ANNEX I Frequency ranges and time periods referred to in Article 12(1)
| Synchronous area | Frequency range | Time period for operation |
|---|---|---|
| Continental Europe | 47,5 Hz-48,5 Hz | To be specified by each TSO, but not less than 30 minutes |
| 48,5 Hz-49,0 Hz | To be specified by each TSO, but not less than the period for 47,5 Hz-48,5 Hz | |
| 49,0 Hz-51,0 Hz | Unlimited | |
| 51,0 Hz-51,5 Hz | 30 minutes | |
| Nordic | 47,5 Hz-48,5 Hz | 30 minutes |
| 48,5 Hz-49,0 Hz | To be specified by each TSO, but not less than 30 minutes | |
| 49,0 Hz-51,0 Hz | Unlimited | |
| 51,0 Hz-51,5 Hz | 30 minutes | |
| Great Britain | 47,0 Hz-47,5 Hz | 20 seconds |
| 47,5 Hz-48,5 Hz | 90 minutes | |
| 48,5 Hz-49,0 Hz | To be specified by each TSO, but not less than 90 minutes | |
| 49,0 Hz-51,0 Hz | Unlimited | |
| 51,0 Hz-51,5 Hz | 90 minutes | |
| 51,5 Hz-52,0 Hz | 15 minutes | |
| Ireland and Northern Ireland | 47,5 Hz-48,5 Hz | 90 minutes |
| 48,5 Hz-49,0 Hz | To be specified by each TSO, but not less than 90 minutes | |
| 49,0 Hz-51,0 Hz | Unlimited | |
| 51,0 Hz-51,5 Hz | 90 minutes | |
| Baltic | 47,5 Hz-48,5 Hz | To be specified by each TSO, but not less than 30 minutes |
| 48,5 Hz-49,0 Hz | To be specified by each TSO, but not less than the period for 47,5 Hz-48,5 Hz | |
| 49,0 Hz-51,0 Hz | Unlimited | |
| 51,0 Hz-51,5 Hz | To be specified by each TSO, but not less than 30 minutes |
The table shows the minimum time periods for which a transmission-connected demand facility, a transmission-connected distribution facility or a distribution system has to be capable of operating on different frequencies, deviating from a nominal value, without disconnecting from the network.