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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

Updated Go-Live - eCAT New Trader UI

by JAO

Dear Market Participant,

We would like to inform you that the Go-Live date for the New Trader UI Project has been updated.

The new Go-Live is now scheduled for mid-September.

The exact date will be communicated to you in the coming weeks.

The new interface incorporates several improvements and features, including:

The ability to submit bids in CIM format  (to be able to access this feature you would need to open a ticket to JAO helpdesk for us to amend your user) and view real-time potential liabilities.

Enhanced user experience with a light/dark theme switch, multi-file uploads, and advanced filtering options (such as keyword search and formula-based filtering like "contains," "equals," or "starts with").

Improved table usability, allowing users to reorder, pin, show/hide columns, enlarge or minimize panes, open the bottom pane in full screen, and export data to Excel or CSV formats.

We have taken all feedback received during previous testing rounds into careful consideration and have addressed all reported issues in this final release.

Should you have any questions or require support during the transition, please do not hesitate to reach out to us via email at helpdesk@jao.eu

Kind regards,

JAO Operations

Publication of the merged "Shadow Allocation Rules"

by JAO

Dear Market Participants,

Kindly be informed that, following the approval by the Transmission System Operators (TSOs) and the relevant National Regulatory Authorities (NRAs), the new document for “Shadow Allocation Rules” has been published on our website, following the merger of the “Regional Shadow Allocation Rules” and “Shadow Allocation Rules”.

Please note that the outcome of this merger will also apply to the Core Fallback Methodology.

The merged “Shadow Allocation Rules” will enter into force on 4 September 2025, replacing the previously applicable documents.

Should you have any questions or require further information, please do not hesitate to contact us!

Best regards,
Operations Team
on behalf of the TSOs

Capacity Curtailment on the HU-AT border for delivery period 06-08-2025

by JAO

1. TSO(s)*:

APG

2. Identification of affected Long Term Transmission Rights:

HU-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

06-08-2025 12:00 - 13:00 249 MW

06-08-2025 13:00 - 14:00 249 MW

06-08-2025 14:00 - 15:00 249 MW

06-08-2025 15:00 - 16:00 249 MW

5. Amount of LTTR remaining after curtailment:

06-08-2025 12:00 - 13:00 226 MW

06-08-2025 13:00 - 14:00 155 MW

06-08-2025 14:00 - 15:00 171 MW

06-08-2025 15:00 - 16:00 155 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.

Capacity Curtailment on the SI-AT border for delivery period 06-08-2025

by JAO

1. TSO(s)*:

APG

2. Identification of affected Long Term Transmission Rights:

SI-AT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

06-08-2025 12:00 - 13:00 299 MW

06-08-2025 13:00 - 14:00 299 MW

06-08-2025 14:00 - 15:00 299 MW

06-08-2025 15:00 - 16:00 299 MW

5. Amount of LTTR remaining after curtailment:

06-08-2025 12:00 - 13:00 97 MW

06-08-2025 13:00 - 14:00 56 MW

06-08-2025 14:00 - 15:00 64 MW

06-08-2025 15:00 - 16:00 56 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.

Capacity Curtailment on the AT-CZ border for delivery period 06-08-2025

by JAO

1. TSO(s)*:

APG

2. Identification of affected Long Term Transmission Rights:

AT-CZ

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

06-08-2025 12:00 - 13:00 350 MW

06-08-2025 13:00 - 14:00 350 MW

06-08-2025 14:00 - 15:00 350 MW

06-08-2025 15:00 - 16:00 350 MW

5. Amount of LTTR remaining after curtailment:

06-08-2025 12:00 - 13:00 94 MW

06-08-2025 13:00 - 14:00 110 MW

06-08-2025 14:00 - 15:00 109 MW

06-08-2025 15:00 - 16:00 109 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 AT-DE border for delivery period 06-08-2025

by JAO

1. TSO(s)*:

APG

2. Identification of affected Long Term Transmission Rights:

AT-DE

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

05-08-2025 12:00 - 13:00 3537 MW

05-08-2025 13:00 - 14:00 3537 MW

05-08-2025 14:00 - 15:00 3537 MW

05-08-2025 15:00 - 16:00 3537 MW

5. Amount of LTTR remaining after curtailment:

05-08-2025 12:00 - 13:00 1214 MW

05-08-2025 13:00 - 14:00 1103 MW

05-08-2025 14:00 - 15:00 1105 MW

05-08-2025 15:00 - 16:00 1107 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 IT-GR border for delivery period 06-08-2025

by JAO

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:

06-08-2025 00:00 - 01:00 499 MW

06-08-2025 01:00 - 02:00 499 MW

06-08-2025 02:00 - 03:00 499 MW

06-08-2025 03:00 - 04:00 499 MW

06-08-2025 04:00 - 05:00 499 MW

06-08-2025 05:00 - 06:00 499 MW

06-08-2025 06:00 - 07:00 499 MW

06-08-2025 07:00 - 08:00 499 MW

06-08-2025 08:00 - 09:00 499 MW

06-08-2025 09:00 - 10:00 499 MW

06-08-2025 10:00 - 11:00 499 MW

06-08-2025 11:00 - 12:00 499 MW

06-08-2025 12:00 - 13:00 499 MW

06-08-2025 13:00 - 14:00 499 MW

06-08-2025 14:00 - 15:00 499 MW

06-08-2025 15:00 - 16:00 499 MW

06-08-2025 16:00 - 17:00 499 MW

06-08-2025 17:00 - 18:00 499 MW

06-08-2025 18:00 - 19:00 499 MW

06-08-2025 19:00 - 20:00 499 MW

06-08-2025 20:00 - 21:00 499 MW

06-08-2025 21:00 - 22:00 499 MW

06-08-2025 22:00 - 23:00 499 MW

06-08-2025 23:00 - 24:00 499 MW

5. Amount of LTTR remaining after curtailment:

06-08-2025 00:00 - 01:00 0 MW

06-08-2025 01:00 - 02:00 0 MW

06-08-2025 02:00 - 03:00 0 MW

06-08-2025 03:00 - 04:00 0 MW

06-08-2025 04:00 - 05:00 0 MW

06-08-2025 05:00 - 06:00 0 MW

06-08-2025 06:00 - 07:00 0 MW

06-08-2025 07:00 - 08:00 0 MW

06-08-2025 08:00 - 09:00 0 MW

06-08-2025 09:00 - 10:00 0 MW

06-08-2025 10:00 - 11:00 0 MW

06-08-2025 11:00 - 12:00 0 MW

06-08-2025 12:00 - 13:00 0 MW

06-08-2025 13:00 - 14:00 0 MW

06-08-2025 14:00 - 15:00 0 MW

06-08-2025 15:00 - 16:00 0 MW

06-08-2025 16:00 - 17:00 0 MW

06-08-2025 17:00 - 18:00 0 MW

06-08-2025 18:00 - 19:00 0 MW

06-08-2025 19:00 - 20:00 0 MW

06-08-2025 20:00 - 21:00 0 MW

06-08-2025 21:00 - 22:00 0 MW

06-08-2025 22:00 - 23:00 0 MW

06-08-2025 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

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

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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JAO workers

Frequently asked questions

Check out the common questions and our answers on how to use the auction platform.

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