KDE Neon power‑saving feature not lowering costs during low‑traffic workload

Symptom

When running a low‑traffic workload on a KDE Neon system, the expected reduction in operational costs from enabling a power‑saving feature is not observed.

Context

The workload consists of occasional HTTP requests with long idle periods. The system is configured to use the built‑in power‑management option that should scale down CPU frequency and suspend unused services during idle times.

Question

What specific checks or configurations should be verified to ensure the power‑saving feature is actually active and contributing to cost reduction for this workload?