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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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Capacity Curtailment on the BG-GR border for delivery period 19-04-2026

Published: 18/04/2026 | 08:01 by JAO
Capacity Curtailment on the CH-IT border for delivery period 19-04-2026

Published: 18/04/2026 | 07:28 by JAO
Capacity Curtailment on the SI-IT border for delivery period 19-04-2026

Published: 18/04/2026 | 07:21 by JAO
Capacity Curtailment on the IT-GR border for delivery period 19-04-2026

Published: 18/04/2026 | 07:20 by JAO
Capacity Curtailment on the GR-IT border for delivery period 19-04-2026

Published: 18/04/2026 | 07:19 by JAO
Capacity Curtailment on the FR-IT border for delivery period 19-04-2026

Published: 18/04/2026 | 07:17 by JAO
Capacity Curtailment on the AT-IT border for delivery period 19-04-2026

Published: 18/04/2026 | 07:17 by JAO

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1. TSO(s)*:

IPTO (ADMIE) & ESO

2. Identification of affected Long Term Transmission Rights:

BG-GR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

19-04-2026 06:00 - 07:00 800 MW

19-04-2026 07:00 - 08:00 800 MW

19-04-2026 08:00 - 09:00 800 MW

19-04-2026 09:00 - 10:00 800 MW

19-04-2026 10:00 - 11:00 800 MW

19-04-2026 11:00 - 12:00 800 MW

19-04-2026 12:00 - 13:00 800 MW

19-04-2026 13:00 - 14:00 800 MW

19-04-2026 14:00 - 15:00 800 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 06:00 - 07:00 483 MW

19-04-2026 07:00 - 08:00 483 MW

19-04-2026 08:00 - 09:00 483 MW

19-04-2026 09:00 - 10:00 483 MW

19-04-2026 10:00 - 11:00 483 MW

19-04-2026 11:00 - 12:00 483 MW

19-04-2026 12:00 - 13:00 483 MW

19-04-2026 13:00 - 14:00 483 MW

19-04-2026 14:00 - 15:00 483 MW

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

Operational security reasons.

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.

1. TSO(s)*:

SWISSGRID

2. Identification of affected Long Term Transmission Rights:

CH-IT

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:

19-04-2026 10:00 - 11:00 282 MW

19-04-2026 11:00 - 12:00 282 MW

19-04-2026 12:00 - 13:00 282 MW

19-04-2026 13:00 - 14:00 282 MW

19-04-2026 14:00 - 15:00 282 MW

19-04-2026 15:00 - 16:00 282 MW

19-04-2026 16:00 - 17:00 282 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 10:00 - 11:00 0 MW

19-04-2026 11:00 - 12:00 0 MW

19-04-2026 12:00 - 13:00 0 MW

19-04-2026 13:00 - 14:00 0 MW

19-04-2026 14:00 - 15:00 0 MW

19-04-2026 15:00 - 16:00 0 MW

19-04-2026 16:00 - 17:00 0 MW

1. TSO(s)*:

TERNA & ELES

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:

19-04-2026 10:00 - 11:00 59 MW

19-04-2026 11:00 - 12:00 59 MW

19-04-2026 12:00 - 13:00 59 MW

19-04-2026 13:00 - 14:00 59 MW

19-04-2026 14:00 - 15:00 59 MW

19-04-2026 15:00 - 16:00 59 MW

19-04-2026 16:00 - 17:00 59 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 10:00 - 11:00 3 MW

19-04-2026 11:00 - 12:00 3 MW

19-04-2026 12:00 - 13:00 3 MW

19-04-2026 13:00 - 14:00 3 MW

19-04-2026 14:00 - 15:00 3 MW

19-04-2026 15:00 - 16:00 3 MW

19-04-2026 16:00 - 17:00 3 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

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:

19-04-2026 00:00 - 01:00 500 MW

19-04-2026 01:00 - 02:00 500 MW

19-04-2026 02:00 - 03:00 500 MW

19-04-2026 03:00 - 04:00 500 MW

19-04-2026 04:00 - 05:00 500 MW

19-04-2026 05:00 - 06:00 500 MW

19-04-2026 06:00 - 07:00 500 MW

19-04-2026 07:00 - 08:00 500 MW

19-04-2026 08:00 - 09:00 500 MW

19-04-2026 09:00 - 10:00 500 MW

19-04-2026 10:00 - 11:00 500 MW

19-04-2026 11:00 - 12:00 500 MW

19-04-2026 12:00 - 13:00 500 MW

19-04-2026 13:00 - 14:00 500 MW

19-04-2026 14:00 - 15:00 500 MW

19-04-2026 15:00 - 16:00 500 MW

19-04-2026 16:00 - 17:00 500 MW

19-04-2026 17:00 - 18:00 500 MW

19-04-2026 18:00 - 19:00 500 MW

19-04-2026 19:00 - 20:00 500 MW

19-04-2026 20:00 - 21:00 500 MW

19-04-2026 21:00 - 22:00 500 MW

19-04-2026 22:00 - 23:00 500 MW

19-04-2026 23:00 - 24:00 500 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 00:00 - 01:00 243 MW

