Woodside has signed a sale and purchase agreement with Alcoa of Australia (Alcoa) for the portfolio supply of 31.1 petajoules of domestic gas from Woodside’s Western Australian operations, covering the period from 2027 to 2030.
The agreement strengthens an already established commercial relationship between the two companies.
Woodside Executive Vice President Marketing and Chief Commercial Officer Mark Abbotsford welcomed the new deal, noting it builds upon a longstanding supplier-customer relationship.
“Woodside is continuing to bring gas to the Western Australian market, supporting local industries and contributing to the state’s energy security later this decade,” said Abbotsford.
“This gas will be supplied to Alcoa’s Western Australian refineries, which provide thousands of local jobs and produce alumina, the feedstock for aluminium, a key material for the construction, manufacturing and energy sectors.”
Abbotsford said the deal was further evidence of a well-functioning domestic gas market in the state.
“The agreement again demonstrates the Western Australian domestic market is operating in a way which supports both gas producers and consumers.
“It also underlines the ongoing effectiveness of Western Australia’s domestic gas policy in providing stable and predictable policy settings that underpin the delivery of gas to major industrial users, enabling lower-emissions energy use in key processing sectors.”
The agreement follows approval from the Western Australian state government in December 2025 to extend the operation of the Pluto-Karratha Gas Plant Interconnector.
That approval allows additional Pluto-sourced gas to be processed using existing capacity at the Karratha Gas Plant, enabling it to be brought to market quickly as a new contracted domestic supply.
Woodside has a long history of supplying gas into the Western Australian market, having done so for more than 40 years.
In 2025, the company’s share of Western Australian natural gas production reached 90.3 petajoules, representing approximately 21 per cent of the state’s total domestic gas supply.
Woodside said it continues to engage with the Western Australian market on additional supply for 2026 and beyond, as part of its ongoing commitment to meeting local industrial and energy needs.
The Alcoa agreement adds to a series of domestic supply arrangements Woodside has secured in recent years, as the company positions its Pluto and Karratha gas operations to serve both export markets and Western Australia’s industrial base.
The deal underscores the role gas continues to play in supporting energy-intensive industries such as alumina refining, which remains a significant contributor to the state’s economy and employment.
With the new agreement locking in supply through to the end of the decade, Alcoa’s refineries will have continued access to a stable gas source to support ongoing alumina production, while Woodside reinforces its position as a key supplier to Western Australia’s domestic energy market.
