Energy security is the ability of a power system to keep electricity, fuel, and heat available despite shocks such as supply disruptions, infrastructure failures, extreme weather, or sharp price spikes. In practice, it is about resilience: having enough redundancy, diversity, storage, and operational flexibility to keep critical services running when one part of the system is stressed.
In cyber security, energy security matters because modern grids, substations, solar farms, batteries, and industrial control systems depend on digital monitoring and remote control. A cyberattack can disrupt generation, prevent operators from seeing what is happening, or force unsafe switching and shutdowns. Defenses therefore focus on network segmentation, strong access control, logging, backup communications, offline recovery plans, and tested manual fallback procedures. The goal is not just to keep hackers out, but to preserve reliable supply even when systems fail or are under attack.