What is Single Intraday Coupling (SIDC)?

Single Intraday Coupling (SIDC) creates 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. 


Learn more about the single intraday coupling (SIDC) 


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How Single Intraday Coupling began

Single Intraday Coupling (SIDC) is an initiative 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 and expand 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 and September 2021, SIDC went live across a further eight countries resulting in 23 countries being coupled. 

SIDC is in line with the CACM (Capacity Allocation and Congestion Management) EU Target model for an integrated intraday market. 


SIDC Geographical Scope and Future Go-Live Waves

SIDC will expand in several phases, also referred to as “waves”. The map below shows the geographic spread of the first, second and third waves which have been implemented. Further waves are planned and the scope may expand beyond that shown.



The first go-live wave was in June 2018 and included 15 countries. A second go-live with seven further countries was achieved in November 2019, a third go-live including Italy in September 2021. The table below lists the countries of the first, second and third waves.          

First Go-Live in June 2018

  Second Go-Live in November 2019  

 15 countries

 7 countries

 Austria

 Bulgaria 

 Belgium

 Croatia 

 Denmark

 Czech-Republic

 Estonia

 Hungary

 Finland

 Poland

 France

 Romania

 Germany

 Slovenia

 Latvia


 Lithuania


 Luxembourg

    Third Go-Live in September 2021

 Norway

 Italy

 The Netherlands


 Portugal


 Spain


 Sweden



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


The organisations involved are:

Transmission System Operators (TSOs):

50HERTZ, ADMIE, AMPRION, APG, AST, ČEPS, CREOS, EirGrid, ELERING, ELES, ELIA, ELSO, 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, EirGrid, EPEX SPOT, GME, HEnEx, HUPX, IBEX, Nord Pool, OKTE, OMIE, OPCOM, OTE, SONI and TGE.


Governance Structure

The governance of the SDAC consists of three layers, which are governed by separate agreements.

  • Joint NEMOs and TSOs: governed by the Single Day-Ahead Coupling Operations Agreement (DAOA);
  • Only NEMOs: governed by the All NEMO Day Ahead Operation Agreement (ANDOA);
  • Only TSOs: governed by the TSO Cooperation Agreement for Single Day-Ahead Coupling (TCDA).

The governance of the SIDC consists of three layers, which are governed by separate agreements.

  • Joint NEMOs and TSOs: governed by the Intraday Operation Agreement (IDOA)
  • Only NEMOs: governed by the ALL NEMO-Intraday Operation Agreement (ANIDOA)
  • Only TSOs: governed by the Transmission Cooperation Agreement (TCID)

In January 2022, a new joint governance structure was implemented in order to achieve a better cooperation between NEMOs and TSOs in the SIDC and SDAC projects. All NEMOs and TSOs have been working intensely over recent years to achieve a truly integrated European electricity market. By integrating the decision making for both the day-ahead and intraday timeframe, the new structure will ensure further coordination, foster efficiency and create a faster decision-making mechanism.

Therefore, the principles of the governance structure have not been changed, it is headed by a Market Coupling Steering Committee (MCSC) that includes representative of all parties involved.

MCSC activities are supported by horizontal joint groups which address the legal and communication aspects of the couplings. In addition, on the SDAC side, there are four joint groups which deal with the following: Market and System Design, Procedures and Operation, Simulation Facility, and 15min ICG. On the SIDC side three there are joint groups dealing with: Operations (OPSCOM) and Change Control, Quality Assurance and Release Management (QARM), and Market and System Design (MSD).


How Single Intraday Coupling works

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 allows NEMOs to operate trading systems to show orders to market participants from other market participants in three groups:

  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


Learn more about how single intraday coupling works in detail


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How Single Intraday Coupling works 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 capacity available. To match an order simply means that the market participant can meet and supply the energy demand.

Trade is done 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 data about trades is 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.


Market information

Products Available

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


 


30-min products are currently tradable across the borders FR-DE, 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 and HU-RO.

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


Number of trades per quarter

From mid-June to 2018 to end of Q3 2021,114 million trades have occurred through SIDC.



Period

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


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.

November 2021

October 2021

September 2021

August 2021

July 2021

June 2021

May 2021

April 2021

Q3/Q4 2020 report (some indicators are calculated until end of March 2021)

Q1/Q2 2020 report

Q3/Q4 2019 report

Q1/Q2 2019 report


Algorithm monitoring

Pursuant to Article 8 of Annex I of ACER decision 04/2020 on the Algorithm methodology, SIDC has developed algorithm monitoring reports, which will be generated on a monthly basis. These reports contain amongst others key indicators on the performance of the algorithm, prices, matched orders and volumes and the usage of SIDC products.

