General requirements for cross-border control processes
Article 149
1. All TSOs participating in an exchange or sharing of FRR or RR shall implement a cross-border FRR or RR activation process, as appropriate. 2. All TSOs of a synchronous area shall specify in the synchronous area operational agreement the roles and responsibilities of the TSOs implementing an imbalance netting process, a cross-border FRR activation process or a cross-border RR activation process between LFC areas of different LFC blocks or of different synchronous areas. 3. All TSOs participating in the same imbalance netting process, in the same cross-border FRR activation process or in the same cross-border RR activation process shall specify in the respective agreements, the roles and responsibilities of all TSOs including: (a) the provision of all input data necessary for: (i) the calculation of the power interchange with respect to the operational security limits; and (ii) the performance of real-time operational security analysis by participating and affected TSOs; (b) the responsibility of calculating the power interchange; and (c) the implementation of operational procedures to ensure the operational security. 4. Without prejudice to Article 146(9), (10) and (11) and as part of the agreements referred to in Articles 122, 123 and 124, all TSOs participating in the same imbalance netting process, cross-border FRR activation process or cross-border RR activation process shall have the right to specify a sequential approach for calculation of the power interchange. The sequential calculation of the power interchange shall allow any group of TSOs operating LFC areas or LFC blocks connected by interconnections to interchange imbalance netting, frequency restoration or reserve replacement power among themselves ahead of an interchange with other TSOs.