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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 09-01-2026

Published: 08/01/2026 | 07:49 by JAO
Capacity Curtailment on the SI-IT border for delivery period 09-01-2026

Published: 08/01/2026 | 07:34 by JAO
Capacity Curtailment on the IT-SI border for delivery period 09-01-2026

Published: 08/01/2026 | 07:32 by JAO
Capacity Curtailment on the AT-IT border for delivery period 09-01-2026

Published: 08/01/2026 | 07:31 by JAO
Capacity Curtailment on the IT-AT border for delivery period 09-01-2026

Published: 08/01/2026 | 07:29 by JAO
2026 Auction Calendar update

Published: 07/01/2026 | 17:06 by JAO
Capacity Curtailment on the IT-CH border for delivery period 08-01-2026

Published: 07/01/2026 | 07:38 by JAO

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1. TSO(s)*:

SWISSGRID

2. Identification of affected Long Term Transmission Rights:

CH-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

09-01-2026 08:00 - 09:00 2786 MW

09-01-2026 09:00 - 10:00 2786 MW

09-01-2026 10:00 - 11:00 2786 MW

09-01-2026 11:00 - 12:00 2786 MW

09-01-2026 12:00 - 13:00 2786 MW

09-01-2026 13:00 - 14:00 2786 MW

09-01-2026 14:00 - 15:00 2786 MW

09-01-2026 15:00 - 16:00 2786 MW

09-01-2026 16:00 - 17:00 2786 MW

5. Amount of LTTR remaining after curtailment:

09-01-2026 08:00 - 09:00 2644 MW

09-01-2026 09:00 - 10:00 2143 MW

09-01-2026 10:00 - 11:00 2143 MW

09-01-2026 11:00 - 12:00 2143 MW

09-01-2026 12:00 - 13:00 2218 MW

09-01-2026 13:00 - 14:00 2218 MW

09-01-2026 14:00 - 15:00 2218 MW

09-01-2026 15:00 - 16:00 2423 MW

09-01-2026 16:00 - 17:00 2423 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:

09-01-2026 18:00 - 19:00 310 MW

09-01-2026 19:00 - 20:00 310 MW

09-01-2026 20:00 - 21:00 310 MW

09-01-2026 21:00 - 22:00 310 MW

09-01-2026 22:00 - 23:00 310 MW

09-01-2026 23:00 - 24:00 310 MW

5. Amount of LTTR remaining after curtailment:

09-01-2026 18:00 - 19:00 256 MW

09-01-2026 19:00 - 20:00 256 MW

09-01-2026 20:00 - 21:00 256 MW

09-01-2026 21:00 - 22:00 265 MW

09-01-2026 22:00 - 23:00 265 MW

09-01-2026 23:00 - 24:00 248 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:

09-01-2026 09:00 - 10:00 334 MW

09-01-2026 10:00 - 11:00 334 MW

09-01-2026 11:00 - 12:00 334 MW

09-01-2026 12:00 - 13:00 334 MW

09-01-2026 13:00 - 14:00 334 MW

09-01-2026 14:00 - 15:00 334 MW

5. Amount of LTTR remaining after curtailment:

09-01-2026 09:00 - 10:00 259 MW

09-01-2026 10:00 - 11:00 259 MW

09-01-2026 11:00 - 12:00 259 MW

09-01-2026 12:00 - 13:00 307 MW

09-01-2026 13:00 - 14:00 307 MW

09-01-2026 14:00 - 15:00 307 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:

09-01-2026 09:00 - 10:00 224 MW

09-01-2026 10:00 - 11:00 224 MW

09-01-2026 11:00 - 12:00 224 MW

09-01-2026 12:00 - 13:00 224 MW

09-01-2026 13:00 - 14:00 224 MW

09-01-2026 14:00 - 15:00 224 MW

09-01-2026 18:00 - 19:00 224 MW

09-01-2026 19:00 - 20:00 224 MW

09-01-2026 20:00 - 21:00 224 MW

09-01-2026 21:00 - 22:00 224 MW

09-01-2026 22:00 - 23:00 224 MW

09-01-2026 23:00 - 24:00 224 MW

5. Amount of LTTR remaining after curtailment:

09-01-2026 09:00 - 10:00 155 MW

09-01-2026 10:00 - 11:00 155 MW

09-01-2026 11:00 - 12:00 155 MW

09-01-2026 12:00 - 13:00 152 MW

09-01-2026 13:00 - 14:00 152 MW

09-01-2026 14:00 - 15:00 152 MW

09-01-2026 18:00 - 19:00 147 MW

09-01-2026 19:00 - 20:00 147 MW

09-01-2026 20:00 - 21:00 147 MW

09-01-2026 21:00 - 22:00 152 MW

09-01-2026 22:00 - 23:00 152 MW

09-01-2026 23:00 - 24:00 143 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-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

09-01-2026 09:00 - 10:00 81 MW

09-01-2026 10:00 - 11:00 81 MW

09-01-2026 11:00 - 12:00 81 MW

09-01-2026 12:00 - 13:00 81 MW

09-01-2026 13:00 - 14:00 81 MW

09-01-2026 14:00 - 15:00 81 MW

5. Amount of LTTR remaining after curtailment:

09-01-2026 09:00 - 10:00 50 MW

09-01-2026 10:00 - 11:00 50 MW

09-01-2026 11:00 - 12:00 50 MW

09-01-2026 12:00 - 13:00 60 MW

09-01-2026 13:00 - 14:00 60 MW

09-01-2026 14:00 - 15:00 60 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

We would like to inform you that as per TSOs request, the 2026 Auction Calendar has been updated on the corridors IF1-FR<>GB and IF2-FR<>GB for the Monthly, Quarterly and Yearly horizons.

For more details please refer to the Auction Calendar on our webpage http://www.jao.eu/auctions#/calendar/table to find its latest version.

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

IT-CH

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

08-01-2026 15:00 - 16:00 927 MW

08-01-2026 16:00 - 17:00 927 MW

08-01-2026 17:00 - 18:00 927 MW

08-01-2026 18:00 - 19:00 927 MW

5. Amount of LTTR remaining after curtailment:

08-01-2026 15:00 - 16:00 778 MW

08-01-2026 16:00 - 17:00 778 MW

08-01-2026 17:00 - 18:00 778 MW

08-01-2026 18:00 - 19:00 778 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.

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.

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