Frequency Restoration Reserves

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

Definition in a European Union Regulation

Source: ¹ (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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Last modified: 2025-11-28

Related: contingency-reserve · frequency-containment-reserves · replacement-reserves

← Frequency Response Measure · Frequency Stability →

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1. (2017). Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation. http://data.europa.eu/eli/reg/2017/1485/oj ↩