Australia’s oil and gas decommissioning regulations are complex, to say the least. You only need to look at this overview of legislation, policies, and guidelines governing operations in Commonwealth waters to get a sense – and note that it’s not an exhaustive list.
(Source: NOPSEMA)
While it’s easy to get tangled in this web of legislation and guidelines, the reality is that we need workable decommissioning strategies.
Australia faces a $60 billion decommissioning challenge in the coming decades, with much of the work concentrated off the Western Australian coast. At the same time, global shifts in areas like ESG investing and technology-enabled operations, as well as legislative and policy reforms in Australia, put oil and gas decommissioning squarely at the intersection of environmental responsibility and economic opportunity.
As Australia’s leading oil and gas decommissioning partner, C.D. Dodd helps operators balance stringent regulatory compliance with incentives designed to spark growth in sustainable industries. That starts with understanding the practical implications of a complicated regulatory landscape.
Delving Deeper Into Australia’s Oil and Gas Decommissioning Regulations
We can drill down on key stakeholders to understand their impact on planning and operations. This provides a practical framework for compliance. It’s not exhaustive – but it’s a start to understanding operators’ obligations.
Legislation Affecting Oil and Gas Decommissioning
The primary pieces of legislation that impact decommissioning projects include:
- Offshore Petroleum and Greenhouse Gas Storage Act 2006 (OPGGS Act): Governs offshore petroleum operations, safety, environment, and decommissioning.
- Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations 2023 (OPGGS E): Detail operational and environmental requirements under the OPGGS Act.
- WA Environmental Protection Act 1986 (EPA): Governs environmental protection and pollution control in Western Australia.
- Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act): Protects nationally significant environmental and biodiversity values.
Other legislation, such as the Sea Dumping Act and RMA Regulations, addresses specific aspects of decommissioning. However, these are the ‘big four’ of oil and gas decommissioning regulations enforced by regulatory bodies.
NOPSEMA
NOPSEMA (the National Offshore Petroleum Safety and Environmental Management Authority) is Australia’s federal regulator overseeing offshore oil and gas safety, environmental management, and well integrity in Commonwealth waters.
It ensures operators meet strict safety and environmental standards, approves decommissioning plans, monitors compliance, and can direct operators to remove or remediate infrastructure. NOPSEMA also assesses alternative decommissioning proposals, such as rig-to-reef strategies.
In short, NOPSEMA is the go-to regulator for offshore decommissioning compliance.
DMIRS
The WA Department of Mines, Industry Regulation and Safety, or DMIRS, is the state regulator overseeing oil and gas activities onshore, and offshore in Western Australian waters.
It sets guidelines for safe well plugging, site rehabilitation, and environmental protection, requiring operators to submit detailed decommissioning plans and coordinate with other state agencies to meet closure and lease surrender obligations.
In practice, WA operators work closely with DMIRS when plugging onshore wells, clearing and revegetating sites, and proving that all obligations are met to the Minister’s satisfaction.
DCEEW
The federal Department of Climate Change, Energy, the Environment and Water (DCCEEW) oversees environmental and policy aspects of decommissioning.
It manages the Environment Protection (Sea Dumping) Act 1981, granting necessary permits for offshore structure abandonment and leads policy development on trailing liabilities and national guidelines, coordinating closely with NOPSEMA.
While NOPSEMA and DMIRS oversee day-to-day compliance, DCCEEW sets the broader environmental rules of the game and grants special permissions.
Putting Regulations Into Practice: Critical Decommissioning Tasks and Compliance Requirements
What do all these regulations and requirements mean for operators? There are several key obligations that apply to all oil and gas decommissioning projects, with a focus on proactive planning and environmental responsibility throughout the asset’s lifecycle.
Well Plugging and Abandonment
All wells should be plugged and abandoned, usually within 2 to 3 years after production ceases, according to NOPSEMA’s latest decommissioning compliance strategy.
Every production, injection, or exploration well must be plugged with cement and mechanical barriers to prevent leaks.
Regulators treat well abandonment very seriously. Operators must follow approved Well Operations Management Plans and industry best practices, including submitting abandonment reports.
If NOPSEMA isn’t satisfied that plugs and seals are holding and the well is permanently safe, they could issue directions or penalties.
Removing Offshore Structures and Equipment
Australia’s default rule is the full removal of all platforms, rigs, subsea structures, pipelines, and other equipment that were installed for the operation.
Practically, this means planning for heavy-lift campaigns to:
- Topple and transport offshore platforms
- Cut and retrieve subsea wellheads and pipelines
- Remove any other seabed installations
In rare cases, an operator might seek an exception to leave part of an installation in situ. For example, a steel jacket that can become an artificial reef, or deep pipeline segments that pose minimal risk.
Deviations from full removal must clear very high bars. Titleholders must convince NOPSEMA that in-situ abandonment delivers equal or better environmental, safety, and integrity outcomes than removing it, and obtain a Sea Dumping Act permit from DCCEEW.
Handling Hazardous Materials and Waste
C.D. Dodd’s specialty in hazardous waste disposal and scrap metal recycling ensures that steel from a dismantled structure is sustainably recycled rather than simply dumped.
Decommissioning often uncovers environmental hazards that must be managed and disposed of safely. This includes hydrocarbon-contaminated materials, drilling fluids, and asbestos in older facilities – not to mention tonnes of steel.
Operators should document all waste handling and scrap metal recycling efforts. Regulators (especially DCCEEW and DMIRS) will want evidence that material disposal methods aren’t causing environmental harm.
Site Rehabilitation and Post-Decommissioning Monitoring
The job isn’t over after the heavy lift and removal work is done. Environmental restoration is a legal requirement in oil and gas decommissioning.
Both DMIRS and NOPSEMA expect operators to set rehabilitation criteria, such as water quality levels, habitat restoration metrics, and biodiversity indicators. Meeting these milestones requires monitoring and rehabilitation post-decommissioning.
Offshore, this might involve debris trawls or surveying the seabed to ensure no equipment, debris, or obstructions remain. Onshore, it involves removing contaminated soil, re-contouring land, replacing topsoil, and replanting native vegetation.
It’s the operator’s responsibility to report monitoring results and address any issues that arise. Planning for this phase is important so that nothing is left to chance – or left behind.
How C.D. Dodd Helps WA Oil and Gas Companies Stay Compliant
End-to-End Regulatory Consulting for Oil and Gas Decommissioning
C.D. Dodd provides comprehensive regulatory consulting services to navigate the complex permitting landscape. We ensure all documentation and approvals are in place before projects start, conduct detailed compliance assessments, and prepare tailored plans to meet NOPSEMA and DMIRS requirements.
Sustainable and Cost-Effective Asset Disposal
As a leader in scrap metal recycling and contaminated material disposal, C.D. Dodd leverages over 50 years of experience to deliver sustainable and cost-effective solutions. Our techniques and technology maximise asset value while minimising environmental impact.
We are also exploring innovative repurposing strategies to transform offshore structures, aligning with circular economy principles and sustainability goals.
Environmental Compliance and Risk Mitigation Strategies
Our environmental compliance strategies include meticulous well abandonment and pipeline removal practices that strictly adhere to regulatory and environmental standards. Using specialised hazardous material containment, management, and disposal solutions, we safeguard ecosystems while maintaining operational safety.
This support extends to comprehensive post-decommissioning monitoring services. We help operators achieve full regulatory sign-off and maintain environmental recovery over the long-term.
Contact C.D. Dodd to learn more about our comprehensive oil and gas decommissioning support, including regulatory guidance and practical solutions built on 50 years of experience.