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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 DK-NL border for delivery period 29-07-2026

Published: 27/07/2026 | 13:38 by JAO
Capacity Curtailment on the IT-FR border for delivery period 28-07-2026

Published: 27/07/2026 | 07:51 by JAO
Capacity Curtailment on the IT-SI border for delivery period 28-07-2026

Published: 27/07/2026 | 07:51 by JAO
Capacity Curtailment on the IT-CH border for delivery period 28-07-2026

Published: 27/07/2026 | 07:49 by JAO
Capacity Curtailment on the GR-IT border for delivery period 28-07-2026

Published: 27/07/2026 | 07:49 by JAO
Capacity Curtailment on the IT-GR border for delivery period 28-07-2026

Published: 27/07/2026 | 07:47 by JAO
Capacity Curtailment on the IT-AT border for delivery period 28-07-2026

Published: 27/07/2026 | 07:46 by JAO

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1. TSO(s)*:

TenneT_NL

2. Identification of affected Long Term Transmission Rights:

DK-NL

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

29-07-2026 07:00 - 08:00 199 MW

29-07-2026 08:00 - 09:00 199 MW

29-07-2026 09:00 - 10:00 199 MW

29-07-2026 10:00 - 11:00 199 MW

29-07-2026 11:00 - 12:00 199 MW

29-07-2026 12:00 - 13:00 199 MW

29-07-2026 13:00 - 14:00 199 MW

29-07-2026 14:00 - 15:00 199 MW

29-07-2026 15:00 - 16:00 199 MW

29-07-2026 16:00 - 17:00 199 MW

5. Amount of LTTR remaining after curtailment:

29-07-2026 07:00 - 08:00 0 MW

29-07-2026 08:00 - 09:00 0 MW

29-07-2026 09:00 - 10:00 0 MW

29-07-2026 10:00 - 11:00 0 MW

29-07-2026 11:00 - 12:00 0 MW

29-07-2026 12:00 - 13:00 0 MW

29-07-2026 13:00 - 14:00 0 MW

29-07-2026 14:00 - 15:00 0 MW

29-07-2026 15:00 - 16:00 0 MW

29-07-2026 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)*?

The remedial actions considered were assessed as not sufficient or ineffective to avoid the expected violation of operational security limit(s).

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:

28-07-2026 17:00 - 18:00 1370 MW

28-07-2026 18:00 - 19:00 1370 MW

28-07-2026 19:00 - 20:00 1370 MW

28-07-2026 20:00 - 21:00 1370 MW

28-07-2026 21:00 - 22:00 1370 MW

28-07-2026 22:00 - 23:00 1370 MW

5. Amount of LTTR remaining after curtailment:

28-07-2026 17:00 - 18:00 674 MW

28-07-2026 18:00 - 19:00 0 MW

28-07-2026 19:00 - 20:00 0 MW

28-07-2026 20:00 - 21:00 0 MW

28-07-2026 21:00 - 22:00 0 MW

28-07-2026 22:00 - 23:00 674 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

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:

28-07-2026 17:00 - 18:00 315 MW

28-07-2026 18:00 - 19:00 315 MW

28-07-2026 19:00 - 20:00 315 MW

28-07-2026 20:00 - 21:00 315 MW

28-07-2026 21:00 - 22:00 315 MW

28-07-2026 22:00 - 23:00 315 MW

5. Amount of LTTR remaining after curtailment:

28-07-2026 17:00 - 18:00 243 MW

28-07-2026 18:00 - 19:00 0 MW

28-07-2026 19:00 - 20:00 0 MW

28-07-2026 20:00 - 21:00 0 MW

28-07-2026 21:00 - 22:00 0 MW

28-07-2026 22:00 - 23:00 243 MW

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:

28-07-2026 17:00 - 18:00 719 MW

28-07-2026 18:00 - 19:00 719 MW

28-07-2026 19:00 - 20:00 719 MW

28-07-2026 20:00 - 21:00 719 MW

28-07-2026 21:00 - 22:00 719 MW

28-07-2026 22:00 - 23:00 719 MW

5. Amount of LTTR remaining after curtailment:

28-07-2026 17:00 - 18:00 591 MW

28-07-2026 18:00 - 19:00 0 MW

28-07-2026 19:00 - 20:00 0 MW

28-07-2026 20:00 - 21:00 0 MW

28-07-2026 21:00 - 22:00 0 MW

28-07-2026 22:00 - 23:00 591 MW

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:

