Santos Limited has committed $357 million to modernise infrastructure at its Cooper Basin operations, unlocking decades of lower-cost gas production from one of Australia’s most important energy assets.
Santos Limited (ASX: STO) and its joint venture partner Beach Energy have taken a final investment decision (FID) on the Moomba Central Optimisation (MCO) Project in the Cooper Basin, South Australia. The announcement, made on 9 Mar 2026, confirms a three-year infrastructure overhaul targeting over $600 million in combined capital and operating expenditure savings.
Figure 1: Santos Limited corporate office signage displayed at the company’s headquarters building. [Source: Santos]
The Santos Moomba Project update marks one of the most significant infrastructure commitments the Company has made in recent years. By modernising ageing compressor infrastructure and unlocking the full productivity of the Central Fields, Santos is positioning the Cooper Basin for long-term output well beyond 2040.
Why the Santos Moomba Project Update Matters?
Investors and the energy sector alike have closely watched Santos Energy news Australia, and this decision delivers a clear signal of strategic intent. The MCO Project targets a reduction in unit production cost of up to $3 per barrel of oil equivalent, a meaningful improvement in the economics of one of Australia’s most established gas basins.
The Project also connects directly to a government supply commitment. Santos recently signed a Key Term Sheet with the South Australian government to supply 20 petajoules of gas per year from 2030 to 2040 for the State’s Strategic Gas Reserve. Subject to a fully-formed gas supply agreement, the Company intends to direct prepayment funds from that deal into the MCO Project, further strengthening its return profile.
What is Moomba Gas Project?
The Moomba gas Project involves replacing seven ageing gas-driven compressor stations with a single modern electric-driven compressor station. This change will debottleneck upstream infrastructure across the Cooper Basin’s Central Fields area, which holds more than half of the remaining 2P reserves in the basin.
Figure 2: Moomba Gas Plant in the Cooper Basin, South Australia. [Source: Santos]
At the Moomba Gas Plant, new inlet compression and additional power generation capacity will be installed to receive gas and power from upstream satellite operations. The upgrade is designed to unlock the full productive potential of the Central Fields, which are home to the basin’s highest-productivity wells.
Key Project metrics for the Moomba Central Optimisation Project:
- Targeting capex and opex savings of over $600 million (net Santos) across the life of the Central Fields
- Unit production cost reduction of up to $3 per barrel of oil equivalent
- Expected internal rate of return of greater than 15 per cent
- Payback period of six years
- Central Fields full-field development IRR expected to exceed 25 per cent
- Targeting Scope 1 emissions reduction of approximately 40,000 tonnes of COâ‚‚ equivalent per year
The Cooper Basin and Its Role in Australian Energy
The Cooper Basin is located in South Australia and is one of the country’s most significant onshore gas production regions. The Moomba Gas Plant sits at the centre of the basin’s processing and distribution network, supplying gas to South Australian and eastern Australian markets.
The Central Fields area, which is the primary focus of the Santos Moomba Project update, represents the highest-productivity portion of the basin. Modernising infrastructure here is expected to improve the economics of the Moomba gas Project and strengthen gas extraction performance across the entire field network.
Timeline and Capital Commitment
Santos and Beach Energy confirmed the final investment decision on 9 Mar 2026. The MCO Project is planned for delivery over three years, and Santos has fully budgeted the $357 million net capital commitment. The Company confirmed it will remain within its $45 to $50 per barrel all-in free cash flow breakeven target throughout the Project.
Figure 3: COâ‚‚ absorber towers at the Moomba Gas Plant remove carbon dioxide from raw gas during processing. [Source: Santos]
The timing aligns with the broader South Australian energy security agenda. The Strategic Gas Reserve agreement runs from 2030 to 2040, and the Santos Moomba Project is expected to support productive life in the Cooper Basin well beyond that period.
Funding Structure and Project Economics
Santos Limited has fully budgeted the $357 million net capex within its existing capital framework. Subject to concluding a fully-formed gas supply agreement with the South Australian government, the Company intends to use prepayment funds from the 20 PJ per year Strategic Gas Reserve deal to invest in the MCO Project.
This funding structure allows Santos to direct forward-contracted gas revenues into infrastructure modernisation, reducing the net draw on its own balance sheet. The Project’s IRR of greater than 15 per cent and six-year payback period reflect strong return characteristics for an infrastructure investment of this scale within Santos Energy News Australia’s broader capital story.
Santos Share Price and Market Overview
Santos Limited (ASX: STO) last traded at $7.730 per share, with a market capitalisation of $24.22 billion. The Company’s 52-week range sits between $5.200 and $8.060 per share, reflecting a period of meaningful price recovery as Santos Energy News Australia has drawn renewed investor attention.
Figure 4: Santos Limited (ASX: STO) share price performance over the past 12 months. [Source: ASX]
The FID on the Moomba gas Project lands at a point where the stock is trading closer to its 12-month highs, and the market will be watching whether this capital commitment further supports that momentum.
Industry Outlook
Australia’s domestic gas market remains under structural pressure, with east coast demand continuing to outpace new supply commitments. The Cooper Basin, as one of the country’s longest-running onshore gas regions, plays a disproportionate role in underpinning baseload supply for South Australia and the eastern seaboard.
Infrastructure modernisation, such as the Santos Moomba Project update, is increasingly central to sustaining output from mature basins without the capital intensity of greenfield development. Moreover, for investors tracking Santos Energy news Australia, Projects that combine meaningful cost reduction with emissions improvement represent the clearest signal of long-term asset quality.
Future Direction and Industry Impact
The MCO Project positions Santos Limited to fully develop the Central Fields, with a full-field development IRR expected to exceed 25 per cent once the optimisation infrastructure is in place. The electric-driven compressor station will also reduce the Company’s Scope 1 emissions by approximately 40,000 tonnes of COâ‚‚ equivalent per year, supporting Santos’ broader climate commitments.
With the South Australian gas supply agreement locked in through 2040 and the Moomba gas Project securing the basin’s productive life beyond that horizon, the long-term value case for the asset is considerably stronger. Investors will be watching the finalisation of the gas supply agreement and Project delivery milestones as key near-term catalysts for Santos Energy News Australia.
Frequently Asked Questions
Q1. What does the Santos Moomba Project update mean for investors?
The Santos Moomba Project update signals a disciplined capital allocation move with a projected IRR of greater than 15 per cent and a six-year payback period.
Q2. How will the Moomba Central Optimisation Project be funded?
Ans. Santos has fully budgeted the $357 million net capex within its existing capital framework. Subject to concluding a gas supply agreement with the South Australian government.
Q3. What emissions reduction does the Project target?
Ans. The Moomba gas Project is targeting a reduction of approximately 40,000 tonnes of COâ‚‚ equivalent per year in Scope 1 emissions.
Q4. Where is the Moomba Gas Plant located?
Ans. The Moomba Gas Plant is located in the Cooper Basin in South Australia.
Disclaimer: This article is intended for informational purposes only and does not constitute financial or investment advice. All content is based on publicly available information. Investing in securities involves risk, including the possible loss of principal. Readers should conduct their own research and seek independent financial advice before making any investment decisions. Colitco does not hold any position in the companies mentioned.
Source:
Santos ASX Announcement:
ASX Share Price:
https://www.asx.com.au/markets/company/STO