19-04-2026 01:00 - 02:00 243 MW

19-04-2026 02:00 - 03:00 243 MW

19-04-2026 03:00 - 04:00 243 MW

19-04-2026 04:00 - 05:00 243 MW

19-04-2026 05:00 - 06:00 243 MW

19-04-2026 06:00 - 07:00 243 MW

19-04-2026 07:00 - 08:00 243 MW

19-04-2026 08:00 - 09:00 243 MW

19-04-2026 09:00 - 10:00 243 MW

19-04-2026 10:00 - 11:00 243 MW

19-04-2026 11:00 - 12:00 243 MW

19-04-2026 12:00 - 13:00 243 MW

19-04-2026 13:00 - 14:00 243 MW

19-04-2026 14:00 - 15:00 243 MW

19-04-2026 15:00 - 16:00 243 MW

19-04-2026 16:00 - 17:00 243 MW

19-04-2026 17:00 - 18:00 243 MW

19-04-2026 18:00 - 19:00 243 MW

19-04-2026 19:00 - 20:00 243 MW

19-04-2026 20:00 - 21:00 243 MW

19-04-2026 21:00 - 22:00 243 MW

19-04-2026 22:00 - 23:00 243 MW

19-04-2026 23:00 - 24:00 243 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

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:

19-04-2026 00:00 - 01:00 500 MW

19-04-2026 01:00 - 02:00 500 MW

19-04-2026 02:00 - 03:00 500 MW

19-04-2026 03:00 - 04:00 500 MW

19-04-2026 04:00 - 05:00 500 MW

19-04-2026 05:00 - 06:00 500 MW

19-04-2026 06:00 - 07:00 500 MW

19-04-2026 07:00 - 08:00 500 MW

19-04-2026 08:00 - 09:00 500 MW

19-04-2026 09:00 - 10:00 500 MW

19-04-2026 10:00 - 11:00 500 MW

19-04-2026 11:00 - 12:00 500 MW

19-04-2026 12:00 - 13:00 500 MW

19-04-2026 13:00 - 14:00 500 MW

19-04-2026 14:00 - 15:00 500 MW

19-04-2026 15:00 - 16:00 500 MW

19-04-2026 16:00 - 17:00 500 MW

19-04-2026 17:00 - 18:00 500 MW

19-04-2026 18:00 - 19:00 500 MW

19-04-2026 19:00 - 20:00 500 MW

19-04-2026 20:00 - 21:00 500 MW

19-04-2026 21:00 - 22:00 500 MW

19-04-2026 22:00 - 23:00 500 MW

19-04-2026 23:00 - 24:00 500 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 00:00 - 01:00 241 MW

19-04-2026 01:00 - 02:00 241 MW

19-04-2026 02:00 - 03:00 241 MW

19-04-2026 03:00 - 04:00 241 MW

19-04-2026 04:00 - 05:00 241 MW

19-04-2026 05:00 - 06:00 241 MW

19-04-2026 06:00 - 07:00 241 MW

19-04-2026 07:00 - 08:00 0 MW

19-04-2026 08:00 - 09:00 0 MW

19-04-2026 09:00 - 10:00 0 MW

19-04-2026 10:00 - 11:00 0 MW

19-04-2026 11:00 - 12:00 0 MW

19-04-2026 12:00 - 13:00 0 MW

19-04-2026 13:00 - 14:00 0 MW

19-04-2026 14:00 - 15:00 0 MW

19-04-2026 15:00 - 16:00 0 MW

19-04-2026 16:00 - 17:00 0 MW

19-04-2026 17:00 - 18:00 0 MW

19-04-2026 18:00 - 19:00 241 MW

19-04-2026 19:00 - 20:00 241 MW

19-04-2026 20:00 - 21:00 241 MW

19-04-2026 21:00 - 22:00 241 MW

19-04-2026 22:00 - 23:00 241 MW

19-04-2026 23:00 - 24:00 241 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

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

FR-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

19-04-2026 10:00 - 11:00 448 MW

19-04-2026 11:00 - 12:00 448 MW

19-04-2026 12:00 - 13:00 448 MW

19-04-2026 13:00 - 14:00 448 MW

19-04-2026 14:00 - 15:00 448 MW

19-04-2026 15:00 - 16:00 448 MW

19-04-2026 16:00 - 17:00 448 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 10:00 - 11:00 22 MW

19-04-2026 11:00 - 12:00 22 MW

19-04-2026 12:00 - 13:00 22 MW

19-04-2026 13:00 - 14:00 22 MW

19-04-2026 14:00 - 15:00 22 MW

19-04-2026 15:00 - 16:00 22 MW

19-04-2026 16:00 - 17:00 22 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

1. TSO(s)*:

TERNA & APG

2. Identification of affected Long Term Transmission Rights:

AT-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

19-04-2026 10:00 - 11:00 65 MW

19-04-2026 11:00 - 12:00 65 MW

19-04-2026 12:00 - 13:00 65 MW

19-04-2026 13:00 - 14:00 65 MW

19-04-2026 14:00 - 15:00 65 MW

19-04-2026 15:00 - 16:00 65 MW

19-04-2026 16:00 - 17:00 65 MW

5. Amount of LTTR remaining after curtailment:

19-04-2026 10:00 - 11:00 0 MW

19-04-2026 11:00 - 12:00 0 MW

19-04-2026 12:00 - 13:00 0 MW

19-04-2026 13:00 - 14:00 0 MW

19-04-2026 14:00 - 15:00 0 MW

19-04-2026 15:00 - 16:00 0 MW

19-04-2026 16:00 - 17:00 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)*?

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

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.

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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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