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Jurisdiction(s):
United Kingdom
United Kingdom
Key definition
Decommissioning definition What does Decommissioning mean? Decommissioning describes the end‑of‑life phase of an energy or industrial installation: the managed cessation of operations, making safe, plugging and abandonment (for wells), dismantling and removal of plant, equipment and materials, waste management, and environmental remediation and restoration of the site. It is a descriptive expression used across multiple regimes, but in key sectors it is governed by statute, licences and consents. In the UK, offshore oil and gas decommissioning is regulated under the Petroleum Act 1998 (requiring an approved decommissioning programme and imposing continuing liabilities). Offshore renewables and pipelines are covered by the Energy Act 2004. Nuclear decommissioning...
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UK offshore oil and gas decommissioning disputes: Section 29 notices and challenges, decommissioning programmes, decommissioning security agreements, expert determination, contractor risk allocation and legacy liabilities
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Practice notes
Scope
The UK’s Decommissioning framework spans offshore oil and gas installations and offshore submarine oil and gas pipelines. It gives effect to the UK’s obligations under the 1992 Convention for the Protection of the Marine Environment of the North East Atlantic (OSPAR), and also implements duties under the 1982 UN Convention on the Law of the Sea. For further detail on UK government policy on decommissioning and the underpinning international law, see Practice Note: Decommissioning—International Law and UK Government Policy.
In May 2021, the North Sea Transition Authority (NSTA) (formerly known as the Oil & Gas Authority) released its Decommissioning Strategy to drive cost efficiencies across decommissioning and to articulate its view that decommissioning should aid the energy transition. This can be achieved by assessing decommissioning alongside potential re-purposing of wells and structures (for example, for carbon capture and storage, or for future hydrogen use). The deployment of technology is likewise expected to enable cost-efficient decommissioning.
As a default under international law, disused installations or pipelines must be removed completely, meaning they are to be taken back to land for reuse or for appropriate disposal...
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Web page updated on 22/05/2026
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