What Is Single Intraday Coupling (SIDC)?

The aim of the Single Intraday Coupling (SIDC) is to create a single EU cross-zonal intraday electricity market. In simple terms, buyers and sellers of energy (market participants) are able to work together across Europe to trade electricity continuously on the day the energy is needed.

An integrated intraday market makes intraday trading more efficient across Europe by:

  • promoting competition
  • increasing liquidity 
  • making it easier to share energy generation resources
  • making it easier for market participants to allow for unexpected changes in consumption and outages

As renewable intermittent production such as solar energy increases, market participants are becoming more interested in trading in the intraday markets. This is because it has become more challenging for market participants to be in balance (i.e. supplying the correct amount of energy) after the closing of the day-ahead market.

Being able to balance their positions until one hour before delivery time is beneficial for market participants and for the power systems alike by, among other things, reducing the need for reserves and associated costs while allowing enough time for carrying out system operation processes for ensuring system security. 

The Evolution Of SIDC And Its Geographical Scope

Single Intraday Coupling (SIDC) is a cooperation between Nominated Electricity Market Operators (NEMOs) and Transmission System Operators (TSOs) which enables continuous cross-border trading across Europe.

SIDC follows on from the XBID (Cross Border Intraday Project) which delivered, in June 2018, the first go-live of the intraday continuous trading platform. It allows energy networks to integrate via market coupling and to expand trading possibilities across Europe.

SIDC was launched on 12/13 June 2018 across 15 countries. In the first 16 months of operation over 25 million trades were completed across the countries involved. In November 2019 SIDC went live in seven further countries and in September 2021 one additional country joined, resulting in 23 countries being coupled. In November 2022 the fourth go-live wave was achieved with 2 more countries. In total, as of today, 25 countries are coupled.

The table below lists the countries of the first, second, third, and fourth waves. SIDC is in line with the CACM (Capacity Allocation and Congestion Management) EU Target model for an integrated intraday market. 


To accomplish SIDC, TSOs and NEMOs work in close collaboration.

Involved parties:

Transmission System Operators (TSOs):

50Hertz Transmission, ADMIE, Amprion, APG, AST, ČEPS, Creos, EirGrid, Elering, ELES, ELIA, ELSO, 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):


How Does Single Intraday Coupling work?

SIDC works on a common IT system with:

  1. a Shared Order Book (SOB),

  2. a Capacity Management Module (CMM), and

  3. a Shipping Module (SM).

This means that orders entered by market participants for continuous matching  in one country can be matched by orders submitted by market participants in any other country as long as they are both within the project’s reach and transmission capacity is available.

The intraday solution supports continuous trading that is both:

  • Explicit (capacity only. Note: only provided where requested by National Regulatory Authorities (NRAs) ie. at the French-German and the Croatian-Slovenian borders), and

  • Implicit (capacity and energy together)

When market participants of each NEMO submit orders, they are put together in one Shared Order Book (SOB). In a similar way, TSOs make available all the intraday cross-border capacities in the Capacity Management Module (CMM).  

This set-up allows NEMOs to operate their trading systems showing to market participants orders:

  1. Within the same NEMO

  2. From other NEMOs in the same market area

  3. From other market areas as long as there is enough capacity available

How Does Single Intraday Coupling work in detail?

When a market participant submits an order for a different market area, it can be matched (i.e. met) as long as there is enough transmission capacity available. To match an order simply means that the market participant can meet and supply the energy demand.

А trade is concluded on a first-come-first-served principle where the highest buy price and the lowest sell price get served first.

Updating the SOB and CMM

When the order can be matched, the order matching is associated with implicit capacity allocation (this is when capacity and energy are priced together). While two orders are being matched, the SOB and CMM are updated immediately. 

The update of the SOB means that the matched orders are removed from the SOB, and consequently the available transmission capacity in the CMM is updated. The number of borders that have their capacities updated depends on where the matched orders are located.

