Single Intraday Coupling (SIDC)
What is Single Intraday Coupling?
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.
1 st wave June 2018
- Austria
- Belgium
- Denmark
- Estonia
- Finland
- France
- Germany
- Latvia
- Lithuania
- Luxembourg
- Norway
- The Netherlands
- Portugal
- Spain
- Sweden
2 nd wave November 2019
- Bulgaria
- Croatia
- Czech-Republic
- Hungary
- Poland
- Romania
- Slovenia
3 rd wave September 2021
- Italy
4 th wave November 2022
- Greece
- Slovakia
Governance Structure
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):
BSP, CROPEX, EirGrid, EPEX SPOT, GME, HEnEx, HUPX, IBEX, Nord Pool, OKTE, OMIE, OPCOM, OTE, SONI, TGE, ETPA and BRM.
How does SIDC work?
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 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 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 transmission capacity available. To match an order simply means that the market participant can meet and supply the energy demand.
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 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
Available products by market are listed in the table below.
Products | Austria | France | German TSO areas | Iberia | NL & Belgium | Finland | Sweden | Denmark | Norway | Baltics | Bulgaria | Croatia | Czech Rep. | Hungary | Poland | Romania | Slovenia | Italy | Slovakia | Greece |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
15 min | X | X | X | X | X | X | X | X | X | X | X | X | ||||||||
30 min | X | X | X | |||||||||||||||||
60 min | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X |
User defined blocks (hourly) | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X |
- 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
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.
Q1 | Q2 | Q3 | Q4 | |
---|---|---|---|---|
2018 | 3,50 | 4,30 | ||
2019 | 4,80 | 5,80 | 5,60 | 7,20 |
2020 | 8,30 | 9,30 | 10,80 | 11,90 |
2021 | 12,70 | 14,90 | 15,40 | 18,00 |
2022 | 18,50 | 20,80 | 22,20 | 26,96 |
2023 | 34,22 | 36,58 | 38,47 | 45,41 |
2024 | 47,89 | 53,47 | ||
Total | 477,00 |
Resources Available
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.
- 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.
2024 Jan - Feb - Mar - Apr - May - Jun
2023 Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec
2022 Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec
2021 Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec
2020 Q1/Q2 report - Q3/Q4 report
2019 Q1/Q2 report - Q3/Q4 report
Overview of Allocation Constraints in SIDC
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 are 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.
2024 Jan - Feb - Mar - Apr - May - Jun
2023 Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec
2022 Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec
2021 May - Jun - Jul - Aug - Sep - Oct - Nov - Dec
IDA Reports
2024 IDA weekly reports
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.
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
Resources Available
Steering Committee Minutes
Previous Steering Committee Minutes
- 24 November 2021 SIDC IDSC
- 27 October 2021 SIDC IDSC
- 30 September 2021 SIDC IDSC
- 26 August 2021 SIDC IDSC
- 15 July 2021 SIDC IDSC
- 16 June 2021 SIDC IDSC
- 11 May 2021 SIDC IDSC
- 14 April 2021 SIDC IDSC
- 11 March 2021 SIDC IDSC
- 9 February 2021 SIDC IDSC
- 3 December 2020 SIDC IDSC
- 10 November 2020 SIDC IDSC
- 6 October 2020 SIDC IDSC
- 9 September 2020 SIDC IDSC
- 5 August 2020 SIDC IDSC
- 7 July 2020 SIDC IDSC
- 9 June 2020 SIDC IDSC
- 5 May 2020 SIDC IDSC
- 1 April 2020 SIDC IDSC
- 3 March 2020 SIDC IDSC
- 29 January 2020 SIDC IDSC
- 12 December 2019 SIDC IDSC
- 12 September 2019 SIDC IDSC
Market Involvement
A User Group was convened with Market Parties (MPs) as an interface between the XBID Project and the Market. Following the successful XBID Go-Live it is agreed that the Market European Stakeholder Group (MESC) is the primary interface with MPs.
- IDA pre launch event
- 4th Wave Go-Live Single Intraday Coupling (SIDC) Pre-launch Event
- 3rd Wave Pre-Launch Event Presentations
- 2nd Wave Pre-Launch Event Presentations
- 1st Go-Live Pre-Launch Event Presentations
Previous Market Involvement documents
Press Releases
- IDA Go-Live - Successful Project Cooperation
- IDA Go-Live Press Release
- Confirmation of the go-live date for Intraday Auctions (IDAs) on 13 June 2024
- SIDC announces the successful go-live for BRM in Romania
- The SIDC held a pre-launch event about the new Intraday Auctions
- SIDC invitation to the IDA go-live on Single Intraday Coupling (SIDC) Pre-launch Event
- SIDC announces the successful launch of 15-minute MTU capacity allocation on HR-SI and HR-HU borders
- Successful test of 15-minute MTU allocation on HR-SI and HR-HU borders
- Successful go-live for ETPA as the third NEMO to operate in the Dutch Market Area within SIDC
- Confirmation of Go-Live date for ETPA
- Unsuccessful go-live for ETPA
- Confirmation of Go-Live date for ETPA as the third NEMO to operate in the Dutch Market Area within SIDC
Previous Press Releases
- Successful fourth wave go-live
- Expansion of 15-minute products to Bulgaria
- Successful Local Implementation Project 14 Go-Live
- Local Implementation Project 14 Go-Live confirmation
- Revised Local Implementation Project 14 Go-Live
- Expansion of 30 and 15 minute products and Revised Local Implementation Project 14 Go-Live
- NEMOs and TSOs are safeguarding the Day-Ahead and Intraday market coupling
- Date confirmation of the 2nd wave go-live
- XBID – 1st anniversary and announcement of 2nd Wave Go-Live
- 2nd go live impact
- 2nd Wave and Gate Opening Time
- uccessful Go-Live and End of Rollback
Information notes
SIDC Report on Critical Incident Experienced on 21st of May 2024
SIDC report on Critical Incident Experienced on 25th of July 2022
Intraday Operational Agreement
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:
- Operational contracts
- Operational procedures
- Change control procedures
- Monitoring procedures
- Fallback procedures
- 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:
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).
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.
Please note that 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).
Intraday Operational Agreement (IDOA)
Exhibit 6: Operational Procedures
XBID_JOINT_NOR_02 Distribution of allocation information (redacted)
XBID_JOINT_BUP_02 Distribution of allocation information (redacted)
XBID_JOINT_EXC_01 Closing and re-opening of an Interconnector(s)
XBID_JOINT_OTF_06 Planned Maintenance Window Local Shipper System
SIDC_JOINT_OTF_07 Algorithm Monitoring Procedure included under Exhibit 18
TSO Cooperation Agreement for Single Intraday coupling (TCID)
APPENDIX D - TSO-only operational procedures - see below