Power resilience is the ability of electrical infrastructure to keep services running reliably during faults, peaks in demand, maintenance, or outages. In practice, it means a site can absorb disruption without losing critical systems.
In cyber security, power resilience matters because attackers do not always need to break encryption or steal credentials. They may target availability by cutting power, overloading systems, or exploiting weak backup design. A data center, hospital, or telecom node that loses electricity can take security controls, logging, and communications offline, making other attacks easier. Strong defenses use uninterruptible power supplies, generators, redundant feeds, load balancing, and tested failover procedures.
For defenders, power resilience is both an operational and security control. It reduces downtime, preserves incident response capability, and helps keep essential services available even when the grid is unstable or under pressure.