Australia and Indonesia Strengthen Offshore Decommissioning Collaboration Through Knowledge Exchange

CODA, in collaboration with the Department of Industry, Science and Resources (DISR) and the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA), recently delivered a two-day offshore oil and gas decommissioning workshop in Jakarta for Indonesian government officials and operators.

Held on 14–15 July 2026, the workshop brought together 40 participants to support knowledge exchange between Australian and Indonesian stakeholders and build capability in managing the challenges associated with offshore oil and gas decommissioning.

Australia and Indonesia share a common interest in effective offshore decommissioning outcomes, with both countries preparing for significant decommissioning activity in the coming decades. Building understanding between regulators and government officials provides an opportunity to share experiences, compare approaches and strengthen collaboration across the region.

The workshop was developed to provide participants with practical insights across the offshore decommissioning lifecycle, from regulatory frameworks and planning through to execution, environmental management and sustainability considerations.

Sessions covered a range of topics including international and Australian regulatory frameworks, Indonesia’s regulatory approach, well decommissioning, facility and subsea decommissioning, late-life asset management, platform reutilisation, cost estimation, hazardous materials management and environmental assessment.

The program also included contributions from Australian and Indonesian government representatives, including NOPSEMA, DISR’s Northern Endeavour branch, and Indonesia’s Ministry of Energy and Mineral Resources (ESDM), providing participants with perspectives from both jurisdictions.

Reflecting on the importance of collaboration in supporting future decommissioning outcomes, CODA CEO Dr Francis Norman said:

“Time and time again, we hear at industry conferences and forums that collaboration will be critical to addressing the challenges of offshore decommissioning. This workshop was a great example of that in practice, bringing together Australian and Indonesian stakeholders to share experiences, discuss different approaches and build a stronger understanding of the opportunities and challenges ahead.

“As countries across the region prepare for increasing decommissioning activity, continued knowledge exchange and cooperation will be an important part of supporting safe, sustainable and effective outcomes.”

As part of the broader capability-building initiative, CODA also developed a version of its recently released online well plug and abandonment training module, adding Bahasa Indonesia subtitles. The module provides an additional resource for Indonesian officials to continue building their understanding of key decommissioning concepts beyond the workshop.

Feedback from participants highlighted the value of sharing practical experiences and learning about different approaches to offshore decommissioning.

“This workshop provided an Australian decommissioning practice perspective in quite some detail, starting from legal and regulation, planning, cost estimation and execution. Thank you for the opportunity and new knowledge being shared.”

The workshop represents an important step in ongoing Australia–Indonesia collaboration on offshore decommissioning, supporting greater understanding of the technical, regulatory and operational considerations involved in managing offshore assets through their end-of-life phase.

CODA extends a huge thankyou to DISR, NOPSEMA, ESDM, and all participants involved in delivering this valuable knowledge exchange opportunity.

Major Milestones Reached in Harriet Alpha Decommissioning

CODA recently participated in a site visit to the Harriet Alpha assets following their arrival at the Australian Marine Complex (AMC) in Henderson, providing an opportunity to observe progress on the offshore removal and onshore dismantling phases of the project.

The visit brought together representatives from CODA, Santos, Liberty Industrial, McDermott, and the Department of Energy and Economic Diversification. Attendees were provided with a detailed walkthrough of the offshore removal and onshore dismantling workflow, including load-in operations and the transfer of large structural components from barge to self-propelled modular transporters (SPMTs) for positioning within the laydown area.

Harriet Alpha, installed in 1985 and ceasing production in 2013, was a pioneering development in Western Australia’s offshore oil and gas industry and forms part of a broader decommissioning program across the region. Liberty Industrial was engaged by Santos to undertake a deconstruction and disposal study for the Harriet Alpha platform. Following the award of the engineering, procurement, removal and disposal (EPRD) scope to McDermott in 2024, Liberty Industrial partnered with McDermott in 2025 to deliver the safe receival, demolition, recycling and disposal activities of the retired platform, including the helideck, topsides, jacket and associated equipment.

With major components including the jacket, topsides and the “Pancake 4” section weighing approximately 1,480 tonnes, 1,440 tonnes and 185 tonnes respectively, the project achieved multiple milestones, including being the largest offshore platform removed from Australian waters at the time.

The Harriet Alpha decommissioning scope represents a significant example of the growing capability of the Australian offshore decommissioning sector. It sets a new benchmark for scale and execution, and reflects the progression toward a growing number of large-scale decommissioning programs across the industry.

CODA acknowledges and congratulates all project teams involved in delivering this stage of the work.