Single Day-ahead Coupling (SDAC)
The aim of Single Day-ahead Coupling (SDAC) is to create a single pan European cross zonal day-ahead electricity market. SDAC allocates scarce cross-border transmission capacity in the most efficient way by coupling wholesale electricity markets from different regions through a common algorithm, simultaneously taking into account cross-border transmission constraints, and thereby maximizing social welfare.
An integrated day-ahead market increases the overall efficiency of trading by:
- promoting effective competition
- increasing liquidity
- enabling a more efficient utilization of the generation resources across Europe.
SDAC evolution and geographical scope
2014
February: launch of the North-Western Europe (NWE) Price Coupling operating under a common day-ahead power price calculation using the PCR solution. The same solution was also used at the same time in the South-Western Europe (SWE) region in a common synchronized mode. The first go-live of this coupling included the following countries: Belgium, Denmark, Estonia, Finland, France, Germany/Austria, Great Britain, Latvia, Lithuania, Luxembourg, the Netherlands, Norway, Poland (via the SwePol Link), Sweden, Portugal and Spain.
May: full coupling NWE and SWE via Multi Regional Coupling (MRC).
November: the 4M MC went live using the PCR solution. The following countries were part of the 4M MC: Czech Republic, Hungary, Romania and Slovakia.
2015
- February: Italy and Slovenia coupled with MRC.
2016
- January: Bulgaria joined MRC (isolated mode).
- February: Croatia joined MRC (isolated mode).
2018
- June: Croatia coupled with MRC.
- October: the Single Electricity Market on the island of Ireland coupled with MRC, split of the German-Austrian bidding zone into two separate ones.
2020
- December: Greece coupled with SDAC (MRC coupling).
2021
- January: EU-GB interconnectors and GB bidding zones exiting SDAC (MRC coupling).
- May: Bulgaria coupled with SDAC (MRC coupling).
- June: 4M MC and the MRC coupled via the borders PL-DE, PL-CZ, PL-SK, CZ-DE, CZ-AT and HU-AT.
- October: inclusion of the BG-RO border in the SDAC coupling.
2022
- June: he flow-based implicit allocation was implemented in the Core Capacity Calculation Region within the framework of the Core Flow-Based Market Coupling Project which was the target solution required by regulation.
- June: With the go-live of the Core flow-based project, the Croatian – Hungarian border was included in the SDAC coupling.
To accomplish SDAC, TSOs and NEMOs worked in close collaboration.
Involved parties
Transmission System Operators (TSOs):
50Hertz Transmission, ADMIE, Amprion, APG, AST, ČEPS, Creos, EirGrid, Elering, ELES, ELIA, Energinet, ESO, Fingrid, HOPS, Litgrid, MAVIR, PSE, REE, REN, RTE, SEPS, SONI, Statnett, Svenska Kraftnät, TenneT DE, TenneT NL, Terna, Transelectrica, and TransnetBW.
Nominated Electricity Market Operators (NEMOs):
BSP, CROPEX, SEMOpx (EirGrid and SONI), EPEX, EXAA, GME, HEnEx, HUPX, IBEX, Nord Pool, OMIE, OKTE, OPCOM, OTE, and TGE.
How does Single Day-Ahead Coupling work?
Day-ahead market coupling requires processing input from all involved NEMOs and TSOs – essentially bids and offers and network capacities and constraints – matching them by operating one single algorithm, and lastly validating and sending outputs, such as matched trades, clearing prices, and scheduled exchanges, to NEMOs and TSOs. These procedures occur within precise and tight timelines, while ensuring optimal economic solutions, high performance, and robustness.
Detailed explanation of Day-Ahead Coupling
The SDAC makes use of a common price coupling algorithm, called PCR EUPHEMIA, to calculate electricity prices across Europe and to implicitly allocate auction-based cross-border capacity.
Input data to PCR EUPHEMIA are the network capacities and constraints provided by the TSOs and the bids and offers provided by the NEMOs.
PCR EUPHEMIA matches energy demand and supply for a full 24 hour-period. The algorithm runs a combinatorial optimization process based on (i) the modelling of the matching problem (ii) the implementation of dedicated branch-and-bound strategies and (iii) the utilization of a standard optimization solver. The code of the algorithm uses Java and is interfaced with the matching system via an Oracle database.
This process maximizes social welfare (consumer surplus, supplier surplus and congestion rent) and takes into account price limits of orders and network constraints. The algorithm is designed to regard a large variety of orders and network features as well as local market rules.
Output data are clearing prices, matched trades, scheduled exchanges, and the net position of bidding areas.
Since its launch PCR EUPHEMIA has been continuously developed further. The most recent major development has been the integration of multi-NEMO requirements. With the latest release, smaller changes like shadow prices for maximum import/export allocation constraints and the calculation of aggregated curves have been implemented.
Market information
Statistics
- 98,6% of EU consumption is coupled
- 1.530 TWh/year coupled in one market solution
- 200 M€ average daily value of matched trades
- 17 minutes to solve a large and complex optimization problem
Graphical overviews on SDAC statistics
Overview on the allocation constraints used in SDAC
Overview of SDAC Nomination and generation deadlines
MCSC TSO Stand point and processes, 14:30-15:30
Future Development
PCR EUPHEMIA aims at full compliance with CACM. Furthermore, PCR EUPHEMIA is used in the context of Single Intraday Coupling for the execution of intraday auctions for the pricing of cross-border capacity (IDAs). Notwithstanding the important achievements of the PCR EUPHEMIA, cycles of Research and Development (R&D) are being executed in order to support further extensions of the market coupling, new market designs and a higher quality of performance, such as:
- Geographical extensions and market growth
- Switch from NTC to flow based capacity calculation
- 15 min Market Time Unit and cross matching
- CACM requirements to the Algorithm (adequate performance, scalability and repeatability)
- New NEMOs’ and new TSOs’ requirements
- Topology changes
The R&D program called Euphemia-Lab is a joint approach of NEMOs and TSOs with periodic reporting to institutions and stakeholders. The R&D program consists of researching a list of potential solutions to improve the target KPIs. Priority is given to improve implemented CACM requirements and the most problematic root cause of the numerical problems in EUPHEMIA. It is to be noted that research on a topic takes at least 6 months and subsequent integration into production takes at least one year.
