The CSE area, around Italy’s northern border, is characterised by substantial imports into the Italian grid. To maximise market welfare and ensure safe grid operation, the 5 TSOs and 2 RSCs active in the area have set up a coordinated D-2 capacity calculation process.

First steps towards developing this coordinated process were taken in 2012, and Coreso has been a key project participant since the start and throughout the various phases of the project. In summer 2015, the project reached the external dry-run stage, which involved disclosing the calculated transfer capacities to all stakeholders, but not using them for actual capacity allocation. The process officially went live on 1 February 2016 with calculated capacity results used for allocation on day-ahead energy exchanges.

The process uses the input files from all the TSOs concerned in the CSE area, describing the best forecast of their individual grid situation from 2 days in advance in D2CF files. The latest day-ahead congestion forecast files are used as input for TSOs outside the CSE area and merged to create a forecast of the grid situation on the respective business day. An algorithm is applied to the merged grid model to simulate different import levels and optimise the use of remedial actions in the area to achieve the highest possible secure level of imports on Italy’s northern border.