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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 CH-IT border for delivery period 30-12-2025

Published: 29/12/2025 | 07:50 by JAO
Capacity Curtailment on the SI-IT border for delivery period 30-12-2025

Published: 29/12/2025 | 07:49 by JAO
Capacity Curtailment on the AT-IT border for delivery period 30-12-2025

Published: 29/12/2025 | 07:48 by JAO
Capacity Curtailment on the CH-IT border for delivery period 29-12-2025

Published: 28/12/2025 | 07:42 by JAO
Capacity Curtailment on the SI-IT border for delivery period 29-12-2025

Published: 28/12/2025 | 07:34 by JAO
Capacity Curtailment on the AT-IT border for delivery period 29-12-2025

Published: 28/12/2025 | 07:33 by JAO
Capacity Curtailment on the SI-AT border for delivery period 28-12-2025

Published: 27/12/2025 | 08:32 by JAO

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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:

30-12-2025 02:00 - 03:00 1583 MW

30-12-2025 03:00 - 04:00 1583 MW

30-12-2025 04:00 - 05:00 1583 MW

30-12-2025 05:00 - 06:00 1583 MW

30-12-2025 06:00 - 07:00 1583 MW

30-12-2025 08:00 - 09:00 2859 MW

30-12-2025 09:00 - 10:00 2859 MW

30-12-2025 10:00 - 11:00 2859 MW

30-12-2025 11:00 - 12:00 2859 MW

30-12-2025 12:00 - 13:00 2859 MW

30-12-2025 13:00 - 14:00 2859 MW

30-12-2025 14:00 - 15:00 2859 MW

30-12-2025 15:00 - 16:00 2859 MW

30-12-2025 16:00 - 17:00 2859 MW

30-12-2025 17:00 - 18:00 2859 MW

30-12-2025 18:00 - 19:00 2859 MW

30-12-2025 19:00 - 20:00 2859 MW

30-12-2025 20:00 - 21:00 1583 MW

30-12-2025 23:00 - 24:00 1583 MW

5. Amount of LTTR remaining after curtailment:

30-12-2025 02:00 - 03:00 1525 MW

30-12-2025 03:00 - 04:00 1420 MW

30-12-2025 04:00 - 05:00 1420 MW

30-12-2025 05:00 - 06:00 1420 MW

30-12-2025 06:00 - 07:00 1420 MW

30-12-2025 08:00 - 09:00 1573 MW

30-12-2025 09:00 - 10:00 1548 MW

30-12-2025 10:00 - 11:00 1548 MW

30-12-2025 11:00 - 12:00 1548 MW

30-12-2025 12:00 - 13:00 1548 MW

30-12-2025 13:00 - 14:00 1548 MW

30-12-2025 14:00 - 15:00 1548 MW

30-12-2025 15:00 - 16:00 1548 MW

30-12-2025 16:00 - 17:00 1548 MW

30-12-2025 17:00 - 18:00 1548 MW

30-12-2025 18:00 - 19:00 1548 MW

30-12-2025 19:00 - 20:00 1548 MW

30-12-2025 20:00 - 21:00 1536 MW

30-12-2025 23:00 - 24:00 1484 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:

