Fingrid will update its CNEC/combined dynamic constraint list in accordance with the Nordic CCM Articles 5 and 6.
Fingrid will include a new recently introduced transmission line in the grid model and therefore also to flow-based calculation input. That will mean addition of new CNECs as a result of the line (CNE) and the respective contingencies combined.
This makes the P0 PTC (combined dynamic constraint) unnecessary, as from now on the limiting factor will be thermal limit also in outage situations. It means that dynamic-based limitations do not exist anymore (on P0-cut) and thus having PTC is no longer needed. Therefore, Fingrid will exclude P0 PTC from the flow-based calculations. The market impact of the changes is expected to be minimal/small. We base this statement in observation that P0 PTCs have rarely been limiting the domain before and therefore one could not expect anything but minimal impact due to the change. Validation for the observation can be derived from JAO platform (PuTo Nordic CCR) publication history by looking how often the PTCs (to be excluded) have fulfilled the following condition: NonRedundant=TRUE.
As a repetition, the change is based on a topology change as we got a new physical line to support P0-cut flow. Thus, impact is considered to be only positive, in terms of initial capacity for the FI BZ internal flows. The changes will be effective in the flow-based domain from EDD 24.04.2025.
The file below shows the exact list of CNECs and PTCs changes:
CNEC & PTC updates Fingrid 22-04-2025
This message was also published on NUCS in shorter version.