai Point smelter". stuff.co.nz. 30 October 2019. Retrieved 31 Mar 2020.
- "Rio Tinto to close one of four potlines at Tiwai Point aluminium smelter". stuff.co.nz. 31 March 2020. Retrieved 31 Mar 2020.
- "Sustainable Development Report 2015" (PDF). NZAS. Retrieved 2017-01-13.