Australia's offshore oil and gas sector is entering a critical phase of decommissioning, as ageing infrastructure in regions like the Bass Strait and Western Australia reaches the end of its productive life.
With maturing fields driving activity, the industry faces substantial challenges in safely removing platforms, pipelines, and wells while minimising environmental impact and ensuring financial accountability.
Recent analysis by global energy consultancy Xodus, commissioned by the Australian Government, estimates the total decommissioning liability in Commonwealth waters at AUD43.6bn through 2070, or AUD66.8bn when adjusted for inflation.
This figure represents a significant reduction from the 2020 estimate of AUD61.8bn, attributed to improved efficiencies and better understanding of decommissioning processes.
The scope encompasses over 700 wells, 7,600 km of pipelines, and 520 subsea structures, with approximately 55% of the work anticipated before 2040.
Separately, the Centre of Decommissioning Australia (CODA) projects US$40bn in offshore activity over the next 50 years, emphasising well plugging and pipeline removal as primary costs.
Key projects illustrate progress. ExxonMobil Australia's Bass Strait programme, the nation's largest decommissioning effort, advanced significantly in 2025.
The team permanently sealed more than 200 wells and processed over 10,000 tonnes of steel and concrete for recycling or disposal.
Retired platforms have entered "stasis mode," secured and prepared for removal, with the Allseas Pioneering Spirit vessel scheduled to commence lifting operations in 2027.
Woodside Energy has also made strides in Western Australia.
Offshore decommissioning at the Enfield field, which began in 2022, is nearing completion.
While physical removal works are complete, post-decommissioning environmental obligations are still ongoing. According to Woodside, an annual report is scheduled for December 2026.
The Nganhurra Riser Turret Mooring was recovered in November 2023, and deconstruction achieved over 95% reuse or recycling by March 2024.
Ongoing work at the Griffin and Stybarrow fields includes the Griffin Riser Turret Mooring recovery in December 2024.
Government reforms are also bolstering the framework.
In November 2025, the Department of Industry, Science and Resources (DISR) released a consultation paper on enhancing decommissioning planning, financial assurance, and compliance tools.
Additionally, the Offshore Petroleum and Greenhouse Gas Storage (Resource Management and Administration) Regulations 2025 have been remade, effective from 31 March 2026, to improve resource management.
As Australia transitions towards net-zero goals, these efforts underscore a commitment to responsible decommissioning, balancing economic realities with environmental stewardship. Industry collaboration, as highlighted in reflections on 2025's landscape, will be pivotal in navigating the ramp-up to 2027 and beyond.
Wood has secured a two-year contract extension with Woodside Energy for the continued deliverance of brownfield engineering, procurement and construction management services across its offshore assets at the North West Shelf Project.
Under the contract, which is worth up to US$65mn, Wood will deliver asset modifications to boost production, reliability and longevity across Woodside’s NWS offshore assets, including the North Rankin Complex and the Okha FPSO.
John Mtanios, President of Asia Pacific Operations at Wood, iterated, “This extension reflects the strength of our 35-year relationship with Woodside and the trust built through consistent performance and a shared drive for excellence. Since first securing this contract in 2013, our teams have developed deep knowledge of each assets and Woodside’s operational priorities. That insight enables us to go beyond safe, reliable operations – finding smarter ways to improve productivity, reduce costs and optimise performance.”
The NWS Project, located in Western Australia, is one of the largest LNG developments in the world and has supplied the region with affordable and reliable energy for decades.
One of Australia’s newest ships that could play a crucial role in the nation’s decommissioning effort has been christened.
Bhagwan Marine announced on 7 January, 2026 that it had named its newest vessel the 'Bhagwan Micah' at its Brisbane operational base — it is named in honour of the late Micah Kirk, a former member of the group's Melbourne team.
The company said the vessel is purpose-built for the energy transition and critical infrastructure sectors.
Formerly named ‘the Phoenix’, the Bhagwan Micah is a 38m state-of-the-art Stern Landing Vessel (SLV), designed for the exacting requirements of modern offshore energy and subsea operations, particularly oil and gas decommissioning, with the ability to work in shallow water environments, subsea inspection, maintenance and repair and defence logistics projects.
“This latest addition to our fleet marks another milestone in the company’s strategic growth as Australia’s leading provider of integrated marine solutions across offshore energy, subsea, ports and inshore logistics and defence sectors,” a Bhagwan Marine statement read.
