The CACM guideline sets out rules for capacity allocation â€“ allocating the available cross-border capacity on the electricity transmission infrastructure in day-ahead and intraday timescales, and outlines the way in which capacity will be calculated across the different zones. CACM also sets out the rules for congestion management, the management of scarce transmission capacity among the parties requesting use of such capacity.
The target model, as defined by the CACM Framework Guidelines, specifies that TSOs need to apply an Available Transfer Capacity (ATC) or a Flow-based (FB) method for Capacity Calculation. Flow-based allocation method is preferable for short-term capacity calculation in highly meshed and highly interdependent grids. In any case, a common grid model is to be used.
Coordination among the TSOs will be of key importance for successful implementation of the required capacity calculation method, for optimizing the utilization of the infrastructure and for implementing the flow-based allocation method. Coordination with regard to capacity calculation will be required among all TSOs not only when two regions apply the same method (FB or ATC) but also in cases when one region applies the FB and the other ATC-based calculations.