Cybersecurity in electricity distribution networks is no longer just about “compliance”, it’s about operational resilience. Grid digitalisation (AMI, SCADA, DER integration and remote operations) has multiplied endpoints and with them the risks: loss of visibility, meter data manipulation, unauthorised commands, or persistent access enabled by weak credentials and unpatched firmware. This article explains, at a high level, how to tackle the challenge through three inseparable layers (device, communications and operations) and what frameworks like NIS2 and the Cyber Resilience Act mean for DSOs: verifiable security, a controlled supply chain, and a realistic roadmap to reduce risk without stopping the grid.
In a modern electricity distribution network, every device can become a potential entry point: smart meters, data concentrators, sensors in secondary substations… Digitalisation—remote metering, automation, DER integration and remote operations, has multiplied assets and communication channels. If cybersecurity is not built in by design across OT/IT, an incident can escalate from data to service: loss of availability, unsafe operation, reduced data quality, or access to private and sensitive information.
When we talk about cyber threats, the extreme scenario often dominates the conversation. But in distribution, the most common impacts are quiet and recurring:
- Loss of visibility (SCADA/telecontrol)
- Meter data manipulation or degraded measurement reliability
- Unauthorised commands or parameter changes
- Ransomware with indirect operational effects
- Persistent access due to leaked credentials and unpatched firmware
The outcome is the same: more operational friction, more incidents, and less trust in data for decision-making.
In a network with thousands or millions of endpoints, the most vulnerable point is often the simplest one:
- Legacy or unpatched devices
- Equipment without sufficient cybersecurity controls
- Unencrypted communications
- Exposed interfaces
- Poorly controlled supply chain (support, patches, evidence)
The conclusion is clear: in distribution, security cannot rely on a single barrier.
Safe Operation of OT/AMI Concentrators
To make cybersecurity operational (and auditable), it helps to structure it into three layers that must work together:
1) Device layer: security at the endpoint
- Secure configuration (hardening)
- Strong identities and least privilege
- Event logging
- Secure firmware updates
2) Communications layer: protect the channel and the message
- Encryption and mutual authentication where applicable
- Certificate/credential management
- OT/IT segmentation and monitoring
3) Operations layer: resilience in the real world
- A “living” asset inventory
- Vulnerability management
- Incident response and recovery testing
LV monitoring and analytics platform
In Spain, the security and incident notification/management approach builds on the NIS transposition through Royal Decree-Law 12/2018, further developed by Royal Decree 43/2021, and the critical infrastructure protection framework under Law 8/2011.
At EU level, NIS2 (Directiva (UE) 2022/2555) explicitly includes electricity—including distribution system operators (DSOs)—as a highly critical sector, raising the bar on risk management, governance and reporting. In Spain, the draft bill to transpose NIS2 approved in January 2025 reflects an ongoing national implementation process—making early preparation the smart move.
The Cyber Resilience Act (Reglamento (UE) 2024/2847) sets mandatory cybersecurity requirements for products with digital elements throughout their lifecycle. This affects manufacturers and also DSOs: procurement will increasingly require demonstrable security (support, patches, evidence), not just price.
Across Europe, the direction is consistent: NIS2 sets a common framework that each Member State transposes; in addition, the CER Directive (EU) 2022/2557 strengthens resilience of critical entities, and the Cybersecurity Act (Reglamento (UE) 2019/881) Cybersecurity Act (Regulation (EU) 2019/881) supports EU-wide certification. For DSOs operating across multiple countries, the practical conclusion is simple: security by default plus a supply chain that can prove it.
Cybersecurity in distribution networks is no longer an “extra”: it is an operational and regulatory requirement. With NIS2 and the CRA pushing the market towards verifiable security, the priority is to move from a reactive approach to an executable plan that reduces exposure across devices, communications and operations, without compromising continuity of service.
Technical STG-DC (Operation of Concentrators with Cybersecurity by Design), updating the elements already in service, and replacing assets that cannot be updated—supported by governance that is ready to comply and respond.