Press Releases
Previous press releases
Information notes
- SDAC Report on the Partial Decoupling Incident, July 24th, 2024
- SDAC Report on the Partial Decoupling Incident, June 25th, 2024
- SDAC Decoupling Training Session
- The South West Europe Market Coupling Project announces the go-live of the Multi- NEMO Arrangement on the French side of the French - Spanish border in the Day-Ahead timeframe
- A Single Day-Ahead Market Coupling (SDAC) decoupling training session with market participants will be organised on 20 March 2024.
- SDAC report on the partial decoupling incident October 28th, 2023
- SDAC TSOs response to NEMOs consultation on 2nd auction
- SDAC report on the partial decoupling incident October 28th, 2023
- The Market Coupling Steering Committee (MCSC) initiated an in-depth investigation of the partial decoupling on the 28 of October
- SDAC decoupling training session conducted on 11 May 2023
- Co-optimization Roadmap Study
- Curtailment management in Single Day-Ahead Coupling
- No changes in harmonised maximum clearing price for SDAC from 20 September: it remains at 4,000 EUR/MWh
- Harmonised maximum clearing price for SDAC to be set to +5,000 EUR/MWh from 20th September
- SDAC report on the partial decoupling incident on 10th of May
- The Market Coupling Steering Committee (MCSC) initiated an in-depth investigation of the partial decoupling on 10th of May
- Harmonised maximum clearing price for SDAC to be set to + 4,000 EUR/MWh from 10th of May
- Progress of Joint Integration Testing, new Go-Live date for the Core Flow-Based Market Coupling project and Operational Webinar
Previous information notes
Postponement of the Core Flow-Based Market Coupling project Go-Live date of end of February 2022
SDAC Communication Note on the next training session on the 3rd November
Details of the SDAC webinar on the implementation of the DE-AT-PL-4M MC (Interim Coupling) Project
SDAC webinar on the implementation of the DE-AT-PL-4M MC (Interim Coupling) Project
SDAC report on the ‘partial decoupling’ incident of January 13th 2021
Information note on the partial decoupling of 13 January 2021
NEMOs and TSOs are safeguarding the Day-Ahead and Intraday market coupling
Report on the ‘partial decoupling’ incident of February 4th 2020
Initiation of the investigation of the partial decoupling on the 4th of February
DAY-AHEAD COUPLING: A TANGIBLE ACHIEVEMENT OF THE INTERNAL ELECTRICITY MARKET
Market reports
Joint Steering Committee meeting minutes
Previous meeting minutes
Publication of contracts
Publication of contracts according to article 20.7 of the Algorithm Methodology
According to article 20.7 of the Algorithm Methodology as approved by ACER all NEMOs shall in coordination with TSOs publish, by 1 September 2020, and then continuously update the relevant parts of the following documents:
a. operational contracts;
b. operational procedures;
c. change control procedures
d. monitoring procedures;
e. fallback procedures; and
f. back-up procedures.
These documents are published in accordance with article 20.7 of the Algorithm Methodology for transparency purposes. Any consultation or use of these documents is at your own risk and responsibility and the parties to the SDAC cooperation cannot be held liable for any damage incurred as a result of the use of these documents. Furthermore, these documents can only be used or quoted provided prior written consent is obtained of the parties to the SDAC cooperation. No rights or obligations can be derived from these documents. The publication of these documents does not affect any (intellectual) property right pertaining to these documents or to the information contained therein. The publication of these documents does not preclude the rights of the parties to the SDAC cooperation to amend, replace or suppress the documents.
Please note the following:
For reasons of confidentiality certain parts of the content of the documents have been blackened out or have not been published (e.g. Annex 5 of the DAOA).
Day-Ahead Operational Agreement (DAOA)
Annex 2: SDAC Operational Procedures – see separate list below
Annex 3: Change Control Procedure
Annex 4: Rules of Internal Order
Annex 6: Cost sharing, monitoring and settlement
Annex 7: Technical Readiness Definition
Annex 8: Simulation Facility Services
Annex 10: List of Parties and their status
Annex 11: Controller Information Clause
Annex 2: SDAC Operational Procedures
SDAC_BUP_01 - CZC and Allocation Constraints Submission
SDAC_BUP_02 - Final Confirmation of the Results
SDAC_FAL_01 - Incident Management
SDAC_FAL_03 - Partial Coupling
SDAC_NOR_01 - CZCs and Allocation Constraints Submission
SDAC_NOR_02 - Final Confirmation of the Results
SDAC_NOR_03 - Market Coupling Results and Scheduled Exchanges Transfer
SDAC_NOR_04 - Trading Confirmation and Scheduled Exchanges Notification
SDAC_OTH_01 - SDAC Procedures Reading Instructions
SDAC_OTH_02 - Internal and External Communications
SDAC_OTH_04 - Norwegian Bidding AreaChange
SDAC_OTH_06 - Modification of Maximum Clearing Price
SDAC_SPE_01 - Impact of Second Auctions
SDAC_SPE_02 - Impact of price limits in Nordic-Baltic reached