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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 FR-ES border for delivery period 10-08-2026

Published: 09/08/2026 | 07:25 by JAO
Capacity Curtailment on the ES-FR border for delivery period 10-08-2026

Published: 09/08/2026 | 07:24 by JAO
Capacity Curtailment on the FR-CH border for delivery period 10-08-2026

Published: 08/08/2026 | 18:29 by JAO
Capacity Curtailment on the SI-IT border for delivery period 09-08-2026

Published: 08/08/2026 | 07:34 by JAO
Capacity Curtailment on the IT-SI border for delivery period 09-08-2026

Published: 08/08/2026 | 07:33 by JAO
Capacity Curtailment on the FR-CH border for delivery period 09-08-2026

Published: 07/08/2026 | 17:03 by JAO
Capacity Curtailment on the IF1-GB-FR border for delivery period 09-08-2026 - 14-08-2026

Published: 07/08/2026 | 13:31 by JAO

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1. TSO(s)*:

RTE-TSO

2. Identification of affected Long Term Transmission Rights:

FR-ES

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

10-08-2026 08:00 - 09:00 1559 MW

10-08-2026 09:00 - 10:00 1559 MW

10-08-2026 10:00 - 11:00 1559 MW

10-08-2026 11:00 - 12:00 1559 MW

10-08-2026 12:00 - 13:00 1559 MW

10-08-2026 13:00 - 14:00 1559 MW

10-08-2026 14:00 - 15:00 1559 MW

10-08-2026 15:00 - 16:00 1559 MW

10-08-2026 16:00 - 17:00 1559 MW

10-08-2026 17:00 - 18:00 1559 MW

10-08-2026 18:00 - 19:00 1559 MW

10-08-2026 19:00 - 20:00 1559 MW

10-08-2026 20:00 - 21:00 1559 MW

5. Amount of LTTR remaining after curtailment:

10-08-2026 08:00 - 09:00 1171 MW

10-08-2026 09:00 - 10:00 1171 MW

10-08-2026 10:00 - 11:00 1171 MW

10-08-2026 11:00 - 12:00 1171 MW

10-08-2026 12:00 - 13:00 1171 MW

10-08-2026 13:00 - 14:00 1171 MW

10-08-2026 14:00 - 15:00 1171 MW

10-08-2026 15:00 - 16:00 1171 MW

10-08-2026 16:00 - 17:00 1171 MW

10-08-2026 17:00 - 18:00 1171 MW

10-08-2026 18:00 - 19:00 1171 MW

10-08-2026 19:00 - 20:00 1171 MW

10-08-2026 20:00 - 21:00 1171 MW

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

10/08/2026

08:00-09:00 BRAUD - CUBNEZAIS 4

09:00-10:00 BRAUD - CUBNEZAIS 4

10:00-11:00 BRAUD - CUBNEZAIS 4

11:00-12:00 BRAUD - CUBNEZAIS 4

12:00-13:00 BRAUD - CUBNEZAIS 4

13:00-14:00 BRAUD - CUBNEZAIS 4

14:00-15:00 BRAUD - CUBNEZAIS 4

15:00-16:00 BRAUD - CUBNEZAIS 4

16:00-17:00 BRAUD - CUBNEZAIS 4

17:00-18:00 BRAUD - CUBNEZAIS 4

18:00-19:00 BRAUD - CUBNEZAIS 4

19:00-20:00 BRAUD - CUBNEZAIS 4

20:00-21:00 BRAUD - CUBNEZAIS 4

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

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:

