Disturbance

Any perturbation or sudden loss of generation or interruption of load.

Last Updated:  December 03, 2025

Version:  1.0.1

Generated:  December 04, 2025

Definition by NERC

Means (i) any perturbation to the electric system, or (ii) the unexpected change in ACE that is caused by the sudden loss of generation or interruption of load.

Definition in a European Union Regulation

Source: p6

‘disturbance’ means an unplanned event that may cause the transmission system to divert from the normal state;