How is data about trades used?

The Shipping Module (SM) receives data from the SOB about all trades when they are concluded. These can be:

  • Between two different delivery areas, and

  • In the same delivery area between two different NEMOs.

The Shipping Module (SM) of the SIDC solution provides information from concluded trades to all relevant parties such as NEMOs and TSOs.

The data from the SOB and the CMM is enhanced with data from:

  • The relevant TSO,

  • The Central Counter Party (CCP), and

  • Shipping agent data from the Shipping Module (SM).

This enhanced data is then sent to relevant parties such as the NEMOs and TSOs at the configured moments.

Continuous trading matching algorithm public description

Market information

Products Available

You can read what specific products are available in different market areas in the table below.


Size: minimum volume increment 0,1 MW
Price tick: EUR 0,01/ MWh
Volume range: from 0,1 MW to 999MW
Price range: from -9999 EUR/MWh to 9999 EUR/MWh,

60-min products are available in every SIDC country.

30-min products are currently tradable across the borders FR-DE, DE-NL, DE-BE, FR-BE and BE-NL.

15-min products are currently tradable across the borders BE-NL, BE-DE, NL-DE, AT-DE, AT-HU, AT-SI, HU-RO, BG-RO, SK-HU, HU-SI, HR-HU and HR-SI.

15-min products are available within DK, SE, Fi internal bidding zones, but not cross-zone / cross-border.

The availability of 15 minute products across other market areas will further expand in the future.

Stakeholder reports

To give stakeholders a comprehensive overview of the benefits SIDC delivers, the project has prepared reports featuring several indicators including amongst others traded volumes, average prices, cross-border capacity utilisation, share of cross-bidding zone trades in overall volumes and availability of the SIDC platform. These reports cover the operational period since beginning of January 2019.

  • For the period January 2019 until end of 2020 half-yearly reports are available.

  • As of April 2021 the reports are available on a monthly basis.

  • In the Q3/Q4 2020 report some indicators are calculated until end of March 2021.


January - February - March - April


January - February - March - April - May - June - July - August - September - October - November - December


January - FebruaryMarchAprilMayJune - July - August - September October - November - December


April - May - June - July - AugustSeptemberOctoberNovember - December


Q1/Q2 report - Q3/Q4 report


Q1/Q2 report - Q3/Q4 report

Algorithm monitoring

Pursuant to Article 8 of Annex I of ACER decision 04/2020 on the Algorithm methodology, SI

Number of trades per quarter


Number of trades

Mid-June to September 2018

3.5 million

October to December 2018

4.3 million

January to March 2019

4.8 million

April to June 2019

5.8 million

July to September 2019

5.6 million

October to December 2019

7.2 million

January to March 2020

8.3 million

April to June 2020

9.3 million

July to September 2020

10.8 million

October to December 2020

11.9 million

January to March 2021

12.7 million

April to June 2021

14.9 million

July to September 2021

15.4 million

October to December 2021

18.0 million

January to March 2022

18.5 million

April to June 2022

20,8 million

July to September 2022

22,2 million

October to December 2022

26,96 million

January to March 2023

34,22 million

April to June 2023

36,58 million

July to September 2023

38,47 million

October to December 2023

45,41 million

SIDC has developed algorithm monitoring reports, which will be generated on a monthly basis. These reports contain among others key indicators on the performance of the algorithm, prices, matched orders and volumes and the usage of SIDC products.


January - February - March - April 


January - February - March - April - May - June - July - August - September - October - November - December


JanuaryFebruaryMarchAprilMayJune - July - August - September - October - November - December



Future Development

The development of SIDC is a priority to all parties (NEMOs and TSO) involved in the project. Here we list future developments to expand and improve the efficiency of the SIDC.

  1. Plans are underway to integrate cross-zonal capacity pricing through intraday auction in line with ACER’s decision on establishing a single methodology for pricing intraday cross-zonal capacity.

