UK ENERGY LAW AND ELECTRICITY SYSTEM – INFRASTRUCTURE INVESTMENT COORDINATION AND NATIONAL PLANNING

1. Introduction

Infrastructure investment coordination concerns the legal mechanisms through which the UK plans, authorises and finances generation, transmission, distribution, storage and interconnection infrastructure. The traditional model was largely project-by-project. The contemporary framework increasingly adopts a system-wide, anticipatory and spatial approach, recognising that offshore wind, nuclear, batteries, hydrogen, interconnectors and electrification require coordinated network investment.

The Energy Act 2023 established the statutory architecture for the Independent System Operator and Planner (ISOP), whose functions include coordinating electricity flows and undertaking strategic planning and forecasting for transmission development and electricity-system arrangements. This institutional framework now operates through the National Energy System Operator (NESO).

2. National Strategic Planning

A major development is the move toward the Strategic Spatial Energy Plan (SSEP). Government commissioned NESO to produce the first GB-wide SSEP covering electricity generation and storage and hydrogen assets. The objective is to provide a coordinated spatial blueprint for infrastructure rather than allowing generation and network decisions to develop independently.

Government policy envisages the SSEP identifying appropriate locations for generation and infrastructure, while the Centralised Strategic Network Plan (CSNP) translates those strategic requirements into long-term network planning. Ofgem directed NESO in April 2026 to submit the first CSNP for approval by September 2028 and publish it by December 2028.

3. Planning Act 2008 and NSIPs

Large energy projects may constitute Nationally Significant Infrastructure Projects (NSIPs) under the Planning Act 2008. Development consent is obtained through the Development Consent Order (DCO) regime.

National Policy Statements (NPSs) are central to this process. Under section 104, where an applicable NPS has effect, the Secretary of State must generally decide the application in accordance with that NPS, subject to statutory exceptions. The updated EN-1 (2025) and EN-5 (2025) came into force on 6 January 2026 and provide the current national framework for energy infrastructure and electricity-network NSIPs in England and Wales.

4. Investment Coordination and Grid Connections

Investment coordination is increasingly connected with grid-connection reform. Historically, connection queues could allow projects with uncertain development prospects to occupy capacity while strategically important projects waited.

The Planning and Infrastructure Act 2025 introduced mechanisms enabling strategic plans to influence transmission connections and requiring electricity distributors to have regard to designated strategic plans when exercising connection duties. This creates a stronger relationship between national planning objectives and individual connection decisions.

The regulatory challenge is therefore to coordinate where infrastructure is built, when networks are reinforced, which projects receive connection capacity, and how investment costs are allocated.

5. Case Law – ClientEarth v Secretary of State for BEIS [2021] EWCA Civ 43

Case Name/Citation: R (ClientEarth) v Secretary of State for Business, Energy and Industrial Strategy [2021] EWCA Civ 43.

Facts: ClientEarth challenged the Government's decision to grant development consent for new gas-generation infrastructure at Drax.

Legal Issue: The case concerned the interpretation and legal effect of energy National Policy Statements in determining an NSIP application.

Judgment: The Court of Appeal rejected the challenge.

Legal Principle/Ratio: National Policy Statements establish the policy framework within which individual development-consent decisions must be made; the court must distinguish legal requirements from matters entrusted to the decision-maker's planning judgment.

Significance: The case demonstrates how national energy policy structures constrain and guide individual infrastructure approvals.

6. Case Law – Together Against Sizewell C Ltd v Secretary of State [2023] EWCA Civ 1517

Case Name/Citation: R (Together Against Sizewell C Ltd) v Secretary of State for Energy Security and Net Zero [2023] EWCA Civ 1517.

Facts: The challenge concerned development consent for the Sizewell C nuclear project.

Legal Issue: The Court considered the statutory framework governing NPSs, development consent and environmental assessment.

Judgment: The Court of Appeal upheld the relevant decision-making approach.

Legal Principle/Ratio: Under the Planning Act 2008, an applicable NPS has substantial legal significance in determining an NSIP application, subject to statutory exceptions and environmental requirements.

Significance: The decision illustrates the legal importance of national planning frameworks for long-term electricity-generation investment.

7. Case Law – Boswell v Secretary of State for Energy Security and Net Zero [2025] EWCA Civ 669

Case Name/Citation: R (Boswell) v Secretary of State for Energy Security and Net Zero [2025] EWCA Civ 669.

Facts: The litigation concerned a challenge to an energy infrastructure consent decision and the treatment of the applicable NPS framework.

Legal Issue: Whether the Secretary of State had lawfully applied the statutory planning framework and provided adequate reasons.

Judgment: The Court of Appeal considered the statutory requirements governing NPSs and the Secretary of State's decision-making obligations.

Legal Principle/Ratio: Strategic energy policy does not remove the obligation to give legally adequate reasons or comply with statutory planning requirements.

Significance: It reinforces judicial oversight of national infrastructure decisions.

8. Conclusion

UK electricity infrastructure law is moving toward integrated national planning rather than isolated project approval. NESO's strategic-planning role, the SSEP, CSNP, updated energy NPSs and connection reforms increasingly connect generation, networks, storage and hydrogen infrastructure.

The central legal challenge is coordinating investment certainty, affordability, environmental protection, grid capacity, energy security and democratic planning while retaining lawful ministerial and regulatory accountability.