NATIONAL STRATEGY FOR ELECTRICITY RESILIENCE

1. Introduction

A National Strategy for Electricity Resilience is the legal, regulatory and operational framework through which the United Kingdom seeks to ensure that its electricity system can prevent, withstand, respond to and recover from major disruptions. Electricity resilience extends beyond ordinary security of supply. It includes protection against extreme weather, equipment failure, cyberattacks, physical sabotage, supply-chain disruption and cascading failures across other critical infrastructure.

As of September 2026, the UK Government is developing a dedicated Energy Resilience Strategy, following the 2025 North Hyde substation outage and the subsequent review by the National Energy System Operator (NESO). The strategy is intended to address prevention, preparedness, response and recovery across the energy system.

2. Legal and Regulatory Framework

Electricity resilience operates through several overlapping legal instruments. The Electricity Act 1989 provides the fundamental statutory structure governing electricity generation, transmission, distribution and supply. The Energy Act 2004 additionally requires government and Ofgem to report to Parliament on security of supply. The 2025 statutory report assesses whether electricity, gas and oil supplies remain adequate to meet consumer demand.

The Civil Contingencies Act 2004 complements energy legislation by establishing broader emergency-planning arrangements. Electricity operators forming part of critical infrastructure may therefore operate within both sector-specific regulation and national emergency-resilience arrangements.

3. Core Objectives of Electricity Resilience

The emerging national approach focuses on three connected priorities. First, authorities must develop a comprehensive understanding of system vulnerabilities, interdependencies and evolving risks. Second, infrastructure should incorporate resilience into its design so that failures of individual components do not produce disproportionate system-wide consequences. Third, government, NESO, Ofgem and industry must maintain effective arrangements for emergency preparedness, response and recovery.

These principles are particularly important because electricity supports telecommunications, transport, healthcare, water systems, financial services and other Critical National Infrastructure (CNI).

4. Infrastructure and Network Resilience

Resilience requires adequate generation capacity as well as robust transmission and distribution networks. The National Policy Statement EN-5 (2025) recognises that the security and reliability of present and future energy supply depend heavily upon electricity networks capable of accommodating increased generation, storage, interconnection and demand.

Network resilience therefore involves redundancy, asset maintenance, strategic investment, system flexibility, storage, interconnection and improved restoration capabilities.

5. Cybersecurity and Digital Resilience

Modern electricity systems increasingly depend on digital control systems, smart grids, communications networks and data platforms. Consequently, cyber resilience has become part of electricity security law and policy.

The Government's Energy Sector Cyber Security Strategy, published in May 2026, establishes a roadmap involving DESNZ, the National Cyber Security Centre, Ofgem and NESO to strengthen cybersecurity and resilience across Great Britain's energy sector.

6. Case Law

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 concerning development consent for the Drax Power Station project. The dispute required consideration of energy policy, including the relationship between new generating infrastructure, climate objectives and security of electricity supply.

Legal Issue

A central issue was whether the Secretary of State had lawfully applied national energy policy when assessing the need for generating infrastructure against environmental considerations.

Judgment

The Court of Appeal dismissed the appeal, accepting that the relevant national policy framework gave substantial importance to maintaining secure and reliable electricity supplies during the transition toward a low-carbon system.

Legal Principle / Ratio Decidendi

Energy infrastructure decisions must be taken within the applicable statutory and national-policy framework. Security and reliability of electricity supply are legitimate and significant considerations, but they operate alongside environmental and climate-law requirements.

Significance

The case demonstrates that electricity resilience is not purely an engineering concern. It forms part of the legal balancing exercise governing national infrastructure planning, particularly where security of supply and decarbonisation objectives interact.

7. Role of NESO and Ofgem

NESO performs a central role in system planning, balancing and security, while Ofgem regulates network companies and monitors compliance with licences and statutory obligations. Following the North Hyde incident, government also proposed stronger mapping of dependencies between electricity and other critical infrastructure and considered whether additional arrangements were required for whole-energy-system emergency coordination.

8. Conclusion

The National Strategy for Electricity Resilience represents an increasingly integrated approach combining energy law, infrastructure regulation, cybersecurity, emergency planning, climate adaptation and critical-infrastructure protection. Its objective is not merely to avoid blackouts but to ensure that the electricity system can anticipate threats, absorb disruption and restore essential services rapidly. The developing Energy Resilience Strategy therefore strengthens the connection between security of supply, network investment, NESO planning, Ofgem regulation, emergency preparedness and the UK's transition toward a cleaner electricity system.