ANNEX III U.K.

Frequency quality defining parameters referred to in Article 127:

Table 1

Frequency quality defining parameters of [F1 the GB synchronous area]

	F2 ...	GB	F2 ...	F2 ...
standard frequency range	F2 ...	± 200 mHz	F2 ...	F2 ...
maximum instantaneous frequency deviation	F2 ...	800 mHz	F2 ...	F2 ...
maximum steady-state frequency deviation	F2 ...	500 mHz	F2 ...	F2 ...
time to recover frequency	F2 ...	1 minute	F2 ...	F2 ...
frequency recovery range	F2 ...	± 500 mHz	F2 ...	F2 ...
time to restore frequency	F2 ...	15 minutes	F2 ...	F2 ...
frequency restoration range	F2 ...	± 200 mHz	F2 ...	F2 ...
alert state trigger time	F2 ...	10 minutes	F2 ...	F2 ...

Textual Amendments

F1 Words in Annex 3 Table 1 heading substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 127(a) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)

F2 Words in Annex 3 Table 1 omitted (E.W.S.) (31.12.2020) by virtue of The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 127(b) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)

Frequency quality target parameters referred to in Article 127:

Table 2

Frequency quality target parameters of [F3 the GB synchronous area]

	F4 ...	GB	F4 ...	F4 ...
maximum number of minutes outside the standard frequency range	F4 ...	15 000	F4 ...	F4 ...

Textual Amendments

F3 Words in Annex 3 Table 2 heading substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 127(a) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)

F4 Words in Annex 3 Table 2 omitted (E.W.S.) (31.12.2020) by virtue of The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 127(b) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)