2021 August

2021 July

2021 June

2021 May


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. SIDC is working on the implementation of cross-product matching. This will enable the matching of different products with one another (for example 15 min with 60 min orders).

  3. SIDC is currently closely working together with SDAC to establish a joint governance between the projects. This initiative aims at delivering a joint decision-making body, which will be responsible for both projects, as well as the merger of the legal and communication working groups. The go-live of the joint governance setup is planned in Q1 2022

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

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


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

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

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

XBID_JOINT_CFG_01 SM Configuration


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 H - List of SLAs

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_NOR_01 - Submission of Cross Zonal Capacities

XBID_TSO_NOR_05 - Allocation on Behalf

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

ANIDOA Annex 07 – Operational procedures

XBID_NEMO_BUP_01-Transaction_Process

XBID_NEMO_BUP_01_Transaction_Process-update-10-2020

XBID_NEMO_CFG_01-SOB Configurations


XBID_NEMO_EXC_01-Trade recall_redacted

XBID_NEMO_EXC_01_Trade-recall-update-10-2020

XBID_NEMO_EXC_03 - Market suspension and reactivation

XBID_NEMO_EXC_03 Market Suspension and Reactivation update-10-2020

XBID_NEMO_NOR_01 - Transaction_process


XBID_NEMO_OTH_02 - Internal and External Communications

XBID_NEMO_OTH_02 Internal and External Communications - update-10-2020

XBID_NEMO_OTH_03 - XBID NEMO Admins

XBID_NEMO_OTH_03 – XBID NEMO Admins – update 10-2020

XBID_NEMO_OTH_04 - MPLS Incident Management


XBID_NEMO_OTH_06 - XBID Coordinator Calendar

Xbid_NEMO_OTH_06-XBID_CoordinatorCalendar-update 1-2021


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


ANDOA BUP

ANDOA_BUP_01-Configuration Synchronization_redacted

ANDOA_BUP_02-Network Data Sending and Receiving_redacted

ANDOA_BUP_03-Order Data Sending and Receiving_redacted

ANDOA_BUP_04-Calculation Process_redacted

ANDOA_BUP_05-Results Sharing  and Receiving_redacted

ANDOA_BUP_06-Preliminary Confirmation of the Results_redacted

ANDOA_BUP_07-Final Confirmation of the Results_redacted

ANDOA_BUP_08-Daily Report and Euphemia Session Dump_redacted


ANDOA EXC / FAL

ANDOA_EXC_03-Thresholds and Curtailments Reached_redacted

ANDOA_EXC_08-Maximum Clearing Price management in SDAC_redacted

ANDOA_FAL_01-Incident Committee_redacted

ANDOA_FAL_02-Partial and Full Decoupling_redacted



ANDOA NOR

ANDOA_NOR_01-Configuration Synchronization_redacted

ANDOA_NOR_02-Network Data Sending and Receiving_redacted

ANDOA_NOR_03-Order Data Sending and Receiving_redacted

ANDOA_NOR_04-Calculation Process_redacted

ANDOA_NOR_05-Results Sharing and Receiving_redacted

ANDOA_NOR_06-Preliminary Confirmation of the Results_redacted

ANDOA_NOR_07-Final Confirmation of the Results_redacted

ANDOA_NOR_08-Daily Report and Euphemia Session Dump_redacted

ANDOA_NOR_09-Time to first solution gathering_redacted

ANDOA_OPE_04-Internal and External Communications_redacted


XBID

XBID_NEMO_BUP_01-Transaction_Process_redacted

XBID_NEMO_CFG_01-SOB Configurations_redacted

XBID_NEMO_EXC_01-Trade recall_redacted​​​​​​​

XBID_NEMO_EXC_03 - Market suspension and reactivation_redacted

XBID_NEMO_NOR_01 - Transaction_process_redacted

XBID_NEMO_OTH_02 - Internal_and_External_Communications_redacted

XBID_NEMO_OTH_03 - XBID NEMO Admins_redacted

XBID_NEMO_OTH_04 - MPLS Incident Management_redacted

XBID_NEMO_OTH_06 - XBID Coordinator Calendar_redacted