UK Gov Energy Cyber Security Strategy: Proving resilience, not just compliance

The UK Government’s Energy Sector Cyber Security Strategy sets out a clear 2026–2030 roadmap for improving cyber resilience across Great Britain’s energy system. It reflects a sector facing growing cyber threat, rapid digitalisation, OT/IT convergence, complex supply chains and the demands of Clean Power 2030.

The strategy’s message is clear: cyber risk must be treated with the same seriousness as safety, reliability and operational resilience. Energy organisations need to move beyond policy compliance and demonstrate that their controls, response plans and governance arrangements work in practice.

Strategy link: https://www.gov.uk/government/publications/energy-sector-cyber-security-strategy/energy-sector-cyber-security-strategy

What the strategy is asking for

The strategy calls for energy organisations to identify, assess and manage cyber risks across critical systems, suppliers and high-impact points of failure. It also expects cyber resilience to increase at pace, response and recovery plans to be tested, and assurance activity to keep pace with the evolving threat and system landscape.

CGI can help energy organisations respond through:

• Cyber Resilience Audit to assess whether cyber controls are proportionate, evidenced and effective.
• Penetration testing to identify exploitable weaknesses before attackers do.
• CyAS and adversary simulation to test prevention, detection and response against realistic attack scenarios.
• Executive and operational tabletop exercises to rehearse decision-making, escalation, communications and recovery under pressure.
• OT/IT cyber resilience reviews to bridge the gap between operational technology, engineering teams and enterprise cyber security.
• CAF-aligned maturity assessment to benchmark resilience against recognised UK cyber assurance expectations.
• Board reporting aligned to the UK Cyber Governance Code of Practice and NCSC Board Toolkit to help boards understand risk, assurance, investment priorities and resilience progress.

UK Cyber Governance Code of Practice: https://www.gov.uk/government/publications/cyber-governance-code-of-practice

NCSC Cyber Security Toolkit for Boards: https://www.ncsc.gov.uk/collection/board-toolkit

The key dates for energy organisations

By the end of 2026, government and regulators expect stronger understanding of cyber risk across the most critical parts of the energy system, stronger assurance processes through access to assured industry providers, and a cross-industry exercise to test response to a sophisticated cyber-attack.

By the end of 2027, the focus shifts to strengthening supply chain assessment, accelerating maturity for critical systems and building a stronger cyber culture based on risk, collaboration, capability and intelligence. This includes bridging the gap between OT engineering and cyber, one of the hardest but most important issues for the energy sector.

By the end of 2028, the strategy expects a CEO tabletop exercise to ensure practical understanding of cyber risks.

By 2030, the sector is expected to have access to advanced capability testing schemes to prove defences, including approaches based on the NCSC Cyber Adversary Simulation Scheme, or CyAS.

NCSC CyAS link: https://www.ncsc.gov.uk/schemes/cyber-adversary-simulation-cyas/introduction

From testing to assurance

The strategy points directly towards deeper assurance. Cyber Resilience Audit helps organisations evidence cyber maturity and control effectiveness. Penetration testing identifies weaknesses that could be exploited. CyAS-style adversary simulation tests whether an organisation can prevent, detect and respond to realistic cyber-attacks.

For energy organisations, this matters most at the boundary between enterprise IT, operational technology, suppliers, remote access, identity, monitoring and recovery. These are the areas where cyber incidents can quickly become operational resilience issues.

Making cyber real for boards

The strategy reinforces the need for better board understanding and ownership of cyber risk. This aligns strongly with the UK Cyber Governance Code of Practice and the NCSC Cyber Security Toolkit for Boards.

Board reporting needs to be holistic. It should explain cyber risk in terms of essential services, operational impact, control effectiveness, investment priorities, incident readiness and progress against agreed improvement plans — not just technical dashboards.

The takeaway

The direction of travel is clear: energy organisations need to prove resilience, not just describe it.

That means testing controls, exercising response plans, strengthening OT/IT collaboration, assessing suppliers, improving board reporting and using independent assurance to evidence progress. CGI can support energy organisations across each of these areas, helping them align with the Energy Sector Cyber Security Strategy, the UK Cyber Governance Code of Practice and the NCSC Board Toolkit.