ANNEX III

Frequency quality defining parameters referred to in Article 127: Table 1 Frequency quality defining parameters of the synchronous areas CE GB IE/NI Nordic standard frequency range ± 50 mHz ± 200 mHz ± 200 mHz ± 100 mHz maximum instantaneous frequency deviation 800 mHz 800 mHz 1000 mHz 1000 mHz maximum steady-state frequency deviation 200 mHz 500 mHz 500 mHz 500 mHz time to recover frequency not used 1 minute 1 minute not used frequency recovery range not used ± 500 mHz ± 500 mHz not used time to restore frequency 15 minutes 15 minutes 15 minutes 15 minutes frequency restoration range not used ± 200 mHz ± 200 mHz ± 100 mHz alert state trigger time 5 minutes 10 minutes 10 minutes 5 minutes Frequency quality target parameters referred to in Article 127: Table 2 Frequency quality target parameters of the synchronous areas CE GB IE/NI Nordic maximum number of minutes outside the standard frequency range 15000 15000 15000 15000

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Source: EUR-Lex (Cellar) · retrieved 2026-11-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.