  2. Plans are underway to implement the functionality to address losses on HVDC cables.

  3. SIDC has initiated the R&D phase for the implementation of flow-based allocation in continuous trading

Press releases

24 June 2024: European Energy Market Milestone: Intraday Auctions (IDAs) Successfully Implemented

14 June 2024: Intraday Auctions (IDAs) were implemented across Europe on 13 June 2024

29 May 2024: Confirmation of the go-live date for Intraday Auctions (IDAs)

23 May 2024: Successful go-live for Bursa Romana de Marfuri (BRM)

22 March 2024: SIDC held a pre-launch event about new Intraday Auction

12 January 2024: SIDC announces the successful launch of 15-minute MTU capacity allocation on HR-SI and HR-HU borders

28 November 2023: Successful test of 15-minute MTU capacity allocation on HR-SI and HR-HU borders

2 August 2023: Successful go-live for ETPA

28 July 2023: Confirmation of go-live date for ETPA

25 March 2021: Revised Go-Live for SIDC integration of Italy and new SIDC Release

24 November 2020: Expansion of 30 and 15 minute products and Revised Local Implementation Project 14 Go-Live

28 November 2019: Successful 2nd wave go-live on SIDC

14 June 2018: XBID Go-Live

Publication of Intraday Operational Agreements 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

f.    Back-up procedures.

Based on this regulatory requirement SIDC parties publish these documents for transparency purposes. Any consultation or use of these documents is at your own risk and responsibility and the parties to the SIDC 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 SIDC 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 SIDC cooperation to amend, replace or suppress the documents.

Please note the following:

1.   For reasons of confidentiality certain parts of the content of the documents have been blackened out or have not been published (e.g. Exhibit 2, 13, 15 of the IDOA).

2.   Exhibit 3 (Change Control Procedure), Exhibit 18 (OTH07-Algorithm monitoring procedure) and the related definitions in Exhibit 1 (Definition List) of the IDOA are to be adapted to reflect the relevant provisions of the Algorithm Methodology. For transparency reasons these documents are published subject to the reservation that they are still to be formally adopted by the parties to the SIDC cooperation via the signature of the Second IDOA Amendment.

SIDC Joint Documentation

Intraday Operational Agreement (IDOA)

IDOA main text

IDOA 2nd amendment

IDOA 3rd amendement

Exhibit 1 - Definitions List

Exhibit 3_- Change Control Procedure 

Exhibit 4 - High Level Architecture

Exhibit 5 - Exchange of rack space

Exhibit 6 – Operational procedures – see separate list below

Exhibit 7 - Technical Readiness

Exhibit 8 _List of Parties participating in the Initial Go-Live

Exhibit 9 List of jointly owned developments

Exhibit 10 - RIO

Exhibit 11 Accession Form

Exhibit 12 Costs sharing monitoring and settlement

Exhibit 14 Principles voluntary exit

Exhibit 16 Rollback

Exhibit 17: Includes XBID_JOINT_NOR_03 and XBID_JOINT_NOR_04 included also below under the procedures overview

Exhibit 18 Algorithm Monitoring Procedure

Exhibit 19 General Data Protection

Exhibit 20: Statistical data

6_Exhibit 6 – Joint XBID Procedures

XBID_JOINT_BUP_02 - Distribution of allocation information

XBID_JOINT_CFG_01-SM Configuration

XBID_JOINT_EXC_01 - Closing and re-opening of an Interconnector

XBID_JOINT_FAL_01 - Incident Management

XBID_JOINT_NOR_02 - Distribution of allocation information

XBID_JOINT_NOR_03 - Nomination

XBID_JOINT_NOR_04 - Nomination on behalf

XBID_JOINT_OTH_01 - Procedures Reading Instructions

XBID_JOINT_OTH_02 - Internal and External Communications

XBID_JOINT_OTH_05 - System Maintenance

XBID_JOINT_OTH_06 - Planned Maintenance Window Local Shipper System

SIDC_JOINT_OTF_07: Algorithm Monitoring Procedure  included under Exhibit 18

SIDC_JOINT_OTF_08 Transit shipping 

SIDC TSO only documentation

TSO Cooperation Agreement for Single Intraday coupling (TCID)

