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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 ME-IT border for delivery period 04-10-2026

by JAO

1. TSO(s)*:

CGES

2. Identification of affected Long Term Transmission Rights:

ME-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

04-10-2026 09:00 - 10:00 400 MW

04-10-2026 10:00 - 11:00 400 MW

04-10-2026 11:00 - 12:00 400 MW

04-10-2026 12:00 - 13:00 400 MW

04-10-2026 13:00 - 14:00 400 MW

04-10-2026 14:00 - 15:00 400 MW

04-10-2026 15:00 - 16:00 400 MW

04-10-2026 16:00 - 17:00 400 MW

5. Amount of LTTR remaining after curtailment:

04-10-2026 09:00 - 10:00 0 MW

04-10-2026 10:00 - 11:00 0 MW

04-10-2026 11:00 - 12:00 0 MW

04-10-2026 12:00 - 13:00 0 MW

04-10-2026 13:00 - 14:00 0 MW

04-10-2026 14:00 - 15:00 0 MW

04-10-2026 15:00 - 16:00 0 MW

04-10-2026 16:00 - 17:00 0 MW

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

HVDC Monita

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

SDAC_JAO_01: SDAC market coupling 30/09 - Session complete

by JAO

Please be informed that the day-ahead market coupling session is now completed

[SDAC_ExC_02a]: Delay in Preliminary Market Coupling Results publication

by JAO

Please be aware that the publication of the preliminary SDAC Market Coupling Results is delayed until further notice.

The Market Coupling Results will be published as soon as they are available.

If needed, another delay message will be sent out.

Further information can be found in the Fallback Manual that is published on the websites of NEMO Committee and ENTSO-E.


Therefore, if relevant, we advise you to update your shadow bids at JAO eCAT platform before 14:10.

Release Note | Publication Tool (PuTO) | Release 1.6.0

by JAO

This release includes the following updates:

Improvements:

Italy North Monitoring is live

What changed:

We’ve added a dedicated monitoring filter for Italy North.

Impact:

Now you can track your data flows with precision and stay accountable without the guesswork.

Action required:

No action required.

Smart API Filtering for CNEC

What changed:

You can now filter the D-2 CNEC Information endpoint by "limiting" elements (true/false).

Impact:

It’s a small change that makes a big difference in reducing payload sizes and keeping your queries snappy.

Action required:

No action required.

API Speed Limits

What changed:

We are introducing a sensible cap on the "Take" parameter for API requests. "Take” will be limited to 100.000 starting from 15th of October.

Impact:

No more accidental million-row queries slowing down the database for everyone. Just fast and efficient data retrieval.

Action required:

You can find our best Practice Guide here to prepare to this change: Publication tool | JAO S.A. Leading service provider for TSOs (https://www.jao.eu/page-api/publication-tool)

Better Data Mapping

What changed:

We’ve mapped three additional columns (F_ref, F0core, and R_amr%) across the Final Domain Merging, Domain Splitting, and Final FB Computation pages.

Impact:

To give you the full picture.

Action required:

No action required.

Streamlined Filters

What changed:

The timestamp filter on the Border Data Overview page has been disabled where it wasn't adding value.

Impact:

Keeping your workspace clutter-free.

Action required:

No action required.

MarketGraph Insights

What changed:

We’ve investigated and fixed the Core MarketGraphs.

Impact:

To ensure data from LT-147 and LT-148 flows is actually visible when you need it.

Action required:

No action required.

Bug Fixes (if any):

The "Version 0" Logic

What was fixed:

We fixed a bug where initial "Forecasted" files (version 0) were failing if no prior version existed. Now, the system is smart enough to know that everyone has to start somewhere.

ZIP Processing Reliability

What was fixed:

Resolved an issue where the Core file processor would skip valid files inside F413 ZIP packages due to versioning confusion. Your files should now process fully and correctly.

Intraday Monitoring Sync

What was fixed:

Fixed a bug where intraday monitoring entries would stay "Pending" even after successful publication. The status lights should now accurately reflect reality.

SFTP Ingestion Fix

What was fixed:

We tracked down why some files were getting stuck in the "Success" folder without appearing on the website. Everything is now flowing through to the UI as expected.

For questions or assistance regarding these updates, please contact JAO Support Hub.

Capacity Curtailment on the NSL-GB-N2 border for delivery period 03-10-2026

by JAO

1. TSO(s)*:

National Grid and Stattnet

2. Identification of affected Long Term Transmission Rights:

NSL-GB-N2

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

03-10-2026 19:00 - 20:00 50 MW

03-10-2026 20:00 - 21:00 50 MW

03-10-2026 21:00 - 22:00 50 MW

5. Amount of LTTR remaining after curtailment:

03-10-2026 19:00 - 20:00 38 MW

03-10-2026 20:00 - 21:00 0 MW

03-10-2026 21:00 - 22:00 0 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 SI-AT border for delivery period 03-10-2026

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:

03-10-2026 08:00 - 09:00 400 MW

03-10-2026 09:00 - 10:00 400 MW

03-10-2026 10:00 - 11:00 400 MW

03-10-2026 11:00 - 12:00 400 MW

03-10-2026 12:00 - 13:00 400 MW

03-10-2026 13:00 - 14:00 400 MW

03-10-2026 14:00 - 15:00 400 MW

03-10-2026 15:00 - 16:00 400 MW

5. Amount of LTTR remaining after curtailment:

03-10-2026 08:00 - 09:00 177 MW

03-10-2026 09:00 - 10:00 172 MW

03-10-2026 10:00 - 11:00 192 MW

03-10-2026 11:00 - 12:00 178 MW

03-10-2026 12:00 - 13:00 206 MW

03-10-2026 13:00 - 14:00 196 MW

03-10-2026 14:00 - 15:00 159 MW

03-10-2026 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 HU-AT border for delivery period 03-10-2026

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:

03-10-2026 08:00 - 09:00 320 MW

03-10-2026 09:00 - 10:00 320 MW

03-10-2026 10:00 - 11:00 320 MW

03-10-2026 11:00 - 12:00 320 MW

03-10-2026 12:00 - 13:00 320 MW

03-10-2026 13:00 - 14:00 320 MW

03-10-2026 14:00 - 15:00 320 MW

03-10-2026 15:00 - 16:00 320 MW

5. Amount of LTTR remaining after curtailment:

03-10-2026 08:00 - 09:00 205 MW

03-10-2026 09:00 - 10:00 213 MW

03-10-2026 10:00 - 11:00 228 MW

03-10-2026 11:00 - 12:00 229 MW

03-10-2026 12:00 - 13:00 250 MW

03-10-2026 13:00 - 14:00 232 MW

03-10-2026 14:00 - 15:00 217 MW

03-10-2026 15:00 - 16:00 217 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.

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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Frequently asked questions

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

Do you need support?

If you can't find an answer to your question, our team is here to help!