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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 IT-AT border for delivery period 23-06-2025

Published: 21/06/2025 | 15:10 by JAO
Capacity Curtailment on the GR-BG border for delivery period 24-06-2025

Published: 21/06/2025 | 10:56 by JAO
Capacity Curtailment on the GR-BG border for delivery period 25-06-2025

Published: 21/06/2025 | 10:56 by JAO
Capacity Curtailment on the BG-GR border for delivery period 24-06-2025

Published: 21/06/2025 | 10:56 by JAO
Capacity Curtailment on the BG-GR border for delivery period 25-06-2025

Published: 21/06/2025 | 10:56 by JAO
Capacity Curtailment on the BG-GR border for delivery period 23-06-2025

Published: 21/06/2025 | 10:52 by JAO
Capacity Curtailment on the GR-BG border for delivery period 23-06-2025

Published: 21/06/2025 | 10:52 by JAO

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1. TSO(s)*:

APG

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:

23-06-2025 07:00 - 08:00 74 MW

23-06-2025 08:00 - 09:00 74 MW

23-06-2025 09:00 - 10:00 74 MW

23-06-2025 10:00 - 11:00 74 MW

23-06-2025 11:00 - 12:00 74 MW

23-06-2025 12:00 - 13:00 74 MW

23-06-2025 13:00 - 14:00 74 MW

23-06-2025 14:00 - 15:00 74 MW

23-06-2025 15:00 - 16:00 74 MW

23-06-2025 16:00 - 17:00 74 MW

5. Amount of LTTR remaining after curtailment:

23-06-2025 07:00 - 08:00 57 MW

23-06-2025 08:00 - 09:00 57 MW

23-06-2025 09:00 - 10:00 57 MW

23-06-2025 10:00 - 11:00 57 MW

23-06-2025 11:00 - 12:00 57 MW

23-06-2025 12:00 - 13:00 57 MW

23-06-2025 13:00 - 14:00 57 MW

23-06-2025 14:00 - 15:00 57 MW

23-06-2025 15:00 - 16:00 57 MW

23-06-2025 16:00 - 17:00 57 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)*:

IPTO (ADMIE) & ESO

2. Identification of affected Long Term Transmission Rights:

GR-BG

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

24-06-2025 06:00 - 07:00 700 MW

24-06-2025 07:00 - 08:00 700 MW

24-06-2025 08:00 - 09:00 700 MW

24-06-2025 09:00 - 10:00 700 MW

24-06-2025 10:00 - 11:00 700 MW

24-06-2025 11:00 - 12:00 700 MW

24-06-2025 12:00 - 13:00 700 MW

24-06-2025 13:00 - 14:00 700 MW

24-06-2025 14:00 - 15:00 700 MW

5. Amount of LTTR remaining after curtailment:

24-06-2025 06:00 - 07:00 337 MW

24-06-2025 07:00 - 08:00 337 MW

24-06-2025 08:00 - 09:00 337 MW

24-06-2025 09:00 - 10:00 337 MW

24-06-2025 10:00 - 11:00 337 MW

24-06-2025 11:00 - 12:00 337 MW

24-06-2025 12:00 - 13:00 337 MW

24-06-2025 13:00 - 14:00 337 MW

24-06-2025 14:00 - 15:00 337 MW

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

For 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)*:

IPTO (ADMIE) & ESO

2. Identification of affected Long Term Transmission Rights:

GR-BG

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

25-06-2025 06:00 - 07:00 700 MW

25-06-2025 07:00 - 08:00 700 MW

25-06-2025 08:00 - 09:00 700 MW

25-06-2025 09:00 - 10:00 700 MW

25-06-2025 10:00 - 11:00 700 MW

25-06-2025 11:00 - 12:00 700 MW

25-06-2025 12:00 - 13:00 700 MW

25-06-2025 13:00 - 14:00 700 MW

25-06-2025 14:00 - 15:00 700 MW

5. Amount of LTTR remaining after curtailment:

25-06-2025 06:00 - 07:00 337 MW

25-06-2025 07:00 - 08:00 337 MW

25-06-2025 08:00 - 09:00 337 MW

25-06-2025 09:00 - 10:00 337 MW

25-06-2025 10:00 - 11:00 337 MW

25-06-2025 11:00 - 12:00 337 MW

25-06-2025 12:00 - 13:00 337 MW

25-06-2025 13:00 - 14:00 337 MW

25-06-2025 14:00 - 15:00 337 MW

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

For 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)*:

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:

