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Annual Report

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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 IT-CH border for delivery period 23-09-2026

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:

23-09-2026 17:00 - 18:00 719 MW

23-09-2026 18:00 - 19:00 719 MW

23-09-2026 19:00 - 20:00 719 MW

23-09-2026 20:00 - 21:00 719 MW

23-09-2026 21:00 - 22:00 719 MW

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

5. Amount of LTTR remaining after curtailment:

23-09-2026 17:00 - 18:00 594 MW

23-09-2026 18:00 - 19:00 0 MW

23-09-2026 19:00 - 20:00 0 MW

23-09-2026 20:00 - 21:00 0 MW

23-09-2026 21:00 - 22:00 0 MW

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

Capacity Curtailment on the SI-IT border for delivery period 23-09-2026

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:

23-09-2026 03:00 - 04:00 227 MW

23-09-2026 04:00 - 05:00 227 MW

23-09-2026 05:00 - 06:00 227 MW

23-09-2026 06:00 - 07:00 227 MW

5. Amount of LTTR remaining after curtailment:

23-09-2026 03:00 - 04:00 188 MW

23-09-2026 04:00 - 05:00 188 MW

23-09-2026 05:00 - 06:00 188 MW

23-09-2026 06:00 - 07:00 188 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-FR border for delivery period 23-09-2026

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:

23-09-2026 18:00 - 19:00 366 MW

23-09-2026 19:00 - 20:00 366 MW

23-09-2026 20:00 - 21:00 366 MW

23-09-2026 21:00 - 22:00 366 MW

5. Amount of LTTR remaining after curtailment:

23-09-2026 18:00 - 19:00 0 MW

23-09-2026 19:00 - 20:00 0 MW

23-09-2026 20:00 - 21:00 0 MW

23-09-2026 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

Capacity Curtailment on the IT-SI border for delivery period 23-09-2026

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:

23-09-2026 18:00 - 19:00 320 MW

23-09-2026 19:00 - 20:00 320 MW

23-09-2026 20:00 - 21:00 320 MW

23-09-2026 21:00 - 22:00 320 MW

5. Amount of LTTR remaining after curtailment:

23-09-2026 18:00 - 19:00 0 MW

23-09-2026 19:00 - 20:00 0 MW

23-09-2026 20:00 - 21:00 0 MW

23-09-2026 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

Capacity Curtailment on the GR-IT border for delivery period 23-09-2026

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:

23-09-2026 12:00 - 13:00 500 MW

23-09-2026 13:00 - 14:00 500 MW

23-09-2026 14:00 - 15:00 500 MW

5. Amount of LTTR remaining after curtailment:

23-09-2026 12:00 - 13:00 0 MW

23-09-2026 13:00 - 14:00 0 MW

23-09-2026 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 IT-AT border for delivery period 23-09-2026

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:

23-09-2026 18:00 - 19:00 64 MW

23-09-2026 19:00 - 20:00 64 MW

23-09-2026 20:00 - 21:00 64 MW

23-09-2026 21:00 - 22:00 64 MW

5. Amount of LTTR remaining after curtailment:

23-09-2026 18:00 - 19:00 2 MW

23-09-2026 19:00 - 20:00 2 MW

23-09-2026 20:00 - 21:00 2 MW

23-09-2026 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

Capacity Curtailment on the ES-FR border for delivery period 23-09-2026

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:

23-09-2026 20:00 - 21:00 1119 MW

23-09-2026 21:00 - 22:00 1119 MW

5. Amount of LTTR remaining after curtailment:

23-09-2026 20:00 - 21:00 884 MW

23-09-2026 21:00 - 22:00 840 MW

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

   23/09/2026

      20:00-21:00 Network Security

      21:00-22:00 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

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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JAO workers

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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