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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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RESOLVED : Temporary Unavailability of Auction Data

by JAO

The Auction Data webpage (http://jao.eu/auctions#/)  is back to working normally
Apologies for the inconvenience.

Capacity Curtailment on the IT-CH border for delivery period 28-09-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

IT-CH

3. Triggering event:

Curtailment due to Curtailment to ensure operation remains within Operational Security Limits

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

28-09-2026 17:00 - 18:00 719 MW

28-09-2026 18:00 - 19:00 719 MW

28-09-2026 19:00 - 20:00 719 MW

28-09-2026 20:00 - 21:00 719 MW

28-09-2026 21:00 - 22:00 719 MW

28-09-2026 22:00 - 23:00 719 MW

5. Amount of LTTR remaining after curtailment:

28-09-2026 17:00 - 18:00 594 MW

28-09-2026 18:00 - 19:00 0 MW

28-09-2026 19:00 - 20:00 0 MW

28-09-2026 20:00 - 21:00 0 MW

28-09-2026 21:00 - 22:00 0 MW

28-09-2026 22:00 - 23:00 594 MW

Capacity Curtailment on the IT-AT border for delivery period 28-09-2026

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:

28-09-2026 18:00 - 19:00 64 MW

28-09-2026 19:00 - 20:00 64 MW

28-09-2026 20:00 - 21:00 64 MW

28-09-2026 21:00 - 22:00 64 MW

5. Amount of LTTR remaining after curtailment:

28-09-2026 18:00 - 19:00 2 MW

28-09-2026 19:00 - 20:00 2 MW

28-09-2026 20:00 - 21:00 2 MW

28-09-2026 21:00 - 22:00 2 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
 

Capacity Curtailment on the IT-GR border for delivery period 28-09-2026

by JAO

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:

28-09-2026 18:00 - 19:00 500 MW

28-09-2026 19:00 - 20:00 500 MW

28-09-2026 20:00 - 21:00 500 MW

28-09-2026 21:00 - 22:00 500 MW

5. Amount of LTTR remaining after curtailment:

28-09-2026 18:00 - 19:00 0 MW

28-09-2026 19:00 - 20:00 0 MW

28-09-2026 20:00 - 21:00 0 MW

28-09-2026 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:
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

Capacity Curtailment on the IT-FR border for delivery period 28-09-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

IT-FR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

28-09-2026 17:00 - 18:00 1370 MW

28-09-2026 18:00 - 19:00 1370 MW

28-09-2026 19:00 - 20:00 1370 MW

28-09-2026 20:00 - 21:00 1370 MW

28-09-2026 21:00 - 22:00 1370 MW

28-09-2026 22:00 - 23:00 1370 MW

5. Amount of LTTR remaining after curtailment:

28-09-2026 17:00 - 18:00 681 MW

28-09-2026 18:00 - 19:00 0 MW

28-09-2026 19:00 - 20:00 0 MW

28-09-2026 20:00 - 21:00 0 MW

28-09-2026 21:00 - 22:00 0 MW

28-09-2026 22:00 - 23:00 681 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

Capacity Curtailment on the IT-SI border for delivery period 28-09-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

IT-SI

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

28-09-2026 17:00 - 18:00 320 MW

28-09-2026 18:00 - 19:00 320 MW

28-09-2026 19:00 - 20:00 320 MW

28-09-2026 20:00 - 21:00 320 MW

28-09-2026 21:00 - 22:00 320 MW

28-09-2026 22:00 - 23:00 320 MW

5. Amount of LTTR remaining after curtailment:

28-09-2026 17:00 - 18:00 215 MW

28-09-2026 18:00 - 19:00 0 MW

28-09-2026 19:00 - 20:00 0 MW

28-09-2026 20:00 - 21:00 0 MW

28-09-2026 21:00 - 22:00 0 MW

28-09-2026 22:00 - 23:00 215 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

UPDATE : Temporary Unavailability of Auction Data

by JAO

The Auction Data webpage (http://jao.eu/auctions#/)  is currently experiencing an issue displaying data.

The underlying services remain available, and market participants may continue to access data through the Open API Web Services while the issue is being investigated.

We will keep you informed of any further updates.

Apologies for the inconvenience.

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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Do you need support?

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

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