Security and privacy for critical national infrastructure.

Energy providers, utilities, transport operators, and water companies sit at the intersection of physical and digital risk. Threat actors — including state-sponsored groups — specifically target critical infrastructure because disruption causes maximum societal impact.

The threat landscape has shifted materially. Operational technology (OT) and industrial control systems (ICS), once isolated from the internet, are increasingly converged with IT networks. That convergence creates new attack surfaces that traditional IT security approaches do not adequately address.

The regulatory environment is tightening. The UK’s Network and Information Systems (NIS) Regulations already impose mandatory security duties on operators of essential services. NIS2 at EU level sets a higher bar, and UK equivalents are expected to follow. Failure to comply carries significant fines and, more critically, the risk of genuine operational disruption.

Principle Defence has supported multiple CNI organisations across energy, utilities, and transport in building and maintaining security programmes. Our team brings real-world experience of the operational constraints and consequence environment that makes CNI security genuinely different from any other sector.