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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 EE-LV border for delivery period 20-09-2025

Published: 19/09/2025 | 12:02 by JAO
Capacity Curtailment on the SI-AT border for delivery period 20-09-2025

Published: 19/09/2025 | 08:20 by JAO
Capacity Curtailment on the HU-AT border for delivery period 20-09-2025

Published: 19/09/2025 | 08:16 by JAO
Capacity Curtailment on the AT-CZ border for delivery period 20-09-2025

Published: 19/09/2025 | 08:14 by JAO
Capacity Curtailment on the AT-DE border for delivery period 20-09-2025

Published: 19/09/2025 | 07:46 by JAO
Capacity Curtailment on the FR-ES border for delivery period 20-09-2025

Published: 19/09/2025 | 07:42 by JAO
Capacity Curtailment on the IT-GR border for delivery period 20-09-2025

Published: 19/09/2025 | 07:32 by JAO

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1. TSO(s)*:

ELERING

2. Identification of affected Long Term Transmission Rights:

EE-LV

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

20-09-2025 00:00 - 01:00 500 MW

20-09-2025 01:00 - 02:00 500 MW

20-09-2025 02:00 - 03:00 500 MW

20-09-2025 03:00 - 04:00 500 MW

20-09-2025 04:00 - 05:00 500 MW

20-09-2025 05:00 - 06:00 500 MW

20-09-2025 06:00 - 07:00 500 MW

20-09-2025 09:00 - 10:00 500 MW

20-09-2025 10:00 - 11:00 500 MW

20-09-2025 11:00 - 12:00 500 MW

20-09-2025 12:00 - 13:00 500 MW

20-09-2025 13:00 - 14:00 500 MW

20-09-2025 14:00 - 15:00 500 MW

20-09-2025 19:00 - 20:00 500 MW

20-09-2025 20:00 - 21:00 500 MW

20-09-2025 21:00 - 22:00 500 MW

20-09-2025 22:00 - 23:00 500 MW

20-09-2025 23:00 - 24:00 500 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 00:00 - 01:00 451 MW

20-09-2025 01:00 - 02:00 450 MW

20-09-2025 02:00 - 03:00 451 MW

20-09-2025 03:00 - 04:00 453 MW

20-09-2025 04:00 - 05:00 454 MW

20-09-2025 05:00 - 06:00 454 MW

20-09-2025 06:00 - 07:00 454 MW

20-09-2025 09:00 - 10:00 465 MW

20-09-2025 10:00 - 11:00 465 MW

20-09-2025 11:00 - 12:00 458 MW

20-09-2025 12:00 - 13:00 458 MW

20-09-2025 13:00 - 14:00 458 MW

20-09-2025 14:00 - 15:00 458 MW

20-09-2025 19:00 - 20:00 458 MW

20-09-2025 20:00 - 21:00 458 MW

20-09-2025 21:00 - 22:00 458 MW

20-09-2025 22:00 - 23:00 454 MW

20-09-2025 23:00 - 24:00 450 MW

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

Please see the latest day-ahead net transfer capacity values published on the Nord Pool UMM Platform under "Unavailability of electricity facilities: Transmission EE → LV" at

https://umm.nordpoolgroup.com/#/messages?publicationDate=all&eventDate=custom&connections=EE-LV&eventDateStart=1970-01-01&eventDateStop=2125-04-20 , as well as the capacity already allocated on the Baltic Balancing Market for balancing capacity sharing at https://baltic.transparency-dashboard.eu/node/108

7. Why alternative measures are not sufficient to avoid the expected violation of operational security limit(s)*?

There is no alternative to the curtailment of the affected LTTRs

*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)*:

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:

20-09-2025 10:00 - 11:00 299 MW

20-09-2025 11:00 - 12:00 299 MW

20-09-2025 12:00 - 13:00 299 MW

20-09-2025 13:00 - 14:00 299 MW

20-09-2025 14:00 - 15:00 299 MW

20-09-2025 15:00 - 16:00 299 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 10:00 - 11:00 125 MW

20-09-2025 11:00 - 12:00 144 MW

20-09-2025 12:00 - 13:00 132 MW

20-09-2025 13:00 - 14:00 132 MW

20-09-2025 14:00 - 15:00 175 MW

20-09-2025 15:00 - 16:00 122 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)*:

APG

2. Identification of affected Long Term Transmission Rights:

HU-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

20-09-2025 10:00 - 11:00 259 MW

20-09-2025 11:00 - 12:00 259 MW

20-09-2025 12:00 - 13:00 259 MW

20-09-2025 13:00 - 14:00 259 MW

20-09-2025 15:00 - 16:00 259 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 10:00 - 11:00 219 MW

20-09-2025 11:00 - 12:00 234 MW

20-09-2025 12:00 - 13:00 228 MW

20-09-2025 13:00 - 14:00 228 MW

20-09-2025 15:00 - 16:00 208 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)*:

