IN Brief:
- Great Britain’s energy sector now has a four-year cyber security strategy covering critical infrastructure, supply chains, and operational resilience.
- The strategy connects cyber security with Clean Power 2030, digital grids, decentralised assets, and data-led system operation.
- Energy operators, suppliers, and technology providers face a clearer path towards security assessment, capability building, and regulatory scrutiny.
The Department for Energy Security and Net Zero has published a four-year cyber security strategy for Great Britain’s energy sector, setting out a structured programme to strengthen the digital resilience of critical energy infrastructure.
Developed with Ofgem, the National Cyber Security Centre, and the National Energy System Operator, the strategy places cyber security alongside the physical and operational resilience needed to deliver Clean Power 2030. The electricity system is becoming more decentralised, data-led, and dependent on digitally controlled assets, while the organisations supporting it are becoming more exposed to third-party platforms, remote access, and connected operational technology.
The strategy covers the energy infrastructure and systems that support generation, networks, markets, and wider energy services. Although much of that infrastructure was built around centralised operation and long asset lifecycles, it is now being adapted for renewable generation, energy storage, smart devices, demand flexibility, and faster system balancing.
Across the first phase, running to the end of 2026, the government intends to deepen its understanding of sector cyber risks, identify operators that should be prioritised for targeted support, and develop preliminary supply-chain security principles. The programme then moves towards stronger assessment of supplier risk, clearer maturity expectations, and the possible direct regulation of critical suppliers where their role creates wider system exposure.
Recognised assurance schemes, including Cyber Essentials, are identified as part of the wider cyber security baseline. In energy environments, however, conventional corporate IT controls form only one layer of protection. Substation automation, control systems, distributed energy resources, remote monitoring, market platforms, and connected field devices create a wider security challenge that crosses organisational and technical boundaries.
As network operators connect more renewable generation, battery storage, EV charging, heat pumps, and industrial electrification loads, the number of assets exchanging operational data with the grid continues to rise. Each additional digital interface can improve visibility and flexibility, but it can also introduce new routes for disruption if security expectations are inconsistent across the supply chain.
The same pressure is visible in Ofgem’s energy network innovation round, which includes work on forecasting, connection acceleration, and digital tools for grid planning. That direction of travel makes secure data exchange and reliable system integration central to future network operation. Read more: Ofgem opens energy network innovation round.
Supply-chain oversight is likely to become one of the more demanding areas of the strategy. Digital substations, communications equipment, asset management systems, monitoring platforms, and cloud-connected operational tools can all create dependencies beyond the direct control of licensed network operators. Managing those dependencies through procurement, assurance, contractual obligations, and regulation is becoming part of normal infrastructure governance.
The challenge is sharpened by the pace of electricity infrastructure delivery. Grid connections, reinforcement works, flexibility markets, and major transmission upgrades are all being accelerated, while project teams are expected to maintain reliability across assets that may remain in service for decades. Cyber resilience cannot sit at the end of that process as a compliance exercise; it needs to be built into system design, supplier selection, testing, commissioning, and operational support.
By linking cyber security directly with energy transition delivery, the strategy gives digital resilience a firmer role in the engineering and regulation of Great Britain’s power system. The practical test will be whether operators, suppliers, and regulators can raise security maturity without slowing the infrastructure work needed to connect new generation and electrified demand.
The full strategy is available through GOV.UK.
