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Fast Frequency Response

FFR. Power in response to frequency changes during the arresting phase

Definition in a NERC Webinar by ERCOT

Source: 1

Power injected to (or absorbed from) the grid in response to changes in measured or observed frequency during the arresting phase of a frequency excursion event to improve the frequency nadir or initial rate-of-change of frequency

Last modified: 2025-06-22

Related: primary-control · secondary-control · frequency-stability

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  1. NERC (2020). Industry Webinar- White Paper: Fast Frequency Response Concepts and Bulk Power System Reliability Needs. https://www.nerc.com/comm/PC/IRPTF_Webinars_DL/2020-04_Webinar-FFR_White_Paper.pdf ↩