“With a fleet now of over 100 vessels, Bhagwan Marine continues to position itself as the partner of choice for operators who demand proven reliability, technical excellence and low-risk project execution in complex marine environments.”
The vessel is secured under a five-year bareboat charter from BM Fleet, providing Bhagwan Marine with long-term control of a scarce, high-spec asset while maintaining capital flexibility for further fleet renewal.
“The Bhagwan Micah is not just another vessel – it is a strategic asset that reinforces Bhagwan Marine’s leadership in complex, high-consequence marine operations where safety, technical performance and environmental responsibility cannot be compromised,” the statement added.
Last August, in its 2025 results presentation, the company highlighted how it had grown its presence in the decommissioning sector.
It also highlighted future growth opportunities, citing “a substantial long-term pipeline of offshore oil and gas decommissioning projects” as well as potential work arising from ageing offshore assets requiring inspection, repair and maintenance.
Subsea decommissioning specialist Decom Engineering has provided an update on its work offshore Australia.
In a social media post titled “Live from the Seabed: TRACS-16 Performance in Australia” the company reveals action footage of its TRACS-16 tool performing live cutting operations on the seabed.
TRACS-16 (Twin Recovery & Cutting System) is the firm’s innovative modular tool that combines cutting, lifting and recovery, designed to cut and recover pipelines up to 20m long with diameters up to 16”, although custom sizes can also be engineered.
It is ideal for decommissioning operations, with the crane-deployable tool capable of recovering sections and returning them to the deck or relocating to a subsea basket.
In a video posted on LinkedIn, the company shows TRACS-16 at work, cutting away at an unspecified subsea decommissioning site offshore Australia.
“We are getting January off to a super start with some live offshore footage from our project in Australia,” the company stated in the post.
“Here is the TRACS-16 tool performing live cuts on the seabed. We are seriously happy with the performance of this new tool in our toolbox, delivering impressive results across the campaign.”
These results include its speed, with cycle times of as little as nine minutes, with individual cuts averaging as fast as four minutes and 30 seconds “with some ever faster,” it added.
It also cited the machinery’s durability, achieving 38 cuts per blade, “demonstrating the reliability of our proprietary cutting technology.”
The post added: “This level of efficiency is exactly how we help operators minimise vessel time and keep complex decommissioning projects on track.”
The TRAC 16’s quick connect system allows for seamless attachment and detachment of the C1-16 Chopsaw, which comes with a 1,040mm blade capable of making precise cuts through pipes up to 16″ in diameter.
It also includes ROV (remotely-operated vehicle) grab bars at both ends and near the hotstab panel, ensuring easy positioning and stabilisation by the ROV.
The system is operable via ROV or topside control package.
One of the key players working on Australia’s flagship Northern Endeavour decommissioning programme has been taken over by a former American rival.
US-based CB&I has entered into an agreement to acquire Petrofac’s Asset Solutions business after the parent company filed for administration in late 2025 due to financial distress from cost overruns and contract issues.
Petrofac was awarded its Northern Endeavour contract by the Australian government in April 2022, heralding the start of an era of decommissioning in the nation’s offshore oil and gas sector.
Petrofac’s Australia team, based in Perth, were contracted to complete Phase 1 of the decommissioning of the FPSO (Floating Production, Storage and Offtake) facility.
It is unclear at this point how the project will be affected, if at all, after the CB&I acquisition goes through, with approximately 3,000 Petrofac employees expected to join the Texas company at the close of the transaction, anticipated to occur in the first quarter of 2026.
According to Mark Butts, CB&I’s President and CEO, the acquisition will strengthen the group’s overall portfolio and enhance service capabilities.
He said it also supports CB&I’s diversification into integrated services, expands customer relationships and opens pathways for growth in international markets.
“Asset Solutions’ leadership demonstrates pride in operational excellence, commitment to customers, and resilience through challenging circumstances,” said Butts.
“Our organisations share similar management philosophies and industry-leading safety performance. With this combination we see strong cultural alignment, diversification benefits, and clear opportunities to enhance performance and deliver stable cash flow generation. These factors collectively support CB&I’s long-term growth objectives.”
Following the close of the transaction, CB&I will operate as one company with two global business units, CB&I Asset Solutions based in Aberdeen, Scotland, and CB&I’s existing operations, CB&I Storage Solutions, based in The Woodlands, Texas.
With thousands of jobs saved, it is hoped there will be minimal disruption to the Northern Endeavour work.
