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'Cross-zonal capacity' means the capability of the interconnected system to accommodate energy transfer between bidding zones (Article 2(10) of the Regulation 543/2013 of 14 June 2013 on submission and publication of data in electricity markets).
Firmness of allocated cross-zonal capacity is crucial from the perspective of electricity trading.
Winter Energy Package (Annex to the Proposal for a Regulation of the European Parliament and of the Council on the internal market for electricity (recast), 30.11.2016, COM(2016) 861 final 2016/0379 (COD)) provides for the coordinated calculation of cross zonal capacities.
This task is entrusted to Regional Operational Centres (ROCs).
According to the aforementioned rules coordinated capacity calculation should be performed:
- for each market timeframe,
- as frequently as needed during the intraday timeframe,
- based on a common system model and on the coordinated capacity calculation methodology developed by the transmission system operators of the relevant system operation region.
Coordinated capacity calculation must, moreover, ensure efficient congestion management in accordance with the principles of congestion management defined in the said Regulation.
Proposal for a Regulation of the European Parliament and of the Council on the internal market for electricity (recast), 30.11.2016, COM(2016) 861 final 2016/0379 (COD
Allocation of cross-zonal capacity across timeframes
1. Transmission system operators shall recalculate available cross-zonal capacity at least after day-ahead and after intraday cross-zonal gate closure times. Transmission system operators shall allocate the available cross-zonal capacity plus any remaining cross-zonal capacity not previously allocated and any cross-zonal capacity released by physical transmission right holders from previous allocations in the next cross-zonal capacity allocation process.
2. When cross-zonal capacity is available after the intraday cross-zonal gate closure time, transmission system operators shall use the cross-zonal capacity for the exchange of balancing energy or for operating the imbalance netting process.
3. Transmission system operators shall use the methodologies developed in network codes and guidelines on balancing, where applicable, to allocate cross-zonal capacity for the exchange of balancing capacity or sharing of reserves pursuant to Article 5(4) and (7).
4. Transmission system operators shall not increase the reliability margin calculated pursuant to Regulation (EU) 2015/1222 due to the exchange of balancing capacity or sharing of reserves.