A power envelope is the defined upper and lower range of electrical power a system, component, or workload is expected to stay within. It acts like a guardrail: the load should not swing too high, too fast, or too low for the operating conditions. In cloud and datacenter environments, power envelopes are often used to keep servers, GPUs, and supporting infrastructure within safe and predictable limits.
This matters in cyber security because power is not just an engineering detail; it can become an attack surface. A workload that rapidly moves outside its envelope may stress cooling, power delivery, or even grid-facing equipment. Defenders use power envelopes to cap spikes, smooth ramp rates, and detect abnormal coordination across jobs or tenants. In a hostile setting, attackers may try to shape legitimate compute activity into a repeated high-low pattern that creates instability, while operators respond with telemetry, throttling, and policy enforcement to keep demand inside safe bounds.