“We are excited about this opportunity to focus on our core strengths, reaffirm critical customer relationships, stabilise our supply base and deliver operational excellence for our current and future projects,” said John Pearson, Petrofac Asset Solutions Chief Operating Officer.
“We have the operational and engineering talent required to deliver high-value growth opportunities and expand differentiated services. Our cultural compatibility with CB&I enhances our integration and supports a smooth transition.”
Subsea7 has been awarded a contract with Chevron Australia for subsea installation on the Gorgon Stage 3 Project.
Subsea7’s scope of work includes project management, engineering, procurement, fabrication, transportation, installation and pre-commissioning of subsea equipment and associated infrastructure at the project site, located at 1,350m water depth.
Project management and engineering work will commence immediately, with offshore operations expected to begin in 2028.
David Bertin, Senior Vice President for Subsea7 Global Projects Centre East, said, “This project marks an important milestone and reinforces our long-term strategic engagement with Chevron. Building on our local and international capability and experience, we look forward to working collaboratively with Chevron Australia – focusing on safety and quality to optimise reliability, technical integrity and offshore operations – to successfully deliver the Gorgon Stage 3 subsea installation.”
ExxonMobil Australia Chair, Simon Younger, outlined the state of play in the company’s decommissioning efforts in the Gippsland Basin during a recent industry event.
He said the company is committed to “responsibly decommissioning” a number of offshore facilities that are no longer producing oil and gas, highlighting the global significance of the project off the coast of Victoria.
“You may be surprised to learn that Victoria is home to Australia’s largest decommissioning project, and ExxonMobil’s largest decommissioning project globally, a multi-year, multi-billion dollar programme of works,” he noted.
Younger was speaking at an event to mark ExxonMobil Australia’s 130 years in the country.
From humble beginnings as the Vacuum Oil Company (later known as Mobil Oil Australia) selling a barrel of cylinder oil to a Bendigo Goldmine from its Melbourne office back in 1895, 130 years later it has grown to become one of Australia’s most critical energy suppliers.
The event also celebrated 60 years of its membership to the Committee for Economic Development of Australia (CEDA), an independent, member-based public policy think tank.
“So far we’ve safely completed over $2.5 billion of early works across our offshore operations, including the permanent sealing of more than 200 wells,” said Younger.
All this work, he added, is in preparation for the arrival of the world’s largest construction vessel, the Allseas Pioneering Spirit, in 2027.
“This mammoth vessel, which is as long as almost 3 MCG fields laid end to end, will travel from Norway to start removal of the 12 retired offshore facilities in Bass Strait and deliver them to our Barry Beach Marine Terminal in Southeast Gippsland, where they will be safely dismantled and recycled.”
After that, the mega project entails a huge and coordinated recycling effort, he noted.
“We plan to maximise recycling of these facilities for a second life and minimise the number of materials processed as waste,” said Younger.
“In fact, our aim is to recycle more than 95% of the mostly steel material from our oil and gas structures. Most of the steel will either be sent offsite in trucks, or via ships for onward transportation to recycling facilities.”
At the same time, Younger noted that ExxonMobil Australia remains committed to supporting the reliable supply of gas from the Bass Strait into the 2030s.
Over the last decade, it has invested almost a billion dollars in the Gippsland Basin.
These investments include the Kipper 1B project, which started up last month, the Kipper Compression Project, and the West Barracouta project, which came online in 2021.
“And right now, in conjunction with our joint venture partner Woodside Energy, we are investing $350 million to develop the Turrum Phase 3 project, which will further bolster supplies of Gippsland gas to the east coast domestic market by 2027,” he said.
“Turrum Phase 3 will be one of the largest gas developments on the east coast and means our Gippsland operations are set to continue powering Australian homes and businesses well into the next decade.”
Australia faces a major offshore oil and gas decommissioning challenge, with costs estimated at US$40.5bn over the next 50 years, covering more than 1,000 wells as well as related infrastructure.
This is estimated by the Centre of Decommissioning Australia (CODA) to involve the dismantling and disposal of topsides and substructures equivalent to 75 Eiffel towers.
Recent guidance issued by the UK’s Net Zero Technology Centre, in partnership with engineering consultancy Astrima, could help energy companies globally speed up the rollout of improved technologies for decommissioning oil and gas wells, thereby helping to cut costs as well as reducing the environmental impact of ageing energy assets.
