FERC Orders

Order 842 — Primary Frequency Response (2018)

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Definition

Required all new generators seeking bulk power system interconnection to demonstrate the technical capability to provide primary frequency response — the automatic, governor-droop-based reaction that stabilizes grid frequency within seconds following a sudden generation or load imbalance event. As inverter-based wind and solar have replaced synchronous generators, the grid has lost Synchronous Inertia that historically provided this stabilization, making explicit frequency response capability critical for reliable operations. The order established specific droop (≤5%) and deadband (±0.036 Hz or less) settings that all new generators must meet as a condition of interconnection.

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