Definition
Frequency regulation is the ancillary service that keeps a power grid's alternating-current frequency locked to its nominal target — 60 hertz in North America, 50 hertz in much of the rest of the world. Frequency rises when generation exceeds demand and falls when demand exceeds generation, so the grid operator continuously dispatches resources up and down, often every few seconds, to hold the balance. Even small, sustained deviations can damage equipment and, if uncorrected, cascade into outages.
Regulation up and regulation down
The service has two directions. Regulation up means adding generation or shedding load to lift a sagging frequency; regulation down means reducing generation or adding load to pull an over-frequency back to target. Providers are typically paid both for the capacity they reserve and for the energy they actually move when signaled, following an automatic generation control (AGC) signal sent by the operator.
Relevance to flexible mining load
Because Bitcoin miners can curtail or restore power draw almost instantly and with fine granularity, a mining facility can supply regulation-down by absorbing surplus energy and regulation-up by pausing hashing within the response window. This responsiveness is faster than many thermal generators can manage, which is part of why grid operators increasingly value large controllable loads. The economic catch is that committed capacity must remain on call, so a fleet earning regulation revenue cannot also be running flat-out at all times.
Frequency regulation is one product within the broader family of ancillary services, and it is closely related to spinning reserve. Mines typically access it via demand response programs.
In Simple Terms
Frequency regulation is the ancillary service that keeps a power grid’s alternating-current frequency locked to its nominal target — 60 hertz in North America, 50…