The Aberdeen-based centre said the current pace of deployment “remains incredibly slow” as the scale of the challenge grows.
The first guidance is focused specifically on well plug and abandonment (P&A), given that well abandonment is one of the most costly aspects of decommissioning.
It sets out a clear, evidence-based process to assess whether materials can safely and permanently seal wells that are no longer in use. The six-step framework supports safe and confident use through a structured qualification process, helping users identify risks, build a strong evidence base, and streamline approvals to accelerate the safe deployment of new solutions.
Long-term safety and environmental protection are critical as the industry moves away from traditional cement-based barriers. New technologies using low melting point alloys, resins, polymers and epoxies are emerging, but face challenges demonstrating their effectiveness and reliability.
The framework incorporates input from operators, regulators and technology developers, and draws on international guidelines and standards such as DNV RP A203 and API RP 17Q, which are widely used across the energy sector.
Lewis Harper, Programme Manager at NZTC, said,“Well decommissioning is an increasingly urgent global issue as maturing basins seek ways to cut costs, reduce emissions and improve efficiency. The only way to achieve that is through new technology, but the pace of developing and deploying new solutions remains incredibly slow.
“This guidance will help speed up the safe adoption of innovative technologies, giving operators and regulators the confidence to move faster. By managing performance to stringent standards, the adoption of new materials should become easier and more reliable. This framework gives the industry the tools to tackle well decommissioning challenges with greater confidence.”
Pentarch Offshore Solutions, which provides marine logistics for offshore energy, heavy industry and decommissioning, is bolstering its bunkering capabilities.
The company, a partner of the Centre of Decommissioning Australia (Coda), has signed a Memorandum of Understanding (MoU) with Integr8 Fuels to help meet growing Australian maritime refuelling needs at the Port of Edrom, Eden, New South Wales (NSW).
The agreement marks a key step in enhancing bunker fuel provision and operational support for expanding offshore energy, maritime, and defence activities in the region, according to William Kanavan, Managing Director of Pentarch Offshore Solutions.
“The signing of this MOU marks a significant milestone for Pentarch Offshore Solutions, firmly positioning our region on the global map as a growing hub for marine and offshore energy operations,” said Kanavan.
“Our developing partnership with a world-leading fuel provider like Integr8 Fuels demonstrates the scale of opportunity this regional port can deliver – for industry, and for Australia.”
The collaboration means the two partners, alongside regional stakeholders, will be contributing to the ongoing transformation of the Port of Edrom into a multi-functional marine and energy terminal.
The MOU builds on existing fuel supply commitments to a range of Australian and international marine contractors, including allied defence and naval refuelling operations.
“This partnership strengthens Integr8 Fuels’ presence in the Australian market, demonstrating our commitment to supporting critical marine and offshore operations,” said Christopher Seidel, Integr8 Fuels’ Business Manager.
“We look forward to collaborating with Pentarch Offshore Solutions and contributing to the growth and capability of the Port of Edrom and the Far South Coast community of New South Wales.”
The Australian Government Department of Industry, Science and Resources has published a consultation paper seeking feedback on reforms to decommissioning and financial assurance arrangements for the offshore oil and gas industry
Australia has up to US$60bn of offshore oil and gas decommissioning activities expected to occur over the next 30 to 50 years. Previous reforms have strengthened the offshore petroleum decommissioning regulatory framework. However, there are aspects that may require further reform to ensure industry is undertaking timely, safe and environmentally responsible decommissioning.
While the paper focuses mainly on oil and gas projects, it is also seeking input on the regulatory regime for decommissioning carbon capture and storage projects.
The proposed reforms aim to strengthen the decommissioning framework so industry:
• decommissions in a timely, safe and environmentally responsible way
• remains responsible for the risks and liabilities of offshore activities.
The consultation paper invites feedback on:
• the existing decommissioning framework in Australia
• lessons from international and onshore frameworks
• proposed areas for reform, including:
• decommissioning planning
• financial planning and assurance
• decommissioning and financial capacity risk assessments
• compliance and enforcement tools
• title surrender.
Feedback to the consultation paper is now open and will close on 13 January 2026. Feedback to this consultation will help the government develop these reforms and may also inform related activities.
There will be future public consultation informed by the responses to this paper, and the government will also consult on any legislative changes.
To read the consultation paper and provide feedback please visit www.consult.industry.gov.au.
