NATIONAL INFRASTRUCTURE PLANNING REGIME (NSIP PROCESS)

1. Introduction

The Nationally Significant Infrastructure Projects (NSIP) regime is the United Kingdom’s specialised planning and consenting framework for major infrastructure considered nationally important. Its principal statutory foundation is the Planning Act 2008. The regime was designed as a coordinated “one-stop” consenting system, replacing lengthy and fragmented approval procedures for major projects. It covers infrastructure such as major energy generation and transmission projects, highways, railways, airports, reservoirs, water infrastructure and waste facilities.

The regime is particularly important to energy law because major electricity generation, renewable-energy and network projects may require a Development Consent Order (DCO) rather than ordinary planning permission.

2. National Policy Statements

A central feature is the National Policy Statement (NPS). An NPS establishes government policy concerning the need for particular categories of nationally significant infrastructure and provides the principal policy framework against which individual DCO applications are assessed.

Under the Planning Act 2008, proposed NPSs are subject to parliamentary scrutiny. Importantly, an NPS does not itself authorise construction. A promoter must still obtain development consent for an NSIP.

The Planning and Infrastructure Act 2025 has further reformed this framework, including a requirement designed to ensure full reviews and updates of NPSs at least every five years.

3. Development Consent Order Process

Under section 31 of the Planning Act 2008, development consent is required where development constitutes or forms part of an NSIP. The DCO procedure broadly involves project preparation, consultation, application, acceptance, examination, recommendation and final determination.

Historically, the pre-application stage placed substantial emphasis on consultation with relevant authorities, affected communities and other statutory consultees. Consultation responses had to be considered, and the application was accompanied by relevant consultation documentation.

After acceptance, an Examining Authority, generally operating through the Planning Inspectorate framework, examines the application. Interested parties may submit representations, while relevant local authorities can provide Local Impact Reports. The examination considers environmental effects, compulsory acquisition, alternatives, mitigation, local impacts and compliance with applicable national policy.

The Examining Authority then reports its findings and recommendation, while the relevant Secretary of State ultimately determines whether development consent should be granted.

4. Environmental and Public-Law Controls

The NSIP regime operates alongside environmental law, including environmental assessment requirements, habitats protection and climate-related statutory obligations. Decisions are also governed by ordinary public-law principles, meaning unlawful procedure, failure to consider legally relevant matters, or other reviewable errors can expose NPSs and DCO decisions to judicial review.

Recent reforms under the Planning and Infrastructure Act 2025 address matters including examinations, DCO changes and legal challenges, demonstrating that the NSIP framework continues to evolve.

5. Case Law – R (Friends of the Earth Ltd) v Heathrow Airport Ltd [2020] UKSC 52

Facts: The Government designated the Airports National Policy Statement, supporting a third runway at Heathrow. Environmental organisations challenged the NPS, arguing, among other matters, that the Government had failed properly to account for commitments associated with the Paris Agreement.

Legal Issue: Whether the designation of the Airports NPS was unlawful because of the treatment of climate-change commitments.

Judgment: The Supreme Court unanimously allowed Heathrow Airport Ltd’s appeal and rejected the conclusion that the NPS was unlawful on the relevant ground.

Legal Principle/Ratio Decidendi: The case illustrates that an NPS establishes the policy framework, rather than granting development consent for the project itself. Environmental and climate issues may therefore arise both at the strategic policy stage and later when a particular DCO application is considered.

Significance: The judgment demonstrates the relationship between national infrastructure policy, environmental obligations and judicial review within the Planning Act regime.

6. Case Law – R (Spurrier) v Secretary of State for Transport [2019] EWHC 1070 (Admin)

Facts: Claimants challenged the Government’s designation of the Airports NPS supporting Heathrow expansion.

Legal Issue: The proceedings concerned whether the Secretary of State had acted unlawfully in adopting the national policy framework for airport expansion.

Judgment: The Divisional Court dismissed the challenges before it.

Legal Principle/Ratio Decidendi: Courts review the lawfulness of the decision-making process, rather than simply substituting their own assessment of infrastructure policy.

Significance: The case demonstrates the important distinction between governmental infrastructure-policy choices and judicial supervision of their statutory legality.

7. Conclusion

The NSIP regime provides a centralised legal framework for nationally important infrastructure. Through NPSs, DCOs, environmental assessment, examination, public participation and ministerial decision-making, the Planning Act 2008 seeks to combine infrastructure delivery with procedural fairness and environmental protection. Judicial review remains an essential mechanism for ensuring that national infrastructure decisions remain within statutory and public-law boundaries.