10-08-2026 11:00 - 12:00 674 MW

10-08-2026 12:00 - 13:00 674 MW

10-08-2026 13:00 - 14:00 674 MW

10-08-2026 14:00 - 15:00 674 MW

10-08-2026 15:00 - 16:00 674 MW

10-08-2026 16:00 - 17:00 674 MW

5. Amount of LTTR remaining after curtailment:

10-08-2026 11:00 - 12:00 276 MW

10-08-2026 12:00 - 13:00 276 MW

10-08-2026 13:00 - 14:00 276 MW

10-08-2026 14:00 - 15:00 276 MW

10-08-2026 15:00 - 16:00 276 MW

10-08-2026 16:00 - 17:00 276 MW

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

10/08/2026

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

1. TSO(s)*:

RTE, SWISSGRID

2. Identification of affected Long Term Transmission Rights:

FR-CH

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

10-08-2026 00:00 - 01:00 370 MW

10-08-2026 01:00 - 02:00 370 MW

10-08-2026 02:00 - 03:00 370 MW

10-08-2026 03:00 - 04:00 370 MW

10-08-2026 04:00 - 05:00 370 MW

10-08-2026 05:00 - 06:00 370 MW

10-08-2026 06:00 - 07:00 370 MW

10-08-2026 07:00 - 08:00 370 MW

10-08-2026 08:00 - 09:00 370 MW

10-08-2026 09:00 - 10:00 370 MW

10-08-2026 10:00 - 11:00 370 MW

10-08-2026 11:00 - 12:00 370 MW

10-08-2026 12:00 - 13:00 370 MW

10-08-2026 13:00 - 14:00 370 MW

10-08-2026 14:00 - 15:00 370 MW

10-08-2026 15:00 - 16:00 370 MW

10-08-2026 16:00 - 17:00 370 MW

10-08-2026 17:00 - 18:00 370 MW

10-08-2026 18:00 - 19:00 370 MW

10-08-2026 19:00 - 20:00 370 MW

10-08-2026 20:00 - 21:00 370 MW

10-08-2026 21:00 - 22:00 370 MW

10-08-2026 22:00 - 23:00 370 MW

10-08-2026 23:00 - 24:00 370 MW

5. Amount of LTTR remaining after curtailment:

10-08-2026 00:00 - 01:00 0 MW

10-08-2026 01:00 - 02:00 0 MW

10-08-2026 02:00 - 03:00 0 MW

10-08-2026 03:00 - 04:00 0 MW

10-08-2026 04:00 - 05:00 0 MW

10-08-2026 05:00 - 06:00 0 MW

10-08-2026 06:00 - 07:00 0 MW

10-08-2026 07:00 - 08:00 0 MW

10-08-2026 08:00 - 09:00 0 MW

10-08-2026 09:00 - 10:00 0 MW

10-08-2026 10:00 - 11:00 0 MW

10-08-2026 11:00 - 12:00 0 MW

10-08-2026 12:00 - 13:00 0 MW

10-08-2026 13:00 - 14:00 0 MW

10-08-2026 14:00 - 15:00 0 MW

10-08-2026 15:00 - 16:00 0 MW

10-08-2026 16:00 - 17:00 0 MW

10-08-2026 17:00 - 18:00 0 MW

10-08-2026 18:00 - 19:00 0 MW

10-08-2026 19:00 - 20:00 0 MW

10-08-2026 20:00 - 21:00 0 MW

10-08-2026 21:00 - 22:00 0 MW

10-08-2026 22:00 - 23:00 0 MW

10-08-2026 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*:

10/08/2026

00:00-01:00 Network Security

01:00-02:00 Network Security

02:00-03:00 Network Security

03:00-04:00 Network Security

04:00-05:00 Network Security

05:00-06:00 Network Security

06:00-07:00 Network Security

07:00-08:00 Network Security

08:00-09:00 Network Security

09:00-10:00 Network Security

10:00-11:00 Network Security

11:00-12:00 Network Security

12:00-13:00 Network Security

13:00-14:00 Network Security

14:00-15:00 Network Security

15:00-16:00 Network Security

16:00-17:00 Network Security

17:00-18:00 Network Security

18:00-19:00 Network Security

19:00-20:00 Network Security

20:00-21:00 Network Security

21:00-22:00 Network Security

22:00-23:00 Network Security

23:00-24:00 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

*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

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:

09-08-2026 00:00 - 01:00 59 MW

09-08-2026 01:00 - 02:00 59 MW

09-08-2026 02:00 - 03:00 59 MW

09-08-2026 03:00 - 04:00 59 MW

09-08-2026 04:00 - 05:00 59 MW

09-08-2026 05:00 - 06:00 59 MW

09-08-2026 06:00 - 07:00 59 MW

09-08-2026 07:00 - 08:00 59 MW

09-08-2026 08:00 - 09:00 59 MW

09-08-2026 09:00 - 10:00 59 MW

09-08-2026 10:00 - 11:00 59 MW

09-08-2026 11:00 - 12:00 59 MW

09-08-2026 12:00 - 13:00 59 MW

09-08-2026 13:00 - 14:00 59 MW

09-08-2026 14:00 - 15:00 59 MW

09-08-2026 15:00 - 16:00 59 MW

09-08-2026 16:00 - 17:00 59 MW

5. Amount of LTTR remaining after curtailment:

09-08-2026 00:00 - 01:00 0 MW

09-08-2026 01:00 - 02:00 0 MW

09-08-2026 02:00 - 03:00 0 MW

09-08-2026 03:00 - 04:00 0 MW

09-08-2026 04:00 - 05:00 0 MW

09-08-2026 05:00 - 06:00 0 MW

09-08-2026 06:00 - 07:00 0 MW

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

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

09-08-2026 09:00 - 10:00 0 MW

09-08-2026 10:00 - 11:00 0 MW

09-08-2026 11:00 - 12:00 0 MW

09-08-2026 12:00 - 13:00 0 MW

09-08-2026 13:00 - 14:00 0 MW

09-08-2026 14:00 - 15:00 0 MW

09-08-2026 15:00 - 16:00 0 MW

09-08-2026 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*:

