Frequency Restoration Reserves

The active power reserves available to restore system frequency to the nominal frequency

Last Updated:  November 28, 2025

Version:  1.0.0

Generated:  January 19, 2026

Tags:  

# frequency-control    # reserve    # european-union    # europe

See Also:  

Contingency Reserve    Frequency Containment Reserves    Replacement Reserves

Definition in a European Union Regulation

Source: p5

‘frequency restoration reserves’ or ‘FRR’ means the active power reserves available to restore system frequency to the nominal frequency and, for a synchronous area consisting of more than one LFC area, to restore power balance to the scheduled value

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