Kimberley Marine Support Base (KMSB), a new purpose-built floating wharf in Broome, is looking to aid Western Australia’s (WA) oil and gas decommissioning efforts.
The facility enables 24/7 operations independent of tides, a significant advantage in northern Australia, where tidal windows can create unpredictable delays and added costs.
KMSB marks another significant private investment in the state’s critical port infrastructure steered by Founder and Managing Director Andrew Natta — building on the successful model he established at the existing Onslow Marine Support Base (OMSB) in the Pilbara region of WA.
OMSB is an industry partner of the Centre of Decommissioning Australia (CODA), which highlighted the new project in its recent newsletter.
The new facility boasts a 300-metre berth and heavy-lift capability, and is designed to accommodate breakbulk and project cargo up to 600 tonnes, as well as roll-on roll-off (RoRo) equipment for the resource and defence sectors, and containerised freight, critical minerals, renewable energy infrastructure and decommissioning equipment.
The KMSB facility is designed to operate as a complementary terminal to the Port of Broome, which has served as the region’s main maritime logistics hub for more than 80 years.
Australia’s northwest has long grappled with infrastructure bottlenecks, such as vessels waiting on tides, delayed project cargo, and escalating costs from demurrage and congestion —operational constraints that all carry economic implications.
Broome, in particular, has been a critical hub supporting offshore oil and gas, community resupply, defence readiness and emerging renewable energy projects.
Yet, despite this strategic importance, limitations in port infrastructure have repeatedly challenged shipping schedules and project timelines.
“Our floating wharf at KMSB is designed for ‘non-tide dependant’ operations – removing the bottlenecks that have long-plagued supply chains within the region,” said Natta.
He said KMSB will boost productivity, safety and reduce costs for established Kimberley businesses in the agricultural and resources sectors, while also allowing cruise ships to come alongside for passengers to visit Broome without the need to wait for appropriate tides.
Crucially, the facility will also enable the growth of new sectors – such as proposed critical minerals and renewable energy developments – by providing the necessary infrastructure for handling specialised cargo like wind turbines, solar systems and commercial battery imports.
“Our 24/7 operational capability, combined with our flexible, client-focused approach, means businesses can now plan with confidence, operate cost effectively and significantly improve their supply chain efficiency.”
Improved efficiencies and experience may help to ease the cost of decommissioning Australia’s ageing offshore oil and gas infrastructure, a new report suggests.
The Department of Industry, Science, and Resources recently commissioned consultancy, Xodus Group, to explore the nation's overall decommissioning liabilities.
The report — Australian Offshore Oil & Gas Decommissioning Liability Estimate 2025 — estimates the industry will spend A$43.6bn through to 2070, rising to A$66.8bn when factoring in inflation.
This includes all fixed and floating facilities, rigid and flexible lines, subsea infrastructure and wells.
It added that around 55% of the decommissioning spend will occur before 2040, with 61% of the liability focused on Western Australia, 23% in Victoria and 16% off the Northern Territory.
The decommissioning of wells represents the single largest portion of the decommissioning liability, with an estimated cost of A$17.9bn, the report added, followed closely by pipeline decommissioning, with an estimated liability of A$17.85bn.
The report noted that decommissioning practice and technology have already improved since 2020, a trend that could continue, yielding benefits along the way.
There is an opportunity for further improvements in efficiency, it added, through operator cooperation when decommissioning, in addition to further technological advances and industry investment in onshore disposal and recycling.
“Possible cost reductions primarily relate to the opportunity for efficiencies, technological development and future infrastructure investments,” it stated.
These include:
Single and multiple operator campaigns to distribute the costs of equipment and vessels across multiple assets.
A dedicated disposal yard for deconstruction and cleaning.
Domestic steel recycling to reduce the amount of steel which is exported for recycling.
Aligning decommissioning campaigns with offshore wind construction to reduce vessel mobilisation rates.
Implementing new technologies and/or engineering practices to ensure that the most appropriate and efficient methodology, vessels, and equipment are used to perform decommissioning activities. Here, it cites the example of changes in the commonly accepted removal methodologies for certain infrastructure types.For example, reverse s-lay was previously considered the only methodology for recovery of pipelines — however, cut and lift now remains the most accepted method for pipeline removal.
Other findings in the report highlight the sheer magnitude of the task now facing contractors and operators across the board, with at least 2.7 million tonnes of infrastructure set to be removed, including a large portion of steel, with huge potential for local recycling.
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