By the adoption of the ACER’s Decision 06/2016 on CCRs which set forth the Core Capacity Calculation Region (Core CCR), the 16 TSOs of the Core CCR will work together to implement all Core CCR assigned obligations stemming from all market and system operation guidelines and network codes. Both RSCs which are active in Core CCR, Coreso and TSCNET, are supporting the TSOs to develop, to validate and implement a common flow-based capacity calculation methodology.