All TSOs’ proposal for amendment of the methodology for calculating scheduled exchanges in accordance with Article 41 of the CACM

Closed 8 Jan 2024

Opened 30 Nov 2023


The methodology for Day-Ahead Scheduled Exchanges Calculation (DA SEC) is developed pursuant to art. 43 of Commision Regulation (EU) 2015/1222 of 24 July 2015 .

The methodology for DA SEC describes the optimization problem integrated in price coupling algorithm (Euphemia), and DA SEC determines commercial flows on bidding zone borders  constrained by the net positions determined in the previous market coupling step in Euphemia.
As an integral part of the Euphemia algorithm, DA SEC influences the total computation time of the algorithm. Performance improvements in the DA SEC process will enable a reduction of the total computation time of Euphemia, and in the end in extreme cases prevent decoupling.

Before switching the MTU resolution in SDAC from 60 minutes to 15 minutes, the Euphemia algorithm needs to have its’ performance improved to cope with increased amount of data in limited time available for calculation.
Consequently, the DA SEC methodology will need to be amended in due time for 15 minutes MTU go-live. The amendment proposal therefore contains the addition of a so-called back-up calculation in DA SEC methodology, by replacing the quadratic term and thereby linearizing the objective function. The back-up calculation will only be activated if the Euphemia algorithm cannot find a solution in a reasonable time.

Therefore, ENTSO-E launches a public consultation on the proposal for amendment of the day-ahead scheduled exchanges methodology.

Why your views matter

We are seeking input and feedback from relevant stakeholders, market participants, NRAs and NEMOs for the proposal for amendment of the methodology for Day-Ahead Scheduled Exchanges Calculation.


  • ENTSO-E stakeholders


  • Market Network Codes