OT cybersecurity issues facing the UK energy industry
The UK energy sector is undergoing a profound transformation. As the country accelerates its transition to cleaner, decentralized power sources, the grid is becoming more complex – and more vulnerable. Operational Technology (OT) systems, which control physical processes in power generation and distribution, are now critical to keeping the lights on. Unlike traditional IT breaches that target data, OT attacks can disrupt electricity flows, damage equipment, and trigger cascading failures across the national grid.
From large-scale renewable projects to thousands of small wind and solar installations powering homes and businesses, digital connectivity underpins this new energy landscape. While these technologies enable efficiency and flexibility, they also introduce significant cybersecurity risks. Smaller facilities often lack the resources for robust protection, making them attractive targets for cybercriminals and state-sponsored actors. A coordinated attack on multiple sites could destabilize the entire network, causing widespread outages and economic disruption.
As geopolitical tensions rise and adversaries increasingly view energy systems as strategic assets, safeguarding OT environments is no longer optional – it’s essential for national security and the resilience of the UK’s energy supply.
The renewable energy factor: A growing risk
While large-scale power stations have long been considered critical assets, the UK’s energy transition has introduced new vulnerabilities. The rapid rise of small-scale wind and solar plants powering homes and businesses adds an extra layer of risk. These decentralized facilities rely heavily on internet-connected technologies, making them attractive targets for cybercriminals. Unlike traditional plants backed by major utilities, smaller renewable operators often lack the financial resources to implement robust cybersecurity measures.
A common misconception is that hacking a single small plant would have little impact. In reality, a coordinated attack on multiple sites could trigger a domino effect, destabilizing the grid and causing widespread blackouts. As the UK moves toward a decentralized energy system, addressing these vulnerabilities is critical to maintaining a stable and reliable supply.
Supply chain risks and emerging threats
The sector’s reliance on an intricate web of suppliers and service providers further aggravates exposure. Smaller vendors often lack strong cybersecurity programs, making them attractive entry points for attackers. Adversaries are increasingly deploying AI-powered phishing campaigns and advanced malware capable of reaching Stage 2 of the ICS Cyber Kill Chain, executing attacks directly on industrial control systems that underpin power generation and grid operations.
Utility-scale battery energy storage systems (BESS) are also emerging as prime targets. A recent report from Brattle Group and Dragos warns that these deployments, expected to grow between 20 and 45 percent over the next five years, are outpacing the sector’s ability to secure them. Battery storage systems are increasingly used across the grid to enable renewable integration, which makes them an attractive target for sophisticated threat groups as outages could cost millions and disrupt grid stability.
The UK government has acknowledged these challenges, with the Cyber Security and Resilience Bill progressing through Parliament to strengthen protections for essential services. Electricity and gas operators must comply with the Network and Information Systems (NIS) Regulations, guided by frameworks such as the NCSC’s Cyber Assessment Framework (CAF). Yet compliance alone is not enough. Cybersecurity must be embedded into operational DNA, ensuring that security measures evolve alongside digital transformation and the growing complexity of energy systems.
Defending operational technology environments requires a fundamental shift in priorities. Traditional IT security models, focused on data confidentiality, must adapt to emphasize safety, reliability, and uptime across generation, transmission, and distribution networks. Organizations need to start with asset visibility because you cannot protect what you cannot see. Comprehensive inventories of OT assets are essential to identify vulnerabilities and prioritize remediation. Network segmentation is equally critical, isolating OT systems from IT networks to reduce the risk of lateral movement.
Preparedness is another cornerstone of resilience. OT-specific incident response plans enable rapid containment and recovery without compromising operational safety. Collaboration between industry, government, and vendors through threat intelligence sharing is vital to stay ahead of evolving risks.
Technology alone cannot solve this challenge. Skilled professionals remain the cornerstone of effective cybersecurity, yet the energy sector faces a talent shortage, particularly in OT-specific roles. Investing in training and fostering a culture of cyber awareness – from the boardroom to the control room – is critical to bridging this gap and safeguarding the long-term future of the energy sector.
As the UK energy sector races toward a low-carbon future, cyber threats are evolving just as fast. Operators must embed OT cybersecurity into every layer of their operations, ensuring visibility, secure architectures, and robust incident response plans. Compliance frameworks like the Cyber Security and Resilience Bill and NIS Regulations set the baseline, but true resilience demands proactive measures that go beyond regulatory checklists.
Collaboration will be critical. Industry, government, and technology partners must share intelligence and co-ordinate responses to stay ahead of adversaries targeting everything from grid systems to battery storage. By combining technology, governance, and skilled professionals, the sector can protect national security while delivering on sustainability goals – powering a future that is both clean and secure.
Phil Tonkin
Phil Tonkin is Field CTO at Dragos, Inc. Dragos has a global mission to safeguard civilization from those trying to disrupt the industrial infrastructure we depend on every day. The Dragos Platform offers the most effective industrial cybersecurity technology, giving customers visibility into their ICS/OT assets, vulnerabilities, threats, and response actions. Its community-focused approach gives access to the largest array of industrial organizations participating in collective defense, with the broadest visibility available.