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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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Public consultation opening - Allocation Rules for Serbia-Montenegro border

Published: 08/10/2025 | 16:24 by JAO
Capacity Curtailment on the IT-FR border for delivery period 09-10-2025

Published: 08/10/2025 | 08:20 by JAO
Capacity Curtailment on the GR-IT border for delivery period 09-10-2025

Published: 08/10/2025 | 08:18 by JAO
Capacity Curtailment on the IT-GR border for delivery period 09-10-2025

Published: 08/10/2025 | 08:18 by JAO
Capacity Curtailment on the EL1-GB-FR border for delivery period 10-10-2025

Published: 08/10/2025 | 08:16 by JAO
Capacity Curtailment on the EL1-FR-GB border for delivery period 10-10-2025

Published: 08/10/2025 | 08:12 by JAO
Capacity Curtailment on the FR-ES border for delivery period 09-10-2025

Published: 07/10/2025 | 22:48 by JAO

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On behalf of the relevant TSOs, and in anticipation of the upcoming go-live of the daily and long-term auctions for the Serbia-Montenegro (RS-ME) border, JAO is launching the public consultation on the following documents:

The consultation period runs from 8th October to 7th November 2025.

All interested parties are invited to submit their comments via e-mail no later than07/11/2025 17:00 CETto the following e-mail address:consultation@jao.eu.

Following the consultation, TSOs will evaluate Market Participants’ comments and submit the auction rules and the border specific annex to the responsible NRAs.

We remain at your disposal in case of any question.

JAO Operations Team

1. TSO(s)*:

TERNA, RTE

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:

09-10-2025 13:00 - 14:00 1493 MW

09-10-2025 14:00 - 15:00 1493 MW

09-10-2025 15:00 - 16:00 1493 MW

09-10-2025 16:00 - 17:00 1493 MW

09-10-2025 17:00 - 18:00 1493 MW

5. Amount of LTTR remaining after curtailment:

09-10-2025 13:00 - 14:00 968 MW

09-10-2025 14:00 - 15:00 968 MW

09-10-2025 15:00 - 16:00 968 MW

09-10-2025 16:00 - 17:00 968 MW

09-10-2025 17:00 - 18:00 968 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

*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, ADMIE

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:

09-10-2025 00:00 - 01:00 50 MW

09-10-2025 01:00 - 02:00 50 MW

09-10-2025 02:00 - 03:00 50 MW

09-10-2025 03:00 - 04:00 50 MW

09-10-2025 04:00 - 05:00 50 MW

09-10-2025 05:00 - 06:00 50 MW

09-10-2025 06:00 - 07:00 50 MW

09-10-2025 07:00 - 08:00 50 MW

09-10-2025 08:00 - 09:00 50 MW

09-10-2025 09:00 - 10:00 50 MW

09-10-2025 10:00 - 11:00 50 MW

09-10-2025 11:00 - 12:00 50 MW

09-10-2025 12:00 - 13:00 50 MW

09-10-2025 13:00 - 14:00 50 MW

09-10-2025 14:00 - 15:00 50 MW

09-10-2025 15:00 - 16:00 50 MW

09-10-2025 16:00 - 17:00 50 MW

09-10-2025 17:00 - 18:00 50 MW

09-10-2025 18:00 - 19:00 50 MW

09-10-2025 19:00 - 20:00 50 MW

09-10-2025 20:00 - 21:00 50 MW

09-10-2025 21:00 - 22:00 50 MW

09-10-2025 22:00 - 23:00 50 MW

09-10-2025 23:00 - 24:00 50 MW

5. Amount of LTTR remaining after curtailment:

09-10-2025 00:00 - 01:00 0 MW

09-10-2025 01:00 - 02:00 0 MW

09-10-2025 02:00 - 03:00 0 MW

09-10-2025 03:00 - 04:00 0 MW

09-10-2025 04:00 - 05:00 0 MW

09-10-2025 05:00 - 06:00 0 MW

09-10-2025 06:00 - 07:00 0 MW

09-10-2025 07:00 - 08:00 0 MW

09-10-2025 08:00 - 09:00 0 MW

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

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

09-10-2025 11:00 - 12:00 0 MW

09-10-2025 12:00 - 13:00 0 MW

09-10-2025 13:00 - 14:00 0 MW

09-10-2025 14:00 - 15:00 0 MW

09-10-2025 15:00 - 16:00 0 MW

09-10-2025 16:00 - 17:00 0 MW

09-10-2025 17:00 - 18:00 0 MW

09-10-2025 18:00 - 19:00 0 MW

09-10-2025 19:00 - 20:00 0 MW

09-10-2025 20:00 - 21:00 0 MW

09-10-2025 21:00 - 22:00 0 MW

09-10-2025 22:00 - 23:00 0 MW

09-10-2025 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*:
HVDC cable ARACTHOS – GALATINA

*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, ADMIE

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:

