Grid incidents in one area may have major consequences for neighbouring zones, requiring TSOs to regionally coordinate the security calculations. This is why the Coordinated Security Analysis (CSA) service aims at:

  • Performing analysis to detect operational security violations on the grid;
  • Recommending remedial actions to TSOs to solve the identified constraints.

A violation of operational security limits is a flow that is above the capacity of a circuit and that needs to be reduced to an acceptable level. To enable RSCs (and future RCCs) to perform the CSA service, the CSA process requires TSOs to provide RSCs with different inputs:

  • Their Individual Grid Models (IGMs) that will be merged into a Common Grid Model (CGM);
  • The list of their assessed elements;
  • The contingencies that need to be simulated;
  • The available Remedial Actions (RAs).

6 steps of the CSA process

In day-ahead timeframe, steps 1 to 5 are performed twice, followed by one final validation session.

In case of a violation of operational security limits on cross-border relevant network elements, multiple measures in multiple TSO networks may be necessary. As a result, a close coordination between TSOs and RSCs is essential to ensure the most effective and economically efficient Remedial Actions (RAs).

When the operational security violations have been resolved in each region, the residual violations in the overlapping zones between regions will be addressed through a cross-regional process.

The CSA service will performed for the day-ahead and intraday timeframes. Coreso must perform the CSA processes for South-West Europe (SWE) Capacity Calculation Region (CCR) as well as for the Italy North CCR and CORE CRR in collaboration with TSCNET.

Read more information about this CSA service in our annual report or consult the SOGL regulation.

This service is still under development. Therefore, the above explanations may be amended after the full development of this service takes place.