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

Latest market messages

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Capacity Curtailment on the ES-FR border for delivery period 24-03-2026

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:

24-03-2026 07:00 - 08:00 1830 MW

24-03-2026 08:00 - 09:00 1830 MW

24-03-2026 09:00 - 10:00 1830 MW

24-03-2026 10:00 - 11:00 1830 MW

24-03-2026 11:00 - 12:00 1830 MW

24-03-2026 12:00 - 13:00 1830 MW

24-03-2026 13:00 - 14:00 1830 MW

24-03-2026 14:00 - 15:00 1830 MW

24-03-2026 15:00 - 16:00 1830 MW

24-03-2026 16:00 - 17:00 1830 MW

5. Amount of LTTR remaining after curtailment:

24-03-2026 07:00 - 08:00 971 MW

24-03-2026 08:00 - 09:00 971 MW

24-03-2026 09:00 - 10:00 971 MW

24-03-2026 10:00 - 11:00 971 MW

24-03-2026 11:00 - 12:00 971 MW

24-03-2026 12:00 - 13:00 971 MW

24-03-2026 13:00 - 14:00 971 MW

24-03-2026 14:00 - 15:00 971 MW

24-03-2026 15:00 - 16:00 971 MW

24-03-2026 16:00 - 17:00 971 MW

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

       07:00-08:00 Dambron - Verger

      08:00-09:00 Dambron - Verger

      09:00-10:00 Dambron - Verger

      10:00-11:00 Dambron - Verger

      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

*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 SI-IT border for delivery period 23-03-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

SI-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

23-03-2026 18:00 - 19:00 274 MW

23-03-2026 19:00 - 20:00 274 MW

23-03-2026 20:00 - 21:00 274 MW

5. Amount of LTTR remaining after curtailment:

23-03-2026 18:00 - 19:00 244 MW

23-03-2026 19:00 - 20:00 244 MW

23-03-2026 20:00 - 21:00 244 MW

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

Expected violation of operational security limits of physical transmission assets

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

During the CC process, all the remedial actions provided by the TSOs are already considered by the CCC

Capacity Curtailment on the IT-AT border for delivery period 23-03-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

IT-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

23-03-2026 18:00 - 19:00 89 MW

23-03-2026 19:00 - 20:00 89 MW

23-03-2026 20:00 - 21:00 89 MW

5. Amount of LTTR remaining after curtailment:

23-03-2026 18:00 - 19:00 67 MW

23-03-2026 19:00 - 20:00 67 MW

23-03-2026 20:00 - 21:00 67 MW

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

Expected violation of operational security limits of physical transmission assets

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

During the CC process, all the remedial actions provided by the TSOs are already considered by the CCC

Capacity Curtailment on the GR-IT border for delivery period 22-03-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

GR-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

22-03-2026 08:00 - 09:00 500 MW

22-03-2026 09:00 - 10:00 500 MW

22-03-2026 10:00 - 11:00 500 MW

22-03-2026 11:00 - 12:00 500 MW

22-03-2026 12:00 - 13:00 500 MW

22-03-2026 13:00 - 14:00 500 MW

22-03-2026 14:00 - 15:00 500 MW

5. Amount of LTTR remaining after curtailment:

22-03-2026 08:00 - 09:00 0 MW

22-03-2026 09:00 - 10:00 0 MW

22-03-2026 10:00 - 11:00 0 MW

22-03-2026 11:00 - 12:00 0 MW

22-03-2026 12:00 - 13:00 0 MW

22-03-2026 13:00 - 14:00 0 MW

22-03-2026 14:00 - 15:00 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

Capacity Curtailment on the ME-IT border for delivery period 22-03-2026

by JAO

1. TSO(s)*:

CGES

2. Identification of affected Long Term Transmission Rights:

ME-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

22-03-2026 08:00 - 09:00 400 MW

22-03-2026 09:00 - 10:00 400 MW

22-03-2026 10:00 - 11:00 400 MW

22-03-2026 11:00 - 12:00 400 MW

22-03-2026 12:00 - 13:00 400 MW

22-03-2026 13:00 - 14:00 400 MW

22-03-2026 14:00 - 15:00 400 MW

5. Amount of LTTR remaining after curtailment:

22-03-2026 08:00 - 09:00 0 MW

22-03-2026 09:00 - 10:00 0 MW

22-03-2026 10:00 - 11:00 0 MW

22-03-2026 11:00 - 12:00 0 MW

22-03-2026 12:00 - 13:00 0 MW

22-03-2026 13:00 - 14:00 0 MW

22-03-2026 14:00 - 15:00 0 MW

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

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

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 corridors 

VKL-D1-GB

VKL-GB-D1

IF1-FR-GB

IF1-GB-FR

IF2-FR-GB

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.

Capacity Curtailment on the GR-IT border for delivery period 21-03-2026

by JAO

1. TSO(s)*:

TERNA, ADMIE

2. Identification of affected Long Term Transmission Rights:

GR-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

21-03-2026 09:00 - 10:00 500 MW

21-03-2026 10:00 - 11:00 500 MW

21-03-2026 11:00 - 12:00 500 MW

21-03-2026 12:00 - 13:00 500 MW

21-03-2026 13:00 - 14:00 500 MW

21-03-2026 14:00 - 15:00 500 MW

21-03-2026 15:00 - 16:00 500 MW

5. Amount of LTTR remaining after curtailment:

21-03-2026 09:00 - 10:00 0 MW

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

21-03-2026 14:00 - 15:00 0 MW

21-03-2026 15:00 - 16:00 0 MW

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

 

7. Why alternative measures are not sufficient to avoid the expected violation of operational security limit(s)*?
During the CC process, all the remedial actions provided by the TSOs are already considered by the CCC in the calculation

Resource Center

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

Go to resources

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.

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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Frequently asked questions

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

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If you can't find an answer to your question, our team is here to help!

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