Back to overview Home Fossil Energy Santos seals ten-year gas supply deal Santos seals ten-year gas supply deal Business Developments & Projects June 29, 2026, by Melisa Cavcic Share this article Australia’s energy player Santos has ironed out a decade-long gas supply agreement with the South Australian government. Illustration; Source: Santos Santos has executed a gas sale agreement (GSA) with the South Australian government to supply 20 PJ per annum, or 200 PJ in total, of domestic gas for the strategic gas reserve over ten years from March 1, 2030, coinciding with the expiry of the firm’s Horizon contract with the GLNG joint venture. This deal, which is valid to 2040, follows the agreement of key terms on February 20, 2026. This GSA is interpreted to support the long-term future of the Central fields near Moomba in South Australia, which contain more than 50% of the remaining 2P reserves in the Cooper Basin after the Australian giant and its joint venture partner, Beach Energy, took a final investment decision (FID) in March 2026 to proceed with the Moomba Central Optimisation (MCO) project. The development is anticipated to unlock the full productivity of the Central fields and reduce unit production cost and carbon emissions. The prepayment structure of the GSA will directly support Santos’ capex investment in the MCO project, which is planned to be delivered over three years.  Kevin Gallagher , Santos’ Managing Director and Chief Executive Officer, highlighted: “This agreement helps secure affordable domestic gas supply for South Australian industry to 2040 and enables Santos to invest in the long-term future of the Cooper Basin. “Santos is an important corporate citizen of Adelaide and South Australia, employing around 700 people in Adelaide and another 400 in Port Bonython, Whyalla and Moomba. This agreement helps secure jobs in Adelaide and regional South Australia for at least the next 15 years.” The project is designed to replace seven