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Leading service provider for Transmission System Operators (TSOs) in the European electricity market.

Through our single trading platform we auction cross-border transmission capacity rights. We also provide accounting (clearing and settlement), contracting, reporting, project support and IT services.

 

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Auctions

On behalf of TSOs, we organize long and short-term auctions of transmission capacity rights.

We offer the following products: yearly, seasonal, quarterly, monthly, weekly, daily and intraday.

Auction results Auction calendar
OPS
  • 500+
    Registered market participants
  • 26k+
    Auctions held annually
  • 100%
    Auction tool availability
  • 80+
    Employees
  • 50
    TSOs serviced

Latest market messages

SDAC_JAO_01: SDAC market coupling 27/08 - Session complete

by JAO

Please be informed that the day-ahead market coupling session is now completed.

Delay in Market Coupling Results publication

by JAO

Please be aware that the publication of the SDAC Market Coupling Results is delayed until further notice.

The Market Coupling Results will be published as soon as they are available.

If needed, another delay message will be sent out.
Further information can be found in the Fallback Manual that is published on the websites of NEMO Committee and ENTSO-E.

Invitation to Participate in Open Test Session – September 16th 2026

by JAO

We are pleased to invite you to register for our upcoming open test session, scheduled to take place from on September 16th 2026.

This event offers an excellent opportunity to:

  • Test a Full Decoupling scenario
  • Thoroughly test your bid files
  • Seamlessly integrate eCAT’s output files into your internal systems
  • Please note that this session will not include LTFBA testing

To register, please reply to this email with the following information:

Company Name

EIC code

eCAT username(s) (if available)

Email Address

Full Name

Please note that registration will close on September 9th 2026.

Further details regarding timing, access, and specific testing scenarios will be provided in a follow-up communication.

If you have any questions or would like to share feedback, please don’t hesitate to reach out. Your participation and insights are highly appreciated.

Best regards,

JAO Operations Team

Capacity Curtailment on the ES-FR border for delivery period 28-08-2026

by JAO

1. TSO(s)*:

RTE-TSO

2. Identification of affected Long Term Transmission Rights:

ES-FR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

4. Affected volume in MW / hour for each concerned period:

28-08-2026 11:00 - 12:00 674 MW

28-08-2026 12:00 - 13:00 674 MW

28-08-2026 13:00 - 14:00 674 MW

28-08-2026 14:00 - 15:00 674 MW

28-08-2026 15:00 - 16:00 674 MW

28-08-2026 16:00 - 17:00 674 MW

5. Amount of LTTR remaining after curtailment:

28-08-2026 11:00 - 12:00 276 MW

28-08-2026 12:00 - 13:00 276 MW

28-08-2026 13:00 - 14:00 276 MW

28-08-2026 14:00 - 15:00 276 MW

28-08-2026 15:00 - 16:00 276 MW

28-08-2026 16:00 - 17:00 276 MW

6. Information on exact operational limit(s) that are expected to be violated in the absence of curtailment :

   28/08/2026

      11:00-12:00 Dambron - Verger

      12:00-13:00 Dambron - Verger

      13:00-14:00 Dambron - Verger

      14:00-15:00 Dambron - Verger

      15:00-16:00 Dambron - Verger

      16:00-17:00 Dambron - Verger

7. Why alternative measures are not sufficient to avoid the expected violation of operational security limit(s) ? :

   The available remedial actions were assessed as insufficient or ineffective to avoid the violation of operational security limits

Publication Tool data for Core ID CCR IDA2 Delivery Day 27/08/2026

by JAO

Please be informed that, due to the cancellation of IDA2 for the delivery date 27/08/2026, no IDA2 publication data will be available in the CORE ID CCR Publication Tool 

