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=== Seconds-after control ===
The ''primary control'' is engaged automatically withing seconds after the frequency disturbance. Primary control stabilizes the situation, but does not return the conditions to the normal and is applied both to the generation side (where the [[Governor (device)|governor]] adjusts the power of the [[Prime mover (engine)|prime mover]]) and to the load, where:{{sfn|NERC|2011|p=12}}
* induction motors self-adjust (lower frequency
* under-frequency relays disconnect [[interruptible load]]s;
* [[ancillary services]] are engaged.
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