OIL AND GAS INFRASTRUCTURE REPURPOSING LAW FOR RENEWABLES

1. Introduction

Oil and gas infrastructure repurposing refers to converting existing offshore platforms, pipelines, subsea facilities, ports and associated infrastructure from petroleum-related uses to support renewable electricity, offshore wind, hydrogen, carbon capture and storage (CCS), or other low-carbon energy activities. In the United Kingdom, there is no single statute creating a comprehensive “oil and gas-to-renewables repurposing” regime. Instead, repurposing is governed through an interaction of the Petroleum Act 1998, Energy Act 2004, Energy Act 2008, Energy Act 2023, Planning Act 2008, marine licensing legislation, environmental regulation and NSTA/OPRED functions. The Government and NSTA increasingly recognise reuse as an alternative to immediate decommissioning.

2. Petroleum Act 1998 and Decommissioning

The Petroleum Act 1998 establishes the principal offshore oil and gas decommissioning framework. Normally, when petroleum infrastructure reaches the end of its productive life, operators must prepare an abandonment/decommissioning programme. However, the NSTA has a statutory role in considering alternatives to abandonment or decommissioning, including reuse, when advising on decommissioning programmes.

Therefore, repurposing can potentially avoid unnecessary removal of useful infrastructure where continued use is technically, environmentally and legally appropriate.

3. Energy Transition and NSTA Powers

The Energy Act 2023 strengthens the legal architecture for the North Sea transition. It supports development of hydrogen, carbon capture and storage and other low-carbon technologies, while maintaining the offshore oil and gas environmental and decommissioning regime.

The NSTA's recent Asset Transition Process is particularly relevant. It is intended to encourage earlier identification of alternatives to decommissioning, including repurposing, and to coordinate asset transition with cessation-of-production decisions. The NSTA identifies the HyNet project in Liverpool Bay as an example where infrastructure was repurposed for CCS while other assets proceeded toward decommissioning.

4. Conversion for Renewable Energy

Repurposing an oil platform for offshore wind or another renewable-energy function does not automatically transfer its original petroleum permissions. A new legal assessment may be required concerning:

• marine licensing;
• planning and development consent;
• electricity-generation or transmission authorisation;
• environmental assessment;
• seabed rights;
• navigation and safety;
• structural integrity;
• ownership and liability;
• decommissioning obligations; and
• regulatory responsibility after conversion.

Where renewable electricity infrastructure forms part of a nationally significant project, the Planning Act 2008 Development Consent Order regime may become important. The courts have recognised that large offshore renewable projects require careful assessment of their offshore and associated infrastructure.

5. Environmental and Safety Duties

Repurposing cannot be justified merely because it reduces decommissioning costs. The continued use of ageing platforms and pipelines must satisfy applicable environmental, structural and safety standards. Appropriate assessment and marine environmental requirements may apply where protected habitats or species could be affected.

The recent Oceana UK litigation demonstrates the importance of rigorous environmental assessment in offshore petroleum decision-making. Although the case concerned petroleum licensing rather than renewable repurposing, its reasoning illustrates the legal significance of protected marine sites and appropriate assessment in the offshore regulatory system.

6. Case Law

Case: Apache UK Investment Ltd v Esso Exploration and Production UK Ltd [2021] EWHC 1283 (Comm)

Facts: The dispute concerned contractual allocation of potential decommissioning liabilities under the Petroleum Act 1998, including obligations relating to offshore wells.

Legal Issue: The court considered the scope of statutory abandonment obligations and their relationship with contractual arrangements.

Judgment: The High Court interpreted the statutory framework and contractual definitions concerning decommissioning liability.

Legal Principle: Offshore infrastructure cannot be treated as free from statutory decommissioning consequences merely because ownership or contractual responsibility changes.

Significance: This is important for repurposing transactions because parties must clearly allocate existing and future decommissioning liabilities before infrastructure is transferred to a renewable-energy project.

Case: R (Substation Action Save East Suffolk Ltd) v Secretary of State [2022] EWHC 3177 (Admin)

Facts: The challenge concerned Development Consent Orders for major offshore wind projects and associated infrastructure.

Legal Issue: Whether the Secretary of State had lawfully assessed relevant planning and environmental considerations.

Principle: Large renewable infrastructure projects must comply with the statutory planning framework and properly consider relevant environmental and infrastructure impacts.

Significance: The case illustrates the regulatory scrutiny that repurposed oil-and-gas infrastructure may face when incorporated into major renewable-energy developments.

7. Conclusion

UK law is moving toward an asset-transition model in which suitable oil and gas infrastructure can potentially be retained and repurposed rather than automatically removed. However, repurposing remains case-specific. The decisive legal questions concern safety, environmental protection, technical suitability, ownership, regulatory consent and allocation of decommissioning liabilities. The developing NSTA Asset Transition Process and the Energy Act 2023 demonstrate an increasingly integrated legal approach to converting the North Sea from a predominantly petroleum-based system into a multi-energy offshore infrastructure network.