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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

Capacity Curtailment on the IF2-FR-GB && IF2-GB-FR border for delivery period 21/03/2026

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:

IF2-FR-GB && IF2-GB-FR

3, Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

4. Affected volume in MW / period:

21-03-2026 10:00 - 11:00 649 MW

21-03-2026 11:00 - 12:00 649 MW

21-03-2026 12:00 - 13:00 649 MW

21-03-2026 13:00 - 14:00 649 MW

5. Amount of LTTR remaining after curtailment:

21-03-2026 10:00 - 11:00 0 MW

21-03-2026 11:00 - 12:00 0 MW

21-03-2026 12:00 - 13:00 0 MW

21-03-2026 13:00 - 14:00 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)*?

*According to section 57.3 of the EU HAR, this field can be filled in within 24 hours after the initial publication.
      Capacity limitation due to planned maintenance

Unavailability of Data in Publication Tool Nordic CCR For Business Date 05/02/2026

by JAO

We would like to inform all Market Participants that the data being published in Publication Tool Nordic CCR for the Preliminary Domain for delivery 05/02/2026, will not be available as it's not generated by the provider.

Thank you for your understanding.

Delay of publications in Publication Tool For Business Date 04/02/2026

by JAO

We would like to inform all Market Participants about possible delays of data being published in Publication Tool for delivery 04/02/2026.

Please also expect some delays for the upcoming days too.

Thank you for your understanding.

2026 Auction Calendar update

by JAO

We would like to inform you that as per TSOs request, the 2026 Auction Calendar has been updated on the corridor IF2- GB<>FR

For more details, please refer to the Auction Calendar on our webpage http://www.jao.eu/auctions#/calendar/table to find its latest version.

Invitation to the Border Test Session: UA<>SK,  UA <>HU (Intraday Products)

by JAO

We invite you to join our upcoming test session for the new intraday products for the 2 borders :

  • Ukraine-Slovakia: UA <> SK
  • Ukraine-Hungary: UA <> HU
     

The test is preliminary scheduled for 19th of February 2026. A final date confirmation will follow.

This event presents an excellent opportunity for you to engage in dummy auctions, thoroughly test your bid files and seamlessly integrate eCAT’s output files into your applications.

 

To register for the test session, kindly send us the following information to helpdesk@jao.eu :

  • Company name
  • EIC code
  • Username (if you are already registered in eCAT) or your full name
  • Email address

 

The registration for this test will conclude on the 15th of February 2026.

Further details concerning the exact date, timing, and the specific scenarios to be tested will be communicated in a subsequent notice.
 

Should you have any questions or wish to share feedback, please do not hesitate to reach out to us.

Your insights and participation are highly valued as we work together to enhance this process.

 

Thank you,

JAO Customer Service and Support

Capacity Curtailment on the ES-FR border for delivery period 04-02-2026

by JAO

1. TSO(s)*:

RTE, REE

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:

04-02-2026 08:00 - 09:00 1180 MW

04-02-2026 09:00 - 10:00 1180 MW

04-02-2026 10:00 - 11:00 1180 MW

04-02-2026 11:00 - 12:00 1180 MW

04-02-2026 12:00 - 13:00 1180 MW

04-02-2026 13:00 - 14:00 1180 MW

5. Amount of LTTR remaining after curtailment:

04-02-2026 08:00 - 09:00 1072 MW

04-02-2026 09:00 - 10:00 1072 MW

04-02-2026 10:00 - 11:00 1072 MW

04-02-2026 11:00 - 12:00 1072 MW

04-02-2026 12:00 - 13:00 1072 MW

04-02-2026 13:00 - 14:00 1072 MW

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

      08:00-09:00 argia-mouguerre 2

      09:00-10:00 argia-mouguerre 2

      10:00-11:00 argia-mouguerre 2

      11:00-12:00 argia-mouguerre 2

      12:00-13:00 argia-mouguerre 2

      13:00-14:00 argia-mouguerre 2

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

Delay of publications in Publication Tool For Business Date 03/02/2026

by JAO

We would like to inform all Market Participants about possible delays of data being published in Publication Tool for delivery 03/02/2026.

Thank you for your understanding.

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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