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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.

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

500+

Registered market participants
26k+

Auctions held annually
100%

Auction tool availability
80+

Employees
50

TSOs serviced

Latest market messages

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2026 Auction Calendar update

Published: 10/09/2026 | 22:10 by JAO
Capacity Curtailment on the IF1-GB-FR border for delivery period 24-09-2026

Published: 10/09/2026 | 19:52 by JAO
2026 Auction Calendar update

Published: 10/09/2026 | 12:03 by JAO
Reminder - Invitation to Participate in Open Test Session – September 16th 2026

Published: 10/09/2026 | 12:01 by JAO
Delay in PUTO Platform Publication

Published: 10/09/2026 | 11:20 by JAO
Capacity Curtailment on the IT-GR border for delivery period 11-09-2026

Published: 10/09/2026 | 07:39 by JAO
Cancellation of capacity curtailment on IT-GR border for delivery date 11-09-2026

Published: 10/09/2026 | 07:37 by JAO

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We would like to inform you that as per TSOs request, the 2026 Auction Calendar has been updated on the corridor EL1 and NSL.

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

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:

24-09-2026 00:00 - 01:00 900 MW

24-09-2026 01:00 - 02:00 900 MW

24-09-2026 02:00 - 03:00 900 MW

24-09-2026 03:00 - 04:00 900 MW

24-09-2026 04:00 - 05:00 900 MW

24-09-2026 05:00 - 06:00 900 MW

24-09-2026 06:00 - 07:00 900 MW

24-09-2026 07:00 - 08:00 900 MW

24-09-2026 08:00 - 09:00 900 MW

24-09-2026 09:00 - 10:00 900 MW

24-09-2026 10:00 - 11:00 900 MW

24-09-2026 11:00 - 12:00 900 MW

24-09-2026 12:00 - 13:00 900 MW

24-09-2026 13:00 - 14:00 900 MW

24-09-2026 14:00 - 15:00 900 MW

24-09-2026 15:00 - 16:00 900 MW

24-09-2026 16:00 - 17:00 900 MW

24-09-2026 17:00 - 18:00 900 MW

24-09-2026 18:00 - 19:00 900 MW

24-09-2026 19:00 - 20:00 900 MW

24-09-2026 20:00 - 21:00 900 MW

24-09-2026 21:00 - 22:00 900 MW

24-09-2026 22:00 - 23:00 900 MW

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

5. Amount of LTTR remaining after curtailment:

24-09-2026 00:00 - 01:00 0 MW

24-09-2026 01:00 - 02:00 0 MW

24-09-2026 02:00 - 03:00 0 MW

24-09-2026 03:00 - 04:00 0 MW

24-09-2026 04:00 - 05:00 0 MW

24-09-2026 05:00 - 06:00 0 MW

24-09-2026 06:00 - 07:00 0 MW

24-09-2026 07:00 - 08:00 0 MW

24-09-2026 08:00 - 09:00 0 MW

24-09-2026 09:00 - 10:00 0 MW

24-09-2026 10:00 - 11:00 0 MW

24-09-2026 11:00 - 12:00 0 MW

24-09-2026 12:00 - 13:00 0 MW

24-09-2026 13:00 - 14:00 0 MW

24-09-2026 14:00 - 15:00 0 MW

24-09-2026 15:00 - 16:00 0 MW

24-09-2026 16:00 - 17:00 0 MW

24-09-2026 17:00 - 18:00 0 MW

24-09-2026 18:00 - 19:00 0 MW

24-09-2026 19:00 - 20:00 0 MW

24-09-2026 20:00 - 21:00 0 MW

24-09-2026 21:00 - 22:00 0 MW

24-09-2026 22:00 - 23:00 0 MW

24-09-2026 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

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

We would like to inform you that as per TSOs request, the 2026 Auction Calendar has been updated on the corridor NLL-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.

We are pleased to invite you to register for our upcoming open test session, scheduled to take place from on September 16^th 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, send an email to helpdesk@jao.eu or 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 the end of this week.

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

Please be informed that information for the Core ID CCR PuTO & Italy North CCR & IBWT IDA and will be published later than planned on the PUTO platform.

We will make the information available as soon as possible.

1. TSO(s)*:

TERNA, ADMIE

2. Identification of affected Long Term Transmission Rights:

IT-GR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

11-09-2026 19:00 - 20:00 500 MW

11-09-2026 20:00 - 21:00 500 MW

11-09-2026 21:00 - 22:00 500 MW

5. Amount of LTTR remaining after curtailment:

11-09-2026 19:00 - 20:00 0 MW

11-09-2026 20:00 - 21:00 0 MW

11-09-2026 21:00 - 22:00 0 MW

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

HVDC cable ARACTHOS – GALATINA

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

Not Applicable

This curtailment has been cancelled. Please see below the details:

1. TSO(s)*:
TERNA

2. Identification of affected Long Term Transmission Rights:
IT-GR

3. Triggering event:
Curtailment to ensure operation remains within Operational Security Limits

4. Affected volume in MW / hour for each concerned period:
11-09-2026 19:00 - 20:00 500 MW
11-09-2026 20:00 - 21:00 500 MW
11-09-2026 21:00 - 22:00 500 MW

Resource Center

This section contains key information for market participants such as user guides, forms, auction rules, nomination deadlines and other documents.

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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.

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.

Get to know us

Register your company

We created a user guide to support the onboarding of market participants. Learn more about the steps to register, the required documents and our service desk platform.

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