EAM.6:2 - Problem

Nominal ratings can be added even when the assets cannot supply the same service together. A fallback can rely on the same failed provider as the asset it is meant to replace. Normal-load adequacy and a successful isolated-outage calculation can then conceal loss of several contributions together.

Recovery also changes the answer over time. Enough stored reserve for one interval may be exhausted before another asset becomes usable. A single final recovery time hides that intermediate service failure.