30-12-2025 00:00 - 01:00 271 MW

30-12-2025 01:00 - 02:00 271 MW

30-12-2025 02:00 - 03:00 271 MW

30-12-2025 03:00 - 04:00 271 MW

30-12-2025 04:00 - 05:00 271 MW

30-12-2025 05:00 - 06:00 271 MW

30-12-2025 06:00 - 07:00 271 MW

30-12-2025 07:00 - 08:00 271 MW

30-12-2025 08:00 - 09:00 271 MW

30-12-2025 09:00 - 10:00 271 MW

30-12-2025 10:00 - 11:00 271 MW

30-12-2025 11:00 - 12:00 271 MW

30-12-2025 12:00 - 13:00 271 MW

30-12-2025 13:00 - 14:00 271 MW

30-12-2025 14:00 - 15:00 271 MW

30-12-2025 15:00 - 16:00 271 MW

30-12-2025 16:00 - 17:00 271 MW

30-12-2025 17:00 - 18:00 271 MW

30-12-2025 18:00 - 19:00 271 MW

30-12-2025 19:00 - 20:00 271 MW

30-12-2025 20:00 - 21:00 271 MW

30-12-2025 21:00 - 22:00 271 MW

30-12-2025 22:00 - 23:00 271 MW

30-12-2025 23:00 - 24:00 271 MW

5. Amount of LTTR remaining after curtailment:

30-12-2025 00:00 - 01:00 114 MW

30-12-2025 01:00 - 02:00 114 MW

30-12-2025 02:00 - 03:00 110 MW

30-12-2025 03:00 - 04:00 235 MW

30-12-2025 04:00 - 05:00 235 MW

30-12-2025 05:00 - 06:00 235 MW

30-12-2025 06:00 - 07:00 235 MW

30-12-2025 07:00 - 08:00 116 MW

30-12-2025 08:00 - 09:00 116 MW

30-12-2025 09:00 - 10:00 115 MW

30-12-2025 10:00 - 11:00 115 MW

30-12-2025 11:00 - 12:00 115 MW

30-12-2025 12:00 - 13:00 108 MW

30-12-2025 13:00 - 14:00 108 MW

30-12-2025 14:00 - 15:00 108 MW

30-12-2025 15:00 - 16:00 108 MW

30-12-2025 16:00 - 17:00 108 MW

30-12-2025 17:00 - 18:00 108 MW

30-12-2025 18:00 - 19:00 108 MW

30-12-2025 19:00 - 20:00 108 MW

30-12-2025 20:00 - 21:00 108 MW

30-12-2025 21:00 - 22:00 108 MW

30-12-2025 22:00 - 23:00 108 MW

30-12-2025 23:00 - 24:00 109 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

*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:

30-12-2025 00:00 - 01:00 204 MW

30-12-2025 01:00 - 02:00 204 MW

30-12-2025 02:00 - 03:00 204 MW

30-12-2025 03:00 - 04:00 204 MW

30-12-2025 04:00 - 05:00 204 MW

30-12-2025 05:00 - 06:00 204 MW

30-12-2025 06:00 - 07:00 204 MW

30-12-2025 07:00 - 08:00 204 MW

30-12-2025 08:00 - 09:00 204 MW

30-12-2025 09:00 - 10:00 204 MW

30-12-2025 10:00 - 11:00 204 MW

30-12-2025 11:00 - 12:00 204 MW

30-12-2025 12:00 - 13:00 204 MW

30-12-2025 13:00 - 14:00 204 MW

30-12-2025 14:00 - 15:00 204 MW

30-12-2025 15:00 - 16:00 204 MW

30-12-2025 16:00 - 17:00 204 MW

30-12-2025 17:00 - 18:00 204 MW

30-12-2025 18:00 - 19:00 204 MW

30-12-2025 19:00 - 20:00 204 MW

30-12-2025 20:00 - 21:00 204 MW

30-12-2025 21:00 - 22:00 204 MW

30-12-2025 22:00 - 23:00 204 MW

30-12-2025 23:00 - 24:00 204 MW

5. Amount of LTTR remaining after curtailment:

30-12-2025 00:00 - 01:00 64 MW

30-12-2025 01:00 - 02:00 64 MW

30-12-2025 02:00 - 03:00 64 MW

30-12-2025 03:00 - 04:00 134 MW

30-12-2025 04:00 - 05:00 134 MW

30-12-2025 05:00 - 06:00 134 MW

30-12-2025 06:00 - 07:00 134 MW

30-12-2025 07:00 - 08:00 76 MW

30-12-2025 08:00 - 09:00 76 MW

30-12-2025 09:00 - 10:00 76 MW

30-12-2025 10:00 - 11:00 76 MW

30-12-2025 11:00 - 12:00 76 MW

30-12-2025 12:00 - 13:00 76 MW

30-12-2025 13:00 - 14:00 76 MW

30-12-2025 14:00 - 15:00 76 MW

30-12-2025 15:00 - 16:00 76 MW

30-12-2025 16:00 - 17:00 76 MW

30-12-2025 17:00 - 18:00 76 MW

30-12-2025 18:00 - 19:00 76 MW

30-12-2025 19:00 - 20:00 76 MW

30-12-2025 20:00 - 21:00 76 MW

30-12-2025 21:00 - 22:00 76 MW

30-12-2025 22:00 - 23:00 76 MW

30-12-2025 23:00 - 24:00 64 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