APG

2. Identification of affected Long Term Transmission Rights:

AT-CZ

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

20-09-2025 10:00 - 11:00 350 MW

20-09-2025 11:00 - 12:00 350 MW

20-09-2025 12:00 - 13:00 350 MW

20-09-2025 13:00 - 14:00 350 MW

20-09-2025 14:00 - 15:00 350 MW

20-09-2025 15:00 - 16:00 350 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 10:00 - 11:00 26 MW

20-09-2025 11:00 - 12:00 43 MW

20-09-2025 12:00 - 13:00 61 MW

20-09-2025 13:00 - 14:00 81 MW

20-09-2025 14:00 - 15:00 90 MW

20-09-2025 15:00 - 16:00 82 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)*:

APG

2. Identification of affected Long Term Transmission Rights:

AT-DE

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

20-09-2025 10:00 - 11:00 3819 MW

20-09-2025 11:00 - 12:00 3819 MW

20-09-2025 12:00 - 13:00 3819 MW

20-09-2025 13:00 - 14:00 3819 MW

20-09-2025 14:00 - 15:00 3819 MW

20-09-2025 15:00 - 16:00 3819 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 10:00 - 11:00 485 MW

20-09-2025 11:00 - 12:00 756 MW

20-09-2025 12:00 - 13:00 904 MW

20-09-2025 13:00 - 14:00 1264 MW

20-09-2025 14:00 - 15:00 1345 MW

20-09-2025 15:00 - 16:00 1274 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)*:

RTE-TSO, REE-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:

20-09-2025 19:00 - 20:00 1620 MW

20-09-2025 20:00 - 21:00 1620 MW

20-09-2025 21:00 - 22:00 1620 MW

20-09-2025 22:00 - 23:00 1620 MW

20-09-2025 23:00 - 24:00 1620 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 19:00 - 20:00 1326 MW

20-09-2025 20:00 - 21:00 1326 MW

20-09-2025 21:00 - 22:00 1326 MW

20-09-2025 22:00 - 23:00 1326 MW

20-09-2025 23:00 - 24:00 1326 MW

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

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:

IT-GR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

20-09-2025 00:00 - 01:00 500 MW

20-09-2025 01:00 - 02:00 500 MW

20-09-2025 02:00 - 03:00 500 MW

20-09-2025 03:00 - 04:00 500 MW

20-09-2025 04:00 - 05:00 500 MW

20-09-2025 05:00 - 06:00 500 MW

20-09-2025 06:00 - 07:00 500 MW

20-09-2025 07:00 - 08:00 500 MW

20-09-2025 08:00 - 09:00 500 MW

20-09-2025 09:00 - 10:00 500 MW

20-09-2025 10:00 - 11:00 500 MW

20-09-2025 11:00 - 12:00 500 MW

20-09-2025 12:00 - 13:00 500 MW

20-09-2025 13:00 - 14:00 500 MW

20-09-2025 14:00 - 15:00 500 MW

20-09-2025 15:00 - 16:00 500 MW

20-09-2025 16:00 - 17:00 500 MW

20-09-2025 17:00 - 18:00 500 MW

20-09-2025 18:00 - 19:00 500 MW

20-09-2025 19:00 - 20:00 500 MW

20-09-2025 20:00 - 21:00 500 MW

20-09-2025 21:00 - 22:00 500 MW

20-09-2025 22:00 - 23:00 500 MW

20-09-2025 23:00 - 24:00 500 MW

5. Amount of LTTR remaining after curtailment:

20-09-2025 00:00 - 01:00 0 MW

20-09-2025 01:00 - 02:00 0 MW

20-09-2025 02:00 - 03:00 0 MW

20-09-2025 03:00 - 04:00 0 MW

20-09-2025 04:00 - 05:00 0 MW

20-09-2025 05:00 - 06:00 0 MW

20-09-2025 06:00 - 07:00 0 MW

20-09-2025 07:00 - 08:00 0 MW

20-09-2025 08:00 - 09:00 0 MW

20-09-2025 09:00 - 10:00 0 MW

20-09-2025 10:00 - 11:00 0 MW

20-09-2025 11:00 - 12:00 0 MW

20-09-2025 12:00 - 13:00 0 MW

20-09-2025 13:00 - 14:00 0 MW

20-09-2025 14:00 - 15:00 0 MW

20-09-2025 15:00 - 16:00 0 MW

20-09-2025 16:00 - 17:00 0 MW

20-09-2025 17:00 - 18:00 0 MW

20-09-2025 18:00 - 19:00 0 MW

20-09-2025 19:00 - 20:00 0 MW

20-09-2025 20:00 - 21:00 0 MW

20-09-2025 21:00 - 22:00 0 MW

20-09-2025 22:00 - 23:00 0 MW

20-09-2025 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*:

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

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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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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