Capacity Curtailment on the FR-CH border for delivery period 28-08-2026

by JAO

1. TSO(s)*:

RTE-TSO

2. Identification of affected Long Term Transmission Rights:

FR-CH

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

4. Affected volume in MW / hour for each concerned period:

28-08-2026 00:00 - 01:00 370 MW

28-08-2026 01:00 - 02:00 370 MW

28-08-2026 02:00 - 03:00 370 MW

28-08-2026 03:00 - 04:00 370 MW

28-08-2026 04:00 - 05:00 370 MW

28-08-2026 05:00 - 06:00 370 MW

28-08-2026 06:00 - 07:00 370 MW

28-08-2026 07:00 - 08:00 370 MW

28-08-2026 08:00 - 09:00 370 MW

28-08-2026 09:00 - 10:00 370 MW

28-08-2026 10:00 - 11:00 370 MW

28-08-2026 11:00 - 12:00 370 MW

28-08-2026 12:00 - 13:00 370 MW

28-08-2026 13:00 - 14:00 370 MW

28-08-2026 14:00 - 15:00 370 MW

28-08-2026 15:00 - 16:00 370 MW

28-08-2026 16:00 - 17:00 370 MW

28-08-2026 17:00 - 18:00 370 MW

28-08-2026 18:00 - 19:00 370 MW

28-08-2026 19:00 - 20:00 370 MW

28-08-2026 20:00 - 21:00 370 MW

28-08-2026 21:00 - 22:00 370 MW

28-08-2026 22:00 - 23:00 370 MW

28-08-2026 23:00 - 24:00 370 MW

5. Amount of LTTR remaining after curtailment:

28-08-2026 00:00 - 01:00 0 MW

28-08-2026 01:00 - 02:00 0 MW

28-08-2026 02:00 - 03:00 0 MW

28-08-2026 03:00 - 04:00 0 MW

28-08-2026 04:00 - 05:00 0 MW

28-08-2026 05:00 - 06:00 0 MW

28-08-2026 06:00 - 07:00 0 MW

28-08-2026 07:00 - 08:00 0 MW

28-08-2026 08:00 - 09:00 0 MW

28-08-2026 09:00 - 10:00 0 MW

28-08-2026 10:00 - 11:00 0 MW

28-08-2026 11:00 - 12:00 0 MW

28-08-2026 12:00 - 13:00 0 MW

28-08-2026 13:00 - 14:00 0 MW

28-08-2026 14:00 - 15:00 0 MW

28-08-2026 15:00 - 16:00 0 MW

28-08-2026 16:00 - 17:00 0 MW

28-08-2026 17:00 - 18:00 0 MW

28-08-2026 18:00 - 19:00 0 MW

28-08-2026 19:00 - 20:00 0 MW

28-08-2026 20:00 - 21:00 0 MW

28-08-2026 21:00 - 22:00 0 MW

28-08-2026 22:00 - 23:00 0 MW

28-08-2026 23:00 - 24:00 0 MW

6. Information on exact operational security limit(s) that are expected to be violated in the absence of curtailment*:

28/08/2026

      00:00-01:00 Network Security

      01:00-02:00 Network Security

      02:00-03:00 Network Security

      03:00-04:00 Network Security

      04:00-05:00 Network Security

      05:00-06:00 Network Security

      06:00-07:00 Network Security

      07:00-08:00 Network Security

      08:00-09:00 Network Security

      09:00-10:00 Network Security

      10:00-11:00 Network Security

      11:00-12:00 Network Security

      12:00-13:00 Network Security

      13:00-14:00 Network Security

      14:00-15:00 Network Security

      15:00-16:00 Network Security

      16:00-17:00 Network Security

      17:00-18:00 Network Security

      18:00-19:00 Network Security

      19:00-20:00 Network Security

      20:00-21:00 Network Security

      21:00-22:00 Network Security

      22:00-23:00 Network Security

      23:00-24:00 Network Security

7. Why alternative measures are not sufficient to avoid the expected violation of operational security limit(s)*?

The available remedial actions were assessed as insufficient or ineffective to avoid the violation of operational security limits

*According to section 57.3 of the EU HAR, this field can be filled in within 24 hours after the initial publication

Capacity Curtailment on the IF1-GB-FR border for delivery period 09-09-2026

by JAO

1. TSO(s)*:

National Grid Interconnectors Limited (NGIC) and RTE EDF Transport S.A. (RTE)

2. Identification of affected Long Term Transmission Rights:

IF1-GB-FR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

4. Affected volume in MW / hour for each concerned period:

09-09-2026 08:00 - 09:00 900 MW

09-09-2026 09:00 - 10:00 900 MW

09-09-2026 10:00 - 11:00 900 MW

09-09-2026 11:00 - 12:00 900 MW

09-09-2026 12:00 - 13:00 900 MW

09-09-2026 13:00 - 14:00 900 MW

09-09-2026 14:00 - 15:00 900 MW

09-09-2026 15:00 - 16:00 900 MW

09-09-2026 16:00 - 17:00 900 MW

09-09-2026 17:00 - 18:00 900 MW

09-09-2026 18:00 - 19:00 900 MW

09-09-2026 19:00 - 20:00 900 MW

09-09-2026 20:00 - 21:00 900 MW

09-09-2026 21:00 - 22:00 900 MW

09-09-2026 22:00 - 23:00 900 MW

09-09-2026 23:00 - 24:00 900 MW

5. Amount of LTTR remaining after curtailment:

09-09-2026 08:00 - 09:00 0 MW

09-09-2026 09:00 - 10:00 0 MW

09-09-2026 10:00 - 11:00 0 MW

09-09-2026 11:00 - 12:00 0 MW

09-09-2026 12:00 - 13:00 0 MW

09-09-2026 13:00 - 14:00 0 MW

09-09-2026 14:00 - 15:00 0 MW

09-09-2026 15:00 - 16:00 0 MW

09-09-2026 16:00 - 17:00 0 MW

09-09-2026 17:00 - 18:00 0 MW

09-09-2026 18:00 - 19:00 0 MW

09-09-2026 19:00 - 20:00 0 MW

09-09-2026 20:00 - 21:00 0 MW

09-09-2026 21:00 - 22:00 0 MW

09-09-2026 22:00 - 23:00 0 MW

09-09-2026 23:00 - 24:00 0 MW

6. Information on exact operational security limit(s) that are expected to be violated in the absence of curtailment*:

      Thermal Limits

7. Why alternative measures are not sufficient to avoid the expected violation of operational security limit(s)*?

      Capacity limitation due to unplanned maintenance

Our certifications

JAO has successfully implemented internationally recognized management systems and is now officially certified for ISO/IEC 27001:2022 – the global standard for Information Security Management Systems and for ISO 9001 – the international standard for Quality Management Systems. 

ISO
IT

About us

We started as a shared auction platform for transmission capacity across Central Western Europe in 2008. Over time, we became the operator of the Single Allocation Platform and therefore the leading trading platform for European Transmission System Operators.

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Frequently asked questions

Check out the common questions and our answers on how to use the auction platform.

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