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:
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.
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.
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):
BSP, CROPEX, EirGrid, EPEX SPOT, GME, HEnEx, HUPX, IBEX, Nord Pool, OKTE, OMIE, OPCOM, OTE, SONI, TGE, ETPA and BRM.
SIDC works on a common IT system with:
a Shared Order Book (SOB),
a Capacity Management Module (CMM), and
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:
Within the same NEMO
From other NEMOs in the same market area
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.
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
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 999 MW
Price range: from -9999 EUR/MWh to 9999 EUR/MWh,
15-min Products
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.
30-min Products
30-min products are currently tradable across the borders FR-DE, DE-NL, DE-BE, FR-BE and BE-NL.
60-min Products
60-min products are available in every SIDC country.
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 |
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 |
January to March 2024 | 47.89 million |
Total: | 348.48 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 utilization, 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.
2024
January - February - March - April
2023
January - February - March - April - May - June - July - August - September - October - November - December
2022
January - February – March – April – May – June - July - August - September - October - November - December
2021
April - May - June - July - August – September – October – November - December
2020
2019
Algorithm Monitoring Reports
Pursuant to Article 8 of Annex I of ACER decision 04/2020 on the Algorithm methodology, SIDC has developed algorithm monitoring reports, which are 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.
2024
January - February - March - April
2023
January - February - March - April - May - June - July - August - September - October - November - December
2022
January – February – March – April – May – June - July - August - September - October - November - December
2021
May – June – July – August – September – October – November – December
IDA Reports
The development of SIDC is a priority to all parties (NEMOs and TSOs) involved in the project. Here we list future developments to expand and improve the efficiency of the SIDC.
Plans are underway to implement the functionality to address losses on HVDC cables.
SIDC has initiated the R&D phase for the implementation of flow-based allocation in continuous trading
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
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
28 November 2019: Successful 2nd wave go-live on SIDC
27 August 2024: SIDC Report on Critical Incident Experienced on 21st of May 2024
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) | |
Exhibit 6 – Operational procedures – see separate list below | |
Exhibit 8 _List of Parties participating in the Initial Go-Live | |
Exhibit 17: Includes XBID_JOINT_NOR_03 and XBID_JOINT_NOR_04 included also below under the procedures overview | |
6_Exhibit 6 – Joint XBID Procedures | |
XBID_JOINT_EXC_01 - Closing and re-opening of an Interconnector | |
XBID_JOINT_OTH_06 - Planned Maintenance Window Local Shipper System | |
SIDC_JOINT_OTF_07: Algorithm Monitoring Procedure included under Exhibit 18 | |
SIDC TSO only documentation
TSO Cooperation Agreement for Single Intraday coupling (TCID) | |
APPENDIX D - TSO-only operational procedures | |
APPENDIX D - TSO operational procedures | |
SIDC NEMO Only Documentation
ANIDOA Initial version | |||
ANIDOA Annex 07 – Operational procedures – see separate below | |||
published July 1 2022 | |||
ANIDOA Annex 07 – Operational procedures | |||
XBID_NEMO_EXC_03 Market Suspension and Reactivation update-10-2020 | XBID_NEMO_EXC_03 - Market suspension and reactivation_redacted | ||
XBID_NEMO_OTH_02 Internal and External Communications - update-10-2020 | XBID_NEMO_OTH_02 - Internal_and_External_Communications_redacted | ||
ANIDOA First Amendment | |