*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)*:

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:

29-12-2025 08:00 - 09:00 2859 MW

29-12-2025 09:00 - 10:00 2859 MW

29-12-2025 10:00 - 11:00 2859 MW

29-12-2025 11:00 - 12:00 2859 MW

29-12-2025 12:00 - 13:00 2859 MW

29-12-2025 13:00 - 14:00 2859 MW

29-12-2025 14:00 - 15:00 2859 MW

29-12-2025 15:00 - 16:00 2859 MW

29-12-2025 16:00 - 17:00 2859 MW

29-12-2025 17:00 - 18:00 2859 MW

29-12-2025 18:00 - 19:00 2859 MW

29-12-2025 19:00 - 20:00 2859 MW

5. Amount of LTTR remaining after curtailment:

29-12-2025 08:00 - 09:00 1769 MW

29-12-2025 09:00 - 10:00 1769 MW

29-12-2025 10:00 - 11:00 1769 MW

29-12-2025 11:00 - 12:00 1769 MW

29-12-2025 12:00 - 13:00 1769 MW

29-12-2025 13:00 - 14:00 1769 MW

29-12-2025 14:00 - 15:00 1769 MW

29-12-2025 15:00 - 16:00 1769 MW

29-12-2025 16:00 - 17:00 1769 MW

29-12-2025 17:00 - 18:00 1769 MW

29-12-2025 18:00 - 19:00 1769 MW

29-12-2025 19:00 - 20:00 1720 MW

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:

29-12-2025 00:00 - 01:00 271 MW

29-12-2025 01:00 - 02:00 271 MW

29-12-2025 02:00 - 03:00 271 MW

29-12-2025 03:00 - 04:00 271 MW

29-12-2025 04:00 - 05:00 271 MW

29-12-2025 05:00 - 06:00 271 MW

29-12-2025 06:00 - 07:00 271 MW

29-12-2025 07:00 - 08:00 271 MW

29-12-2025 08:00 - 09:00 271 MW

29-12-2025 09:00 - 10:00 271 MW

29-12-2025 10:00 - 11:00 271 MW

29-12-2025 11:00 - 12:00 271 MW

29-12-2025 12:00 - 13:00 271 MW

29-12-2025 13:00 - 14:00 271 MW

29-12-2025 14:00 - 15:00 271 MW

29-12-2025 15:00 - 16:00 271 MW

29-12-2025 16:00 - 17:00 271 MW

29-12-2025 17:00 - 18:00 271 MW

29-12-2025 18:00 - 19:00 271 MW

29-12-2025 19:00 - 20:00 271 MW

29-12-2025 20:00 - 21:00 271 MW

29-12-2025 21:00 - 22:00 271 MW

29-12-2025 22:00 - 23:00 271 MW

29-12-2025 23:00 - 24:00 271 MW

5. Amount of LTTR remaining after curtailment:

29-12-2025 00:00 - 01:00 115 MW

29-12-2025 01:00 - 02:00 129 MW

29-12-2025 02:00 - 03:00 129 MW

29-12-2025 03:00 - 04:00 110 MW

29-12-2025 04:00 - 05:00 110 MW

29-12-2025 05:00 - 06:00 110 MW

29-12-2025 06:00 - 07:00 110 MW

29-12-2025 07:00 - 08:00 136 MW

29-12-2025 08:00 - 09:00 136 MW

29-12-2025 09:00 - 10:00 116 MW

29-12-2025 10:00 - 11:00 116 MW

29-12-2025 11:00 - 12:00 116 MW

29-12-2025 12:00 - 13:00 116 MW

29-12-2025 13:00 - 14:00 116 MW

29-12-2025 14:00 - 15:00 116 MW

29-12-2025 15:00 - 16:00 138 MW

29-12-2025 16:00 - 17:00 138 MW

29-12-2025 17:00 - 18:00 138 MW

29-12-2025 18:00 - 19:00 134 MW

29-12-2025 19:00 - 20:00 130 MW

29-12-2025 20:00 - 21:00 130 MW

29-12-2025 21:00 - 22:00 134 MW

29-12-2025 22:00 - 23:00 134 MW

29-12-2025 23:00 - 24:00 128 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:

