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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

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 and IF2.

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 CH-IT border for delivery period 19-02-2026

by JAO

1. TSO(s)*:

Terna

2. Identification of affected Long Term Transmission Rights:

CH-IT

3, Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

4. Affected volume in MW / period:

19-02-2026 12:00 - 13:00 2486 MW

19-02-2026 13:00 - 14:00 2486 MW

19-02-2026 14:00 - 15:00 2486 MW

19-02-2026 12:00 - 13:00 2486 MW

19-02-2026 13:00 - 14:00 2486 MW

19-02-2026 14:00 - 15:00 2486 MW

5. Amount of LTTR remaining after curtailment:

19-02-2026 12:00 - 13:00 2375 MW

19-02-2026 13:00 - 14:00 2375 MW

19-02-2026 14:00 - 15:00 2375 MW

19-02-2026 12:00 - 13:00 2375 MW

19-02-2026 13:00 - 14:00 2375 MW

19-02-2026 14:00 - 15:00 2375 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 GR-IT border for delivery period 19-02-2026

by JAO

1. TSO(s)*:

TERNA

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 / period:

19-02-2026 09:00 - 10:00 500 MW

19-02-2026 10:00 - 11:00 500 MW

19-02-2026 11:00 - 12:00 500 MW

19-02-2026 12:00 - 13:00 500 MW

19-02-2026 13:00 - 14:00 500 MW

19-02-2026 14:00 - 15:00 500 MW

5. Amount of LTTR remaining after curtailment:

19-02-2026 09:00 - 10:00 0 MW

19-02-2026 10:00 - 11:00 0 MW

19-02-2026 11:00 - 12:00 0 MW

19-02-2026 12:00 - 13:00 0 MW

19-02-2026 13:00 - 14:00 0 MW

19-02-2026 14:00 - 15:00 0 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

Follow-up on public consultation of Swiss DA rules – Updated block bids documentation

by JAO

After receiving further feedback regarding the integration of block bids, we would like to provide the following clarifications in the attached documents:

  • JAO_Blockbids_Benders Explained pdf: This is the updated “Benders Decomposition Design” document which includes final Business Rules and Tie-Breaking rules decided by the TSOs and provides clear results for the Examples 1,4,6 and 6bis
  • Block bids – additional explanation pdf: This document includes further explanation regarding the Example 5, as well as additional information on system stability

We trust that the above clarifications are helpful.

JAO, on behalf of the TSOs

Capacity Curtailment on the IT-ME border for delivery period 19-02-2026

by JAO

1. TSO(s)*:

CGES

2. Identification of affected Long Term Transmission Rights:

IT-ME

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

19-02-2026 07:00 - 08:00 400 MW

19-02-2026 08:00 - 09:00 400 MW

19-02-2026 09:00 - 10:00 400 MW

19-02-2026 10:00 - 11:00 400 MW

19-02-2026 11:00 - 12:00 400 MW

19-02-2026 12:00 - 13:00 400 MW

19-02-2026 13:00 - 14:00 400 MW

19-02-2026 14:00 - 15:00 400 MW

19-02-2026 15:00 - 16:00 400 MW

19-02-2026 16:00 - 17:00 400 MW

5. Amount of LTTR remaining after curtailment:

19-02-2026 07:00 - 08:00 0 MW

19-02-2026 08:00 - 09:00 0 MW

19-02-2026 09:00 - 10:00 0 MW

19-02-2026 10:00 - 11:00 0 MW

19-02-2026 11:00 - 12:00 0 MW

19-02-2026 12:00 - 13:00 0 MW

19-02-2026 13:00 - 14:00 0 MW

19-02-2026 14:00 - 15:00 0 MW

19-02-2026 15:00 - 16:00 0 MW

19-02-2026 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

*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 ME-IT border for delivery period 19-02-2026

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:

19-02-2026 07:00 - 08:00 399 MW

19-02-2026 08:00 - 09:00 399 MW

19-02-2026 09:00 - 10:00 399 MW

19-02-2026 10:00 - 11:00 399 MW

19-02-2026 11:00 - 12:00 399 MW

19-02-2026 12:00 - 13:00 399 MW

19-02-2026 13:00 - 14:00 399 MW

19-02-2026 14:00 - 15:00 399 MW

19-02-2026 15:00 - 16:00 399 MW

19-02-2026 16:00 - 17:00 399 MW

5. Amount of LTTR remaining after curtailment:

19-02-2026 07:00 - 08:00 0 MW

19-02-2026 08:00 - 09:00 0 MW

19-02-2026 09:00 - 10:00 0 MW

19-02-2026 10:00 - 11:00 0 MW

19-02-2026 11:00 - 12:00 0 MW

19-02-2026 12:00 - 13:00 0 MW

19-02-2026 13:00 - 14:00 0 MW

19-02-2026 14:00 - 15:00 0 MW

19-02-2026 15:00 - 16:00 0 MW

19-02-2026 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

*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 GR-IT border for delivery period 18-02-2026

by JAO

1. TSO(s)*:

TERNA

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:

18-02-2026 10:00 - 11:00 500 MW

18-02-2026 11:00 - 12:00 500 MW

18-02-2026 12:00 - 13:00 500 MW

18-02-2026 13:00 - 14:00 500 MW

18-02-2026 14:00 - 15:00 500 MW

5. Amount of LTTR remaining after curtailment:

18-02-2026 10:00 - 11:00 0 MW

18-02-2026 11:00 - 12:00 0 MW

18-02-2026 12:00 - 13:00 0 MW

18-02-2026 13:00 - 14:00 0 MW

18-02-2026 14:00 - 15:00 0 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

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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