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The automatic regulation of the power output of electric generators within a prescribed range in response to a change in system frequency, or tie-line loading, to maintain system frequency or scheduled interchange with other areas within predetermined limits.
- Browse Related Terms: Ancillary services, Automatic generation control, availability, Baseload Unit, Capacity factor, Control area, Financial liquidity, Fuel-adjustment clause, Installed capacity, Load pocket, Mothballed capacity, Peaking capacity, Plant factor, Ramp rate, Reliability must run (RMR), Retail unbundling, Voltage reduction, Wholesale electricity markets