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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.

 

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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
OPS
  • 500+
    Registered market participants
  • 26k+
    Auctions held annually
  • 100%
    Auction tool availability
  • 80+
    Employees
  • 50
    TSOs serviced

Latest market messages

Capacity Curtailment on the SI-IT border for delivery period 16-01-2026

by JAO

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:

16-01-2026 23:00 - 24:00 310 MW

5. Amount of LTTR remaining after curtailment:

16-01-2026 23:00 - 24:00 284 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

Capacity Curtailment on the AT-IT border for delivery period 16-01-2026

by JAO

1. TSO(s)*:

TERNA (GRTN)

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:

16-01-2026 03:00 - 04:00 224 MW

16-01-2026 04:00 - 05:00 224 MW

16-01-2026 05:00 - 06:00 224 MW

16-01-2026 06:00 - 07:00 224 MW

16-01-2026 12:00 - 13:00 224 MW

16-01-2026 13:00 - 14:00 224 MW

16-01-2026 14:00 - 15:00 224 MW

16-01-2026 21:00 - 22:00 224 MW

16-01-2026 22:00 - 23:00 224 MW

16-01-2026 23:00 - 24:00 224 MW

5. Amount of LTTR remaining after curtailment:

16-01-2026 03:00 - 04:00 172 MW

16-01-2026 04:00 - 05:00 172 MW

16-01-2026 05:00 - 06:00 172 MW

16-01-2026 06:00 - 07:00 172 MW

16-01-2026 12:00 - 13:00 195 MW

16-01-2026 13:00 - 14:00 195 MW

16-01-2026 14:00 - 15:00 195 MW

16-01-2026 21:00 - 22:00 173 MW

16-01-2026 22:00 - 23:00 173 MW

16-01-2026 23:00 - 24:00 158 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

Capacity Curtailment on the ES-FR border for delivery period 16-01-2026

by JAO

1. TSO(s)*:

RTE, REE

2. Identification of affected Long Term Transmission Rights:

ES-FR

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

16-01-2026 18:00 - 19:00 2000 MW

16-01-2026 19:00 - 20:00 2000 MW

16-01-2026 20:00 - 21:00 2000 MW

16-01-2026 21:00 - 22:00 2000 MW

5. Amount of LTTR remaining after curtailment:

16-01-2026 18:00 - 19:00 1829 MW

16-01-2026 19:00 - 20:00 1829 MW

16-01-2026 20:00 - 21:00 1639 MW

16-01-2026 21:00 - 22:00 1722 MW

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

   16/01/2026       18:00-19:00 Network Security       19:00-20:00 Network Security       20:00-21:00 Network Security       21:00-22:00 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

Application of Cap for Capacity Curtailment on GR<>IT for November 2025 invoice

by JAO

We would like to inform you that, in accordance with HAR Long Term Allocation Rules, Article 59, we have applied a Cap for Compensation of Capacity Curtailment for the border GR<>IT. This adjustment will be reflected in the correction for November 2025 invoice.

For your reference, please find the attached calculation.

2026 Auction Calendar update

by JAO

We would like to inform you that as per TSOs request, the 2026 Auction Calendar has been updated on the corridor IF1-FR-GB and IF1-GB-FR.

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

Capacity Curtailment on the D2-DE border for delivery period 14-01-2026

by JAO

1. TSO(s)*:

50Hertz

2. Identification of affected Long Term Transmission Rights:

D2-DE

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

14-01-2026 09:00 - 10:00 250 MW

14-01-2026 10:00 - 11:00 250 MW

14-01-2026 11:00 - 12:00 250 MW

14-01-2026 12:00 - 13:00 250 MW

14-01-2026 13:00 - 14:00 250 MW

14-01-2026 14:00 - 15:00 250 MW

14-01-2026 15:00 - 16:00 250 MW

5. Amount of LTTR remaining after curtailment:

14-01-2026 09:00 - 10:00 9 MW

14-01-2026 10:00 - 11:00 9 MW

14-01-2026 11:00 - 12:00 9 MW

14-01-2026 12:00 - 13:00 9 MW

14-01-2026 13:00 - 14:00 9 MW

14-01-2026 14:00 - 15:00 9 MW

14-01-2026 15:00 - 16:00 9 MW

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

Adjusted because of expected violation of operational security.

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

Adjusted because already considered remedial actions are assessed as not sufficient.

Capacity Curtailment on the AT-IT border for delivery period 14-01-2026

by JAO

1. TSO(s)*:

TERNA, APG

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:

14-01-2026 07:00 - 08:00 224 MW

14-01-2026 08:00 - 09:00 224 MW

14-01-2026 09:00 - 10:00 224 MW

14-01-2026 10:00 - 11:00 224 MW

14-01-2026 11:00 - 12:00 224 MW

14-01-2026 12:00 - 13:00 224 MW

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

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

14-01-2026 15:00 - 16:00 224 MW

14-01-2026 16:00 - 17:00 224 MW

14-01-2026 17:00 - 18:00 224 MW

5. Amount of LTTR remaining after curtailment:

14-01-2026 07:00 - 08:00 173 MW

14-01-2026 08:00 - 09:00 173 MW

14-01-2026 09:00 - 10:00 172 MW

14-01-2026 10:00 - 11:00 172 MW

14-01-2026 11:00 - 12:00 172 MW

14-01-2026 12:00 - 13:00 178 MW

14-01-2026 13:00 - 14:00 178 MW

14-01-2026 14:00 - 15:00 178 MW

14-01-2026 15:00 - 16:00 154 MW

14-01-2026 16:00 - 17:00 154 MW

14-01-2026 17:00 - 18:00 154 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

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. 

ISO
IT

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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