Centre of Decommissioning Australia (CODA) posted an updated on its website on 1 May, 2026 highlighting progress on the Harriet Alpha assets following their arrival at the Australian Marine Complex (AMC) in Henderson.
A site visit provided an opportunity for CODA officials to observe progress on the offshore removal and onshore dismantling phases of the project.Representatives from CODA, Santos, Liberty Industrial, McDermott and the Department of Energy and Economic Diversification were all present at the visit.
“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,” the CODA update noted.
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 programme across the region.
Liberty Industrial was engaged by Santos to undertake a deconstruction and disposal study for the Harriet Alpha platform, with McDermott awarded the engineering, procurement, removal and disposal (EPRD) work in 2024.
In 2025, Liberty Industrial partnered with McDermott to deliver the safe demolition, recycling and disposal activities for 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 has achieved multiple milestones, CODA noted, including being the largest offshore platform removed from Australian waters at the time.
CODA added that it “acknowledges and congratulates” all project teams involved in delivering the work.
“The Harriet Alpha decommissioning scope represents a significant example of the growing capability of the Australian offshore decommissioning sector,” it noted.
“It sets a new benchmark for scale and execution, and reflects the progression toward a growing number of large-scale decommissioning programmes across the industry.”