28-07-2026 00:00 - 01:00 250 MW

28-07-2026 01:00 - 02:00 250 MW

28-07-2026 02:00 - 03:00 250 MW

28-07-2026 03:00 - 04:00 250 MW

28-07-2026 04:00 - 05:00 250 MW

28-07-2026 05:00 - 06:00 250 MW

28-07-2026 06:00 - 07:00 250 MW

28-07-2026 07:00 - 08:00 250 MW

28-07-2026 08:00 - 09:00 250 MW

28-07-2026 09:00 - 10:00 250 MW

28-07-2026 10:00 - 11:00 250 MW

28-07-2026 11:00 - 12:00 250 MW

28-07-2026 12:00 - 13:00 250 MW

28-07-2026 13:00 - 14:00 250 MW

28-07-2026 14:00 - 15:00 250 MW

28-07-2026 15:00 - 16:00 250 MW

28-07-2026 16:00 - 17:00 250 MW

28-07-2026 17:00 - 18:00 250 MW

28-07-2026 18:00 - 19:00 250 MW

28-07-2026 19:00 - 20:00 250 MW

28-07-2026 20:00 - 21:00 250 MW

28-07-2026 21:00 - 22:00 250 MW

28-07-2026 22:00 - 23:00 250 MW

28-07-2026 23:00 - 24:00 250 MW

5. Amount of LTTR remaining after curtailment:

28-07-2026 00:00 - 01:00 0 MW

28-07-2026 01:00 - 02:00 0 MW

28-07-2026 02:00 - 03:00 0 MW

28-07-2026 03:00 - 04:00 0 MW

28-07-2026 04:00 - 05:00 0 MW

28-07-2026 05:00 - 06:00 0 MW

28-07-2026 06:00 - 07:00 0 MW

28-07-2026 07:00 - 08:00 0 MW

28-07-2026 08:00 - 09:00 0 MW

28-07-2026 09:00 - 10:00 0 MW

28-07-2026 10:00 - 11:00 0 MW

28-07-2026 11:00 - 12:00 0 MW

28-07-2026 12:00 - 13:00 0 MW

28-07-2026 13:00 - 14:00 0 MW

28-07-2026 14:00 - 15:00 0 MW

28-07-2026 15:00 - 16:00 0 MW

28-07-2026 16:00 - 17:00 0 MW

28-07-2026 17:00 - 18:00 0 MW

28-07-2026 18:00 - 19:00 0 MW

28-07-2026 19:00 - 20:00 0 MW

28-07-2026 20:00 - 21:00 0 MW

28-07-2026 21:00 - 22:00 0 MW

28-07-2026 22:00 - 23:00 0 MW

28-07-2026 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*:
Outage 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:

IT-GR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

28-07-2026 00:00 - 01:00 250 MW

28-07-2026 01:00 - 02:00 250 MW

28-07-2026 02:00 - 03:00 250 MW

28-07-2026 03:00 - 04:00 250 MW

28-07-2026 04:00 - 05:00 250 MW

28-07-2026 05:00 - 06:00 250 MW

28-07-2026 06:00 - 07:00 250 MW

28-07-2026 07:00 - 08:00 250 MW

28-07-2026 08:00 - 09:00 250 MW

28-07-2026 09:00 - 10:00 250 MW

28-07-2026 10:00 - 11:00 250 MW

28-07-2026 11:00 - 12:00 250 MW

28-07-2026 12:00 - 13:00 250 MW

28-07-2026 13:00 - 14:00 250 MW

28-07-2026 14:00 - 15:00 250 MW

28-07-2026 15:00 - 16:00 250 MW

28-07-2026 16:00 - 17:00 250 MW

28-07-2026 17:00 - 18:00 250 MW

28-07-2026 18:00 - 19:00 250 MW

28-07-2026 19:00 - 20:00 250 MW

28-07-2026 20:00 - 21:00 250 MW

28-07-2026 21:00 - 22:00 250 MW

28-07-2026 22:00 - 23:00 250 MW

28-07-2026 23:00 - 24:00 250 MW

5. Amount of LTTR remaining after curtailment:

28-07-2026 00:00 - 01:00 0 MW

28-07-2026 01:00 - 02:00 0 MW

28-07-2026 02:00 - 03:00 0 MW

28-07-2026 03:00 - 04:00 0 MW

28-07-2026 04:00 - 05:00 0 MW

28-07-2026 05:00 - 06:00 0 MW

28-07-2026 06:00 - 07:00 0 MW

28-07-2026 07:00 - 08:00 0 MW

28-07-2026 08:00 - 09:00 0 MW

28-07-2026 09:00 - 10:00 0 MW

28-07-2026 10:00 - 11:00 0 MW

28-07-2026 11:00 - 12:00 0 MW

28-07-2026 12:00 - 13:00 0 MW

28-07-2026 13:00 - 14:00 0 MW

28-07-2026 14:00 - 15:00 0 MW

28-07-2026 15:00 - 16:00 0 MW

28-07-2026 16:00 - 17:00 0 MW

28-07-2026 17:00 - 18:00 0 MW

28-07-2026 18:00 - 19:00 0 MW

28-07-2026 19:00 - 20:00 0 MW

28-07-2026 20:00 - 21:00 0 MW

28-07-2026 21:00 - 22:00 0 MW

28-07-2026 22:00 - 23:00 0 MW

28-07-2026 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*:
Outage 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:

IT-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

28-07-2026 17:00 - 18:00 73 MW

28-07-2026 18:00 - 19:00 73 MW

28-07-2026 19:00 - 20:00 73 MW

28-07-2026 20:00 - 21:00 73 MW

28-07-2026 21:00 - 22:00 73 MW

28-07-2026 22:00 - 23:00 73 MW

5. Amount of LTTR remaining after curtailment:

28-07-2026 17:00 - 18:00 53 MW

28-07-2026 18:00 - 19:00 3 MW

28-07-2026 19:00 - 20:00 3 MW

28-07-2026 20:00 - 21:00 3 MW

28-07-2026 21:00 - 22:00 3 MW

28-07-2026 22:00 - 23:00 53 MW

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.

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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