Dear market participants,
The CWE TSOs and NEMOs would like to give further insight on the operational issue recently experienced in the CWE region, and communicated to the market through market messages posted on the JAO message board (link to https://www.jao.eu/news/messageboard/overview ) from Jan 16th.
As communicated, an issue related to a market clearing point outside of the flow-based domain led to an increased risk of decoupling. Market coupling results exceeded some of the capacity calculation limits.
Timeline of events
During the market coupling sessions of Wednesday (13/01 for BD 14/01) and Thursday (14/01 for BD 15/01) an issue occurred during the validation of the CWE market coupling results more specifically for the validation of the net positions.
TSOs immediately took ad-hoc measures to ensure operational safety and avoid decoupling at the same time on Friday 15/01 in parallel with the investigations. Additionally, Elia switched from Allocation Constraint to External Constraint as it was unclear at that stage if there was any cause-effect relationship between the introduction of allocation constraint and the occurrence of the issue.
Over the weekend of Jan 16-17th, the root cause was identified as being related to the implementation of the Extended formulation for Long Term Allocation (LTA) inclusion on ALEGrO. Hence Elia and Amprion reduced capacity on the ALEGrO interconnector to 250MW from Jan 16th for BD Jan 18th onwards in order to limit/mitigate the potential discrepancies.
Temporary fix
A reliable temporary fix was developed, tested and implemented on Jan 18th to work for BD Jan 20th onwards so that this incident will not reoccur. The temporary measures were rolled back accordingly, enabling again the allocation of the full 1000 MW capacity of the ALEGrO interconnector and the use of the Allocation Constraint by Elia.
The fix consists of TSOs submitting a combined flow based and LTA domain to Euphemia, thereby resulting in a situation similar to the one in place before the implementation of the Extended formulation for LTA inclusion. Market Participants are not impacted by these changes and the fix does not impact the publication of CWE FB related information on JAO.
Outlook
All parties continue with the highest priority to search for a permanent solution, allowing for re-establishing the usage of the Extended formulation for LTA inclusion and will inform the market as soon as this solution is developed and a plan for its implementation is in place.
Best regards,
CWE TSOs and NEMOs
This message was first published on the JAO Message Board Wednesday 20 January at 17.27 CET
https://www.jao.eu/news/messageboard/view?parameters={%22NewsId%22%3A%226547b1fb-8491-4c7f-ae8a-acb6012082f2%22%2C%22FromOverview%22%3A%221%22}
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