09-10-2025 00:00 - 01:00 50 MW

09-10-2025 01:00 - 02:00 50 MW

09-10-2025 02:00 - 03:00 50 MW

09-10-2025 03:00 - 04:00 50 MW

09-10-2025 04:00 - 05:00 50 MW

09-10-2025 05:00 - 06:00 50 MW

09-10-2025 06:00 - 07:00 50 MW

09-10-2025 07:00 - 08:00 50 MW

09-10-2025 08:00 - 09:00 50 MW

09-10-2025 09:00 - 10:00 50 MW

09-10-2025 10:00 - 11:00 50 MW

09-10-2025 11:00 - 12:00 50 MW

09-10-2025 12:00 - 13:00 50 MW

09-10-2025 13:00 - 14:00 50 MW

09-10-2025 14:00 - 15:00 50 MW

09-10-2025 15:00 - 16:00 50 MW

09-10-2025 16:00 - 17:00 50 MW

09-10-2025 17:00 - 18:00 50 MW

09-10-2025 18:00 - 19:00 50 MW

09-10-2025 19:00 - 20:00 50 MW

09-10-2025 20:00 - 21:00 50 MW

09-10-2025 21:00 - 22:00 50 MW

09-10-2025 22:00 - 23:00 50 MW

09-10-2025 23:00 - 24:00 50 MW

5. Amount of LTTR remaining after curtailment:

09-10-2025 00:00 - 01:00 0 MW

09-10-2025 01:00 - 02:00 0 MW

09-10-2025 02:00 - 03:00 0 MW

09-10-2025 03:00 - 04:00 0 MW

09-10-2025 04:00 - 05:00 0 MW

09-10-2025 05:00 - 06:00 0 MW

09-10-2025 06:00 - 07:00 0 MW

09-10-2025 07:00 - 08:00 0 MW

09-10-2025 08:00 - 09:00 0 MW

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

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

09-10-2025 11:00 - 12:00 0 MW

09-10-2025 12:00 - 13:00 0 MW

09-10-2025 13:00 - 14:00 0 MW

09-10-2025 14:00 - 15:00 0 MW

09-10-2025 15:00 - 16:00 0 MW

09-10-2025 16:00 - 17:00 0 MW

09-10-2025 17:00 - 18:00 0 MW

09-10-2025 18:00 - 19:00 0 MW

09-10-2025 19:00 - 20:00 0 MW

09-10-2025 20:00 - 21:00 0 MW

09-10-2025 21:00 - 22:00 0 MW

09-10-2025 22:00 - 23:00 0 MW

09-10-2025 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*:
HVDC cable ARACTHOS – GALATINA

*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)*:

ELECLINK

2. Identification of affected Long Term Transmission Rights:

EL1-GB-FR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

10-10-2025 19:00 - 20:00 938 MW

10-10-2025 20:00 - 21:00 938 MW

10-10-2025 21:00 - 22:00 938 MW

10-10-2025 22:00 - 23:00 938 MW

10-10-2025 23:00 - 24:00 938 MW

5. Amount of LTTR remaining after curtailment:

10-10-2025 19:00 - 20:00 0 MW

10-10-2025 20:00 - 21:00 0 MW

10-10-2025 21:00 - 22:00 0 MW

10-10-2025 22:00 - 23:00 0 MW

10-10-2025 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*:

Planned Outage

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

Maintenance for a Planned outage

*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)*:

ELECLINK

2. Identification of affected Long Term Transmission Rights:

EL1-FR-GB

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

10-10-2025 19:00 - 20:00 939 MW

10-10-2025 20:00 - 21:00 939 MW

10-10-2025 21:00 - 22:00 939 MW

10-10-2025 22:00 - 23:00 939 MW

10-10-2025 23:00 - 24:00 939 MW

5. Amount of LTTR remaining after curtailment:

10-10-2025 19:00 - 20:00 0 MW

10-10-2025 20:00 - 21:00 0 MW

10-10-2025 21:00 - 22:00 0 MW

10-10-2025 22:00 - 23:00 0 MW

10-10-2025 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*:

Planned Outage

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

Maintenance for a Planned outage

*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, REE

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:

09-10-2025 00:00 - 01:00 1750 MW

09-10-2025 01:00 - 02:00 1750 MW

09-10-2025 02:00 - 03:00 1750 MW

09-10-2025 03:00 - 04:00 1750 MW

09-10-2025 04:00 - 05:00 1750 MW

09-10-2025 05:00 - 06:00 1750 MW

5. Amount of LTTR remaining after curtailment:

09-10-2025 00:00 - 01:00 1221 MW

09-10-2025 01:00 - 02:00 1221 MW

09-10-2025 02:00 - 03:00 1221 MW

09-10-2025 03:00 - 04:00 1221 MW

09-10-2025 04:00 - 05:00 1315 MW

09-10-2025 05:00 - 06:00 1315 MW

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

09/10/2025

00:00-01:00 Network Security

01:00-02:00 Network Security

02:00-03:00 Network Security

03:00-04:00 Network Security

04:00-05:00 Network Security

05:00-06:00 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

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.

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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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