A counter-deviation is a deviation that occurs in the power system as a response to an initial deviation, with the aim of restoring the balance between electricity production and consumption. When one part of the system experiences a deviation, such as an excess or shortage of electricity, another part of the system can create a counter-deviation to compensate for this difference and stabilize the system.

Counter-deviations are an important tool in power system management because they allow operators to quickly respond to unexpected changes in electricity supply and demand.