AT-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

29-12-2025 00:00 - 01:00 204 MW

29-12-2025 01:00 - 02:00 204 MW

29-12-2025 02:00 - 03:00 204 MW

29-12-2025 03:00 - 04:00 204 MW

29-12-2025 04:00 - 05:00 204 MW

29-12-2025 05:00 - 06:00 204 MW

29-12-2025 06:00 - 07:00 204 MW

29-12-2025 07:00 - 08:00 204 MW

29-12-2025 08:00 - 09:00 204 MW

29-12-2025 09:00 - 10:00 204 MW

29-12-2025 10:00 - 11:00 204 MW

29-12-2025 11:00 - 12:00 204 MW

29-12-2025 12:00 - 13:00 204 MW

29-12-2025 13:00 - 14:00 204 MW

29-12-2025 14:00 - 15:00 204 MW

29-12-2025 15:00 - 16:00 204 MW

29-12-2025 16:00 - 17:00 204 MW

29-12-2025 17:00 - 18:00 204 MW

29-12-2025 18:00 - 19:00 204 MW

29-12-2025 19:00 - 20:00 204 MW

29-12-2025 20:00 - 21:00 204 MW

29-12-2025 21:00 - 22:00 204 MW

29-12-2025 22:00 - 23:00 204 MW

29-12-2025 23:00 - 24:00 204 MW

5. Amount of LTTR remaining after curtailment:

29-12-2025 00:00 - 01:00 64 MW

29-12-2025 01:00 - 02:00 76 MW

29-12-2025 02:00 - 03:00 76 MW

29-12-2025 03:00 - 04:00 76 MW

29-12-2025 04:00 - 05:00 76 MW

29-12-2025 05:00 - 06:00 76 MW

29-12-2025 06:00 - 07:00 76 MW

29-12-2025 07:00 - 08:00 76 MW

29-12-2025 08:00 - 09:00 76 MW

29-12-2025 09:00 - 10:00 83 MW

29-12-2025 10:00 - 11:00 83 MW

29-12-2025 11:00 - 12:00 83 MW

29-12-2025 12:00 - 13:00 83 MW

29-12-2025 13:00 - 14:00 83 MW

29-12-2025 14:00 - 15:00 83 MW

29-12-2025 15:00 - 16:00 76 MW

29-12-2025 16:00 - 17:00 76 MW

29-12-2025 17:00 - 18:00 76 MW

29-12-2025 18:00 - 19:00 83 MW

29-12-2025 19:00 - 20:00 81 MW

29-12-2025 20:00 - 21:00 81 MW

29-12-2025 21:00 - 22:00 76 MW

29-12-2025 22:00 - 23:00 76 MW

29-12-2025 23:00 - 24:00 64 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)*:

APG

2. Identification of affected Long Term Transmission Rights:

SI-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

28-12-2025 02:00 - 03:00 399 MW

28-12-2025 03:00 - 04:00 399 MW

28-12-2025 04:00 - 05:00 399 MW

28-12-2025 05:00 - 06:00 399 MW

28-12-2025 06:00 - 07:00 399 MW

28-12-2025 07:00 - 08:00 399 MW

28-12-2025 08:00 - 09:00 399 MW

28-12-2025 09:00 - 10:00 399 MW

28-12-2025 10:00 - 11:00 399 MW

28-12-2025 11:00 - 12:00 399 MW

28-12-2025 12:00 - 13:00 399 MW

5. Amount of LTTR remaining after curtailment:

28-12-2025 02:00 - 03:00 364 MW

28-12-2025 03:00 - 04:00 364 MW

28-12-2025 04:00 - 05:00 364 MW

28-12-2025 05:00 - 06:00 360 MW

28-12-2025 06:00 - 07:00 364 MW

28-12-2025 07:00 - 08:00 358 MW

28-12-2025 08:00 - 09:00 346 MW

28-12-2025 09:00 - 10:00 194 MW

28-12-2025 10:00 - 11:00 252 MW

28-12-2025 11:00 - 12:00 199 MW

28-12-2025 12:00 - 13:00 236 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.

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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.

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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