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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 12-02-2026

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:

12-02-2026 09:00 - 10:00 311 MW

12-02-2026 10:00 - 11:00 311 MW

12-02-2026 11:00 - 12:00 311 MW

5. Amount of LTTR remaining after curtailment:

12-02-2026 09:00 - 10:00 283 MW

12-02-2026 10:00 - 11:00 283 MW

12-02-2026 11:00 - 12:00 283 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

 

Action Required: Whitelist JAO Email IP Addresses and Domain

by JAO

Please be informed that that some emails sent from JAO, including accounting and invoice-related communications, may not be reaching recipients.

This issue has been identified as being related to OpenDNS categorising JAO domains as suspicious, which can result in JAO email IP addresses and domains being blocked or filtered by local email service providers.

To ensure uninterrupted receipt of JAO communications, we kindly request that you contact your IT or email service provider and whitelist JAO’s sending IP addresses and domain with immediate effect.

Failure to apply this whitelisting may lead to delays in receiving important communications, including invoices, which could impact timely settlement.

Should you require any technical details to support the whitelisting process, please do not hesitate to contact us.

Thank you for your cooperation and support.

Kind regards,

JAO Operations

SOLVED: Auction Data Currently Unavailable on Website

by JAO

Auction data is now available again on our website.

Thanks for your patience.

Go-live date: change of method to determine the GLSK of the CZ bidding zone

by JAO

Dear Market Participants,

 

As communicated in the previous market message dated 15 January 2026 [Message board | JAO S.A. Leading service provider for TSOs], and in line with Article 24(5) of the Core DA CCM and Article 21(5) of the Core ID CCM, ČEPS would like to provide you with additional information regarding the upcoming change in the method used to determine the GLSK of the CZ bidding zone.

The new method will be applied in both the day-ahead (DA) and intraday (ID) timeframes. The go-live date for DA capacity calculation is planned to be 15 April 2026 for business day 17 April 2026. And subsequently, for the same business day, for the ID capacity calculation

 

Sincerely,
ČEPS

Auction Data Currently Unavailable on Website

by JAO

Please note that, due to a technical issue, auction data is currently not available on our website.

We kindly ask you to consult the auction tool directly for information on auctions that are currently running.

Thank you for your understanding.

Publication of IBWT IDA3 data for Business Day 09/02/2026

by JAO

Please be informed that the IBWT IDA3 data for the business day 09/02/2026, covering the Italy North CCR and the IBWT IDA Publication Tool, will be published with a delay.

Thank you for your understanding.

Kind regards,

JAO Operations

Urgent Market Update: Delay of UA><HU-D-DAILYPRODU-260209-01 for Market Period 09/02/2026

by JAO

Please note that the (UA-HU) Daily auction for market period 09/02/2026 with the auction ID (UA-HU-D-DAILYPRODU-260209-01) has been delayed. Bid submission gate opens at 10:10.

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. 

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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.

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