Imbalance netting process
Article 146
1. The control target of the imbalance netting process shall aim at reducing the amount of simultaneous counteracting FRR activations of the different participating LFC areas by imbalance netting power interchange. 2. Each TSO shall have the right to implement the imbalance netting process for the LFC areas in the same LFC block, between different LFC blocks or between different synchronous areas, by concluding an imbalance netting agreement. 3. TSOs shall implement the imbalance netting process in a way which does not affect: (a) the stability of the FCP of the synchronous area or synchronous areas involved in the imbalance netting process; (b) the stability of the FRP and the RRP of each LFC area operated by participating or affected TSOs; and (c) operational security. 4. TSOs shall implement the imbalance netting power interchange between LFC areas of a synchronous area in at least one of the following ways: (a) by defining an active power flow over a virtual tie-line which shall be part of the FRCE calculation; (b) by adjusting the active power flows over HVDC interconnectors. 5. TSOs shall implement the imbalance netting power interchange between LFC areas of different synchronous areas by adjusting the active power flows over HVDC interconnectors. 6. TSOs shall implement the imbalance netting power interchange of a LFC area in a way which does not exceed the actual amount of FRR activation necessary to regulate the FRCE of that LFC area to zero without imbalance netting power interchange. 7. All TSOs participating in the same imbalance netting process shall ensure that the sum of all imbalance netting power interchanges is equal to zero. 8. The imbalance netting process shall include a fallback mechanism which shall ensure that the imbalance netting power interchange of each LFC area is zero or limited to a value for which operational security can be guaranteed. 9. Where a LFC block consists of more than one LFC area and the reserve capacity on FRR as well as the reserve capacity on RR is calculated based on the LFC block imbalances, all TSOs of the same LFC block shall implement an imbalance netting process and interchange the maximum amount of imbalance netting power defined in paragraph 6 with other LFC areas of the same LFC block. 10. Where an imbalance netting process is implemented for LFC areas of different synchronous areas, all TSOs shall interchange the maximum amount of imbalance netting power defined in paragraph 6 with other TSOs of the same synchronous area participating in that imbalance netting process. 11. Where an imbalance netting process is implemented for LFC areas which are not part of the same LFC block, all TSOs of the LFC blocks involved shall comply with the obligations in Article 141(5) regardless of imbalance netting power interchange.