24-06-2025 06:00 - 07:00 1000 MW

24-06-2025 07:00 - 08:00 1000 MW

24-06-2025 08:00 - 09:00 1000 MW

24-06-2025 09:00 - 10:00 1000 MW

24-06-2025 10:00 - 11:00 1000 MW

24-06-2025 11:00 - 12:00 1000 MW

24-06-2025 12:00 - 13:00 1000 MW

24-06-2025 13:00 - 14:00 1000 MW

24-06-2025 14:00 - 15:00 1000 MW

5. Amount of LTTR remaining after curtailment:

24-06-2025 06:00 - 07:00 322 MW

24-06-2025 07:00 - 08:00 322 MW

24-06-2025 08:00 - 09:00 322 MW

24-06-2025 09:00 - 10:00 322 MW

24-06-2025 10:00 - 11:00 322 MW

24-06-2025 11:00 - 12:00 322 MW

24-06-2025 12:00 - 13:00 322 MW

24-06-2025 13:00 - 14:00 322 MW

24-06-2025 14:00 - 15:00 322 MW

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

For 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)*:

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:

25-06-2025 06:00 - 07:00 1000 MW

25-06-2025 07:00 - 08:00 1000 MW

25-06-2025 08:00 - 09:00 1000 MW

25-06-2025 09:00 - 10:00 1000 MW

25-06-2025 10:00 - 11:00 1000 MW

25-06-2025 11:00 - 12:00 1000 MW

25-06-2025 12:00 - 13:00 1000 MW

25-06-2025 13:00 - 14:00 1000 MW

25-06-2025 14:00 - 15:00 1000 MW

5. Amount of LTTR remaining after curtailment:

25-06-2025 06:00 - 07:00 322 MW

25-06-2025 07:00 - 08:00 322 MW

25-06-2025 08:00 - 09:00 322 MW

25-06-2025 09:00 - 10:00 322 MW

25-06-2025 10:00 - 11:00 322 MW

25-06-2025 11:00 - 12:00 322 MW

25-06-2025 12:00 - 13:00 322 MW

25-06-2025 13:00 - 14:00 322 MW

25-06-2025 14:00 - 15:00 322 MW

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

For 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)*:

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:

23-06-2025 06:00 - 07:00 1000 MW

23-06-2025 07:00 - 08:00 1000 MW

23-06-2025 08:00 - 09:00 1000 MW

23-06-2025 09:00 - 10:00 1000 MW

23-06-2025 10:00 - 11:00 1000 MW

23-06-2025 11:00 - 12:00 1000 MW

23-06-2025 12:00 - 13:00 1000 MW

23-06-2025 13:00 - 14:00 1000 MW

23-06-2025 14:00 - 15:00 1000 MW

5. Amount of LTTR remaining after curtailment:

23-06-2025 06:00 - 07:00 322 MW

23-06-2025 07:00 - 08:00 322 MW

23-06-2025 08:00 - 09:00 322 MW

23-06-2025 09:00 - 10:00 322 MW

23-06-2025 10:00 - 11:00 322 MW

23-06-2025 11:00 - 12:00 322 MW

23-06-2025 12:00 - 13:00 322 MW

23-06-2025 13:00 - 14:00 322 MW

23-06-2025 14:00 - 15:00 322 MW

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

For 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)*:

IPTO (ADMIE) & ESO

2. Identification of affected Long Term Transmission Rights:

GR-BG

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

23-06-2025 06:00 - 07:00 700 MW

23-06-2025 07:00 - 08:00 700 MW

23-06-2025 08:00 - 09:00 700 MW

23-06-2025 09:00 - 10:00 700 MW

23-06-2025 10:00 - 11:00 700 MW

23-06-2025 11:00 - 12:00 700 MW

23-06-2025 12:00 - 13:00 700 MW

23-06-2025 13:00 - 14:00 700 MW

23-06-2025 14:00 - 15:00 700 MW

5. Amount of LTTR remaining after curtailment:

23-06-2025 06:00 - 07:00 337 MW

23-06-2025 07:00 - 08:00 337 MW

23-06-2025 08:00 - 09:00 337 MW

23-06-2025 09:00 - 10:00 337 MW

23-06-2025 10:00 - 11:00 337 MW

23-06-2025 11:00 - 12:00 337 MW

23-06-2025 12:00 - 13:00 337 MW

23-06-2025 13:00 - 14:00 337 MW

23-06-2025 14:00 - 15:00 337 MW

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

For 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.

Resource Center

This section contains key information for market participants such as user guides, forms, auction rules, nomination deadlines and other documents.

Go to resources

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.

Go to registration