Corrective Measures
Corrective Measures are remedial actions that form part of the algorithm methodology used within the Single Day-Ahead Coupling (SDAC) and Single Intraday Coupling (SIDC). Their purpose is to ensure stable and reliable functioning of the market algorithms in case of performance degradation (e.g. when the time required to find a solution increases).
These measures allow Nominated electricity market operators (NEMOs) and Transmission system operators (TSOs) to temporarily restrict or simplify the use of certain products or algorithm functions to prevent risks to market operation.
Corrective measure activation process
Monitoring corrective actions
Auction markets
Activation occurs when monitoring shows that the Time To First Solution (TTFS) exceeds defined threshold values.
There are two types of monitoring:
- Short-term (daily) – monitors TTFS (Time to first solution) daily,
- Long-term (monthly) – according to the algorithm methodology (AM, Article 12).
If thresholds are exceeded, an evaluation and recommendation process is initiated to determine the appropriate corrective measure. The decision on its application is made by the Market Coupling Steering Committee (MCSC).
Intraday continuous market
In the intraday continuous market, Corrective Measures may be activated when a significant deterioration of system performance or a risk to the continuity of trade matching is detected.
Activation may occur, for example, in cases of:
- overload of the SIDC (XBID) platform,
- communication issues between local trading systems,
- or recurring difficulties in processing trade orders that endanger market stability.
In such cases, temporary measures may be introduced, such as limiting certain products or system functions. The decision is taken in coordination between NEMOs and TSOs and, similar to the auction markets, these measures are time-limited and will be announced to market participants in advance and published.
Corrective measure activation process
Once thresholds are exceeded, NEMOs, TSOs, National Regulatory Authorities and market participants are informed.
The measure must be published at least 7 days before activation.
Each measure is limited to a maximum of 8 months.
If the issue cannot be resolved, a proposal to amend the methodology will be prepared.
List of Corrective Measures
Day-ahead market
|
Name of the measure |
Description |
Status |
|
Reduce overall NEMO product usage down to Scalability Study upper limit |
Reduction of the number of accepted products in the Euphemia algorithm |
Not activated |
|
Remove Linked Block and Exclusive Group orders |
Deactivation of linked block and exclusive group orders |
Not activated |
|
Removal of Ramping from HVDC line sets |
Simplified modelling of transmission constraints |
Not activated |
SDAC parties common description of corrective measures can be found at this link.
Intraday continuous market
For the intraday continuous market, no corrective measures have been approved so far.
If any are defined and approved in the future, they will be announced in due time and published on this page.
Intraday auctions
For the intraday auctions, no corrective measures have been approved so far.
If any are defined and approved in the future, they will be announced in due time and published on this page.