Dear Market Participants,
Hereby, the Single Day Ahead Coupling (SDAC) parties would like to invite you to an SDAC decoupling training session, which will be held on 03/06/2026.
BACKGROUND
Since the go-live of Multi Regional Coupling (MRC, jointly with 4M MC forming SDAC) in 2014, more than 4,300 successful market coupling sessions have been conducted. In the last 12 years, seven major incidents have happened that led to a partial decoupling from the SDAC Market. As part of the SDAC evaluation of these incidents, recommendations have been made to perform training sessions involving all operational parties (Transmission System Operators [TSOs], Nominated Electricity Market Operators [NEMOs], Central Counter Parties, Shadow Auction entity, etc.) including Market Participants.
OBJECTIVE
This training session is organized to give all parties involved the opportunity to validate that they are properly prepared to handle such a day-ahead Full Decoupling incident in real operations and real-life conditions following simulation timings.
SCENARIO
The SDAC parties are preparing a scenario that simulate current market circumstances and involves a Full Decoupling. On this occasion, a new message (SDAC_ExC_07) will be sent to the market to cancel previously published Preliminary Market Coupling Results and inform about a new calculation process, due to party rejection. At Full Decoupling deadline, no SDAC market coupling results will be available, but local auctions/regional coupling will be triggered depending on the specific region. For your convenience, the session will take place outside of the usual SDAC operational timings in order not to interfere with ongoing operations.
The TSOs, NEMOs, and the Joint Allocation Office (JAO) will handle the situation in line with operational procedures. More specifically, shadow auctions will be run by JAO and local auction/regional coupling will be run by the NEMOs after the Full Decoupling. Market Participants are expected to respond and act, based on the operational messages from their respective NEMOs and JAO, exactly like in real operations. The complete process chain will be addressed (incl. nomination and matching, unless explicitly stated otherwise in respective regions).
PLEASE NOTE
The entire training session will take place in a simulation environment. All operational messages from involved parties will be explicitly marked as "SIMULATION" messages. Please make sure that your operational staff present on 03/06/2026, whether you are participating or not, is aware that this training is scheduled and that messages related to it are sent out. This is important to prevent any type of misunderstanding that could impact the processes in production.
Members wishing to participate should review their preparedness and the deadlines below:
NEXT STEPS
• 07/05: Distribution of detailed information package to the Market Participants together with new version of the SDAC Fallback Manual (third version):
SDAC Information Package provides an overview of the test specific timings and messages our members can expect during the Full Decoupling Training Session with Market Participants on 03/06/2026:
https://www.nemo-committee.eu/assets/files/decoupling-training-session-with-market-participants-3rd-june-2026.pdf
The Fallback Manual describes SDAC production operational timings; provides an overview of all messages, including applied code changes and the newly introduced SDAC_ExC_07 message; and details the rules, partial and full decoupling mechanisms, and fallback solutions for each region:
https://www.nemo-committee.eu/assets/files/sdac-fallback-manual-v12-and-v13.pdf
Please note that the published manual covers the current version valid until 19.05.2026 and a revised version applicable from 20.05.2026.
• 26/05: Market Participant registration deadline towards its JAO.
For members intending to participate in the shadow auction allocation, registration with JAO is mandatory.
Please ensure you have an active test user in the Member Test (MT) environment for the Product ID(s) listed below:
o NOR_QH_DA_1
o CWE_QH_DA_1
o PL_QH_DA_1
If you are unsure, please contact us at [email protected].
• 03/06: Execution of the full decoupling training session.
• 10/06: Collection of market participants’ feedback on the training session.
Looking forward to a productive and constructive session together!
Kind regards,
Hereby, the Single Day Ahead Coupling (SDAC) parties would like to invite you to an SDAC decoupling training session, which will be held on 03/06/2026.
BACKGROUND
Since the go-live of Multi Regional Coupling (MRC, jointly with 4M MC forming SDAC) in 2014, more than 4,300 successful market coupling sessions have been conducted. In the last 12 years, seven major incidents have happened that led to a partial decoupling from the SDAC Market. As part of the SDAC evaluation of these incidents, recommendations have been made to perform training sessions involving all operational parties (Transmission System Operators [TSOs], Nominated Electricity Market Operators [NEMOs], Central Counter Parties, Shadow Auction entity, etc.) including Market Participants.
OBJECTIVE
This training session is organized to give all parties involved the opportunity to validate that they are properly prepared to handle such a day-ahead Full Decoupling incident in real operations and real-life conditions following simulation timings.
SCENARIO
The SDAC parties are preparing a scenario that simulate current market circumstances and involves a Full Decoupling. On this occasion, a new message (SDAC_ExC_07) will be sent to the market to cancel previously published Preliminary Market Coupling Results and inform about a new calculation process, due to party rejection. At Full Decoupling deadline, no SDAC market coupling results will be available, but local auctions/regional coupling will be triggered depending on the specific region. For your convenience, the session will take place outside of the usual SDAC operational timings in order not to interfere with ongoing operations.
The TSOs, NEMOs, and the Joint Allocation Office (JAO) will handle the situation in line with operational procedures. More specifically, shadow auctions will be run by JAO and local auction/regional coupling will be run by the NEMOs after the Full Decoupling. Market Participants are expected to respond and act, based on the operational messages from their respective NEMOs and JAO, exactly like in real operations. The complete process chain will be addressed (incl. nomination and matching, unless explicitly stated otherwise in respective regions).
PLEASE NOTE
The entire training session will take place in a simulation environment. All operational messages from involved parties will be explicitly marked as "SIMULATION" messages. Please make sure that your operational staff present on 03/06/2026, whether you are participating or not, is aware that this training is scheduled and that messages related to it are sent out. This is important to prevent any type of misunderstanding that could impact the processes in production.
Members wishing to participate should review their preparedness and the deadlines below:
NEXT STEPS
• 07/05: Distribution of detailed information package to the Market Participants together with new version of the SDAC Fallback Manual (third version):
SDAC Information Package provides an overview of the test specific timings and messages our members can expect during the Full Decoupling Training Session with Market Participants on 03/06/2026:
https://www.nemo-committee.eu/assets/files/decoupling-training-session-with-market-participants-3rd-june-2026.pdf
The Fallback Manual describes SDAC production operational timings; provides an overview of all messages, including applied code changes and the newly introduced SDAC_ExC_07 message; and details the rules, partial and full decoupling mechanisms, and fallback solutions for each region:
https://www.nemo-committee.eu/assets/files/sdac-fallback-manual-v12-and-v13.pdf
Please note that the published manual covers the current version valid until 19.05.2026 and a revised version applicable from 20.05.2026.
• 26/05: Market Participant registration deadline towards its JAO.
For members intending to participate in the shadow auction allocation, registration with JAO is mandatory.
Please ensure you have an active test user in the Member Test (MT) environment for the Product ID(s) listed below:
o NOR_QH_DA_1
o CWE_QH_DA_1
o PL_QH_DA_1
If you are unsure, please contact us at [email protected].
• 03/06: Execution of the full decoupling training session.
• 10/06: Collection of market participants’ feedback on the training session.
Looking forward to a productive and constructive session together!
Kind regards,
Nord Pool desk
| T: +47 6710 9110 (Day-ahead desk) | E: [email protected] |
| T: +47 6710 9115 (Intraday desk) | E: [email protected] |