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

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:

09-08-2026 00:00 - 01:00 127 MW

09-08-2026 01:00 - 02:00 127 MW

09-08-2026 02:00 - 03:00 127 MW

09-08-2026 03:00 - 04:00 127 MW

09-08-2026 04:00 - 05:00 127 MW

09-08-2026 05:00 - 06:00 127 MW

09-08-2026 06:00 - 07:00 127 MW

09-08-2026 07:00 - 08:00 127 MW

09-08-2026 08:00 - 09:00 127 MW

09-08-2026 09:00 - 10:00 127 MW

09-08-2026 10:00 - 11:00 127 MW

09-08-2026 11:00 - 12:00 127 MW

09-08-2026 12:00 - 13:00 127 MW

09-08-2026 13:00 - 14:00 127 MW

09-08-2026 14:00 - 15:00 127 MW

09-08-2026 15:00 - 16:00 127 MW

09-08-2026 16:00 - 17:00 127 MW

5. Amount of LTTR remaining after curtailment:

09-08-2026 00:00 - 01:00 0 MW

09-08-2026 01:00 - 02:00 0 MW

09-08-2026 02:00 - 03:00 0 MW

09-08-2026 03:00 - 04:00 0 MW

09-08-2026 04:00 - 05:00 0 MW

09-08-2026 05:00 - 06:00 0 MW

09-08-2026 06:00 - 07:00 0 MW

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

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

09-08-2026 09:00 - 10:00 0 MW

09-08-2026 10:00 - 11:00 0 MW

09-08-2026 11:00 - 12:00 0 MW

09-08-2026 12:00 - 13:00 0 MW

09-08-2026 13:00 - 14:00 0 MW

09-08-2026 14:00 - 15:00 0 MW

09-08-2026 15:00 - 16:00 0 MW

09-08-2026 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*:

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

1. TSO(s)*:

RTE-TSO

2. Identification of affected Long Term Transmission Rights:

FR-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:

09-08-2026 00:00 - 01:00 370 MW

09-08-2026 01:00 - 02:00 370 MW

09-08-2026 02:00 - 03:00 370 MW

09-08-2026 03:00 - 04:00 370 MW

09-08-2026 04:00 - 05:00 370 MW

09-08-2026 05:00 - 06:00 370 MW

09-08-2026 06:00 - 07:00 370 MW

09-08-2026 07:00 - 08:00 370 MW

09-08-2026 08:00 - 09:00 370 MW

09-08-2026 09:00 - 10:00 370 MW

09-08-2026 10:00 - 11:00 370 MW

09-08-2026 11:00 - 12:00 370 MW

09-08-2026 12:00 - 13:00 370 MW

09-08-2026 13:00 - 14:00 370 MW

09-08-2026 14:00 - 15:00 370 MW

09-08-2026 15:00 - 16:00 370 MW

09-08-2026 16:00 - 17:00 370 MW

09-08-2026 17:00 - 18:00 370 MW

09-08-2026 18:00 - 19:00 370 MW

09-08-2026 19:00 - 20:00 370 MW

09-08-2026 20:00 - 21:00 370 MW

09-08-2026 21:00 - 22:00 370 MW

09-08-2026 22:00 - 23:00 370 MW

09-08-2026 23:00 - 24:00 370 MW

5. Amount of LTTR remaining after curtailment:

09-08-2026 00:00 - 01:00 0 MW

09-08-2026 01:00 - 02:00 0 MW

09-08-2026 02:00 - 03:00 0 MW

09-08-2026 03:00 - 04:00 0 MW

09-08-2026 04:00 - 05:00 0 MW

09-08-2026 05:00 - 06:00 0 MW

09-08-2026 06:00 - 07:00 0 MW

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

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

09-08-2026 09:00 - 10:00 0 MW

09-08-2026 10:00 - 11:00 0 MW

09-08-2026 11:00 - 12:00 0 MW

09-08-2026 12:00 - 13:00 0 MW

09-08-2026 13:00 - 14:00 0 MW

09-08-2026 14:00 - 15:00 0 MW

09-08-2026 15:00 - 16:00 0 MW

09-08-2026 16:00 - 17:00 0 MW

09-08-2026 17:00 - 18:00 0 MW

09-08-2026 18:00 - 19:00 0 MW

09-08-2026 19:00 - 20:00 0 MW

09-08-2026 20:00 - 21:00 0 MW

09-08-2026 21:00 - 22:00 0 MW

09-08-2026 22:00 - 23:00 0 MW

09-08-2026 23:00 - 24:00 0 MW

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:

09-08-2026 - 14-08-2026 00:00 - 01:00 1896 MW

09-08-2026 - 14-08-2026 01:00 - 02:00 1896 MW

09-08-2026 - 14-08-2026 02:00 - 03:00 1896 MW

09-08-2026 - 14-08-2026 03:00 - 04:00 1896 MW

09-08-2026 - 14-08-2026 04:00 - 05:00 1896 MW

09-08-2026 - 14-08-202605:00 - 06:00 1896 MW

09-08-2026 - 14-08-2026 06:00 - 07:00 1896 MW

09-08-2026 - 14-08-2026 07:00 - 08:00 1896 MW

09-08-2026 - 14-08-2026 08:00 - 09:00 1896 MW

09-08-2026 - 14-08-2026 09:00 - 10:00 1896 MW

09-08-2026 - 14-08-2026 10:00 - 11:00 1896 MW

09-08-2026 - 14-08-2026 11:00 - 12:00 1896 MW

09-08-2026 - 14-08-2026 12:00 - 13:00 1896 MW

09-08-2026 - 14-08-2026 13:00 - 14:00 1896 MW

09-08-2026 - 14-08-2026 14:00 - 15:00 1896 MW

09-08-2026 - 14-08-2026 15:00 - 16:00 1896 MW

09-08-2026 - 14-08-2026 16:00 - 17:00 1896 MW

09-08-2026 - 14-08-2026 17:00 - 18:00 1896 MW

09-08-2026 - 14-08-2026 18:00 - 19:00 1896 MW

09-08-2026 - 14-08-2026 19:00 - 20:00 1896 MW

09-08-2026 - 14-08-2026 20:00 - 21:00 1896 MW

09-08-2026 - 14-08-2026 21:00 - 22:00 1896 MW

09-08-2026 - 14-08-2026 22:00 - 23:00 1896 MW

09-08-2026 - 14-08-2026 23:00 - 24:00 1896 MW

5. Amount of LTTR remaining after curtailment:

09-08-2026 - 14-08-202600:00 - 01:00 923 MW

09-08-2026 - 14-08-2026 01:00 - 02:00 923 MW

09-08-2026 - 14-08-2026 02:00 - 03:00 923 MW

09-08-2026 - 14-08-2026 03:00 - 04:00 923 MW

09-08-2026 - 14-08-2026 04:00 - 05:00 923 MW

09-08-2026 - 14-08-2026 05:00 - 06:00 923 MW

09-08-2026 - 14-08-2026 06:00 - 07:00 923 MW

09-08-2026 - 14-08-2026 07:00 - 08:00 923 MW

09-08-2026 - 14-08-2026 08:00 - 09:00 923 MW

09-08-2026 - 14-08-2026 09:00 - 10:00 923 MW

09-08-2026 - 14-08-2026 10:00 - 11:00 923 MW

09-08-2026 - 14-08-2026 11:00 - 12:00 923 MW

09-08-2026 - 14-08-2026 12:00 - 13:00 923 MW

09-08-2026 - 14-08-2026 13:00 - 14:00 923 MW

09-08-2026 - 14-08-2026 14:00 - 15:00 923 MW

09-08-2026 - 14-08-2026 15:00 - 16:00 923 MW

09-08-2026 - 14-08-2026 16:00 - 17:00 923 MW

09-08-2026 - 14-08-2026 17:00 - 18:00 923 MW

09-08-2026 - 14-08-2026 18:00 - 19:00 923 MW

09-08-2026 - 14-08-2026 19:00 - 20:00 923 MW

09-08-2026 - 14-08-2026 20:00 - 21:00 923 MW

09-08-2026 - 14-08-2026 21:00 - 22:00 923 MW

09-08-2026 - 14-08-2026 22:00 - 23:00 923 MW

09-08-2026 - 14-08-2026 23:00 - 24:00 923 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 Planned maintenance

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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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