Main body (consolidated version with 1st amendment)

APPENDIX A - Definitions

APPENDIX C - Accession Form

APPENDIX D - TSO-only operational procedures

APPENDIX E - TSO Change Control Procedure

APPENDIX F - Rules of Internal Order

APPENDIX G - Cost sharing monitoring and settlement


APPENDIX D - TSO operational procedures

XBID_TSO_BUP_01 - Submission of Cross Zonal Capacities

XBID_TSO_CFG_01 - CMM - Balancing Group and User Management

XBID_TSO_CFG_02 - CMM - Master Data Management

XBID_TSO_NOR_01 - Submission of Cross Zonal Capacities

XBID_TSO_NOR_05 - Allocation on Behalf

XBID_TSO_OTH_03 - TSO Change Control Procedure.pdf

XBID_TSO_OTH_04 - Maintenance Window Local TSO System

SIDC NEMO Only Documentation


ANIDOA Initial version

Main body

ANIDOA_Annex 01 - Definition list

ANIDOA_Annex 02 - Identical NEMO components

ANIDOA_Annex 03 - Financial modalities

ANIDOA_Annex 04 - Contact and invoicing details

ANIDOA_Annex 05 - Procurement procedure

ANIDOA Annex 07 – Operational procedures – see separate below

ANIDOA_Annex 06 - Technical requirements_clean

ANIDOA_Annex 08 - NEMO Central Admin Services

ANIDOA_Annex 09 - RIO

ANIDOA_Annex 10 - Accession Declaration Form

ANIDOA_Annex 11 - CCP

published July 1 2022

ANIDOA Annex 07 – Operational procedures




XBID_NEMO_CFG_01-SOB Configurations

XBID_NEMO_CFG_01-SOB Configurations_redacted

XBID_NEMO_EXC_01-Trade recall_redacted


XBID_NEMO_EXC_01-Trade recall_redacted

XBID_NEMO_EXC_03 - Market suspension and reactivation

XBID_NEMO_EXC_03 Market Suspension and Reactivation update-10-2020

XBID_NEMO_EXC_03 - Market suspension and reactivation_redacted

XBID_NEMO_NOR_01 - Transaction_process

XBID_NEMO_NOR_01 - Transaction_process_redacted

XBID_NEMO_OTH_02 - Internal and External Communications

XBID_NEMO_OTH_02 Internal and External Communications - update-10-2020

XBID_NEMO_OTH_02 - Internal_and_External_Communications_redacted


XBID_NEMO_OTH_03 – XBID NEMO Admins – update 10-2020

XBID_NEMO_OTH_03 - XBID NEMO Admins_redacted

XBID_NEMO_OTH_04 - MPLS Incident Management

XBID_NEMO_OTH_04 - MPLS Incident Management_redacted

XBID_NEMO_OTH_06 - XBID Coordinator Calendar

Xbid_NEMO_OTH_06-XBID_CoordinatorCalendar-update 1-2021

XBID_NEMO_OTH_06 - XBID Coordinator Calendar_redacted

ANIDOA First Amendment

First Amendment ANIDOA

Annex 1 First ANIDOA Amendment_updated Annex 1

Annex 2 First ANIDOA Amendment -updated Annex 3

Annex 3 First ANIDOA Amendment_updated Annex 5

Annex 4 First ANIDOA Amendment_updated Annex 9

Annex 5 First ANIDOA Amendment_updated Annex 10

Annex 6 First ANIDOA Amendment_updated Annex 11

Annex 7 First ANIDOA Amendment_consolidated ANIDOA