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Annual Report

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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.

 

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

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Capacity Curtailment on the CH-IT border for delivery period 26-09-2026

by JAO

1. TSO(s)*:

SWISSGRID

2. Identification of affected Long Term Transmission Rights:

CH-IT

3. Triggering event:

Curtailment due to Curtailment to ensure operation remains within Operational Security Limits

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

26-09-2026 12:00 - 13:00 285 MW

26-09-2026 13:00 - 14:00 285 MW

26-09-2026 14:00 - 15:00 285 MW

5. Amount of LTTR remaining after curtailment:

26-09-2026 12:00 - 13:00 0 MW

26-09-2026 13:00 - 14:00 0 MW

26-09-2026 14:00 - 15:00 0 MW

Capacity Curtailment on the FR-IT border for delivery period 26-09-2026

by JAO

1. TSO(s)*:

TERNA

2. Identification of affected Long Term Transmission Rights:

FR-IT

3. Triggering event:

Curtailment to ensure operation remains within Operational Security Limits

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

26-09-2026 12:00 - 13:00 481 MW

26-09-2026 13:00 - 14:00 481 MW

26-09-2026 14:00 - 15:00 481 MW

5. Amount of LTTR remaining after curtailment:

26-09-2026 12:00 - 13:00 0 MW

26-09-2026 13:00 - 14:00 0 MW

26-09-2026 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

*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-IT border for delivery period 26-09-2026

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:

26-09-2026 12:00 - 13:00 59 MW

26-09-2026 13:00 - 14:00 59 MW

26-09-2026 14:00 - 15:00 59 MW

5. Amount of LTTR remaining after curtailment:

26-09-2026 12:00 - 13:00 0 MW

26-09-2026 13:00 - 14:00 0 MW

26-09-2026 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

*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 26-09-2026

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:

26-09-2026 10:00 - 11:00 500 MW

26-09-2026 11:00 - 12:00 500 MW

26-09-2026 12:00 - 13:00 500 MW

26-09-2026 13:00 - 14:00 500 MW

26-09-2026 14:00 - 15:00 500 MW

26-09-2026 15:00 - 16:00 500 MW

26-09-2026 16:00 - 17:00 500 MW

5. Amount of LTTR remaining after curtailment:

26-09-2026 10:00 - 11:00 0 MW

26-09-2026 11:00 - 12:00 0 MW

26-09-2026 12:00 - 13:00 0 MW

26-09-2026 13:00 - 14:00 0 MW

26-09-2026 14:00 - 15:00 0 MW

26-09-2026 15:00 - 16:00 0 MW

26-09-2026 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 cable ARACTHOS – GALATINA

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

Not applicable

*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 26-09-2026

by JAO

1. TSO(s)*:

TERNA

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:

26-09-2026 12:00 - 13:00 70 MW

26-09-2026 13:00 - 14:00 70 MW

26-09-2026 14:00 - 15:00 70 MW

5. Amount of LTTR remaining after curtailment:

26-09-2026 12:00 - 13:00 59 MW

26-09-2026 13:00 - 14:00 59 MW

26-09-2026 14:00 - 15:00 59 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

*According to section 57.3 of the EU HAR, this field can be filled in within 24 hours after the initial publication

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 NSL.

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

Market Data API Service Maintenance

by JAO

Please be informed that a scheduled maintenance will be performed on the Market Data API, This API is responsible for providing information to the website’s market data.

Maintenance window:
28 September, 22:15 – 29 September, 03:00 CET


During this maintenance window, the Market Data API service will be fully unavailable and unreachable. As a result, market data provided through the API will not be available during this period.

The service is expected to be restored as soon as possible.

We apologise for any inconvenience this may cause and thank you for your understanding.

Resource Center

This section contains key information for market participants such as user guides, forms, auction rules, nomination deadlines and other documents.

Go to resources

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.

Get to know us

Register your company

We created a user guide to support the onboarding of market participants. Learn more about the steps to register, the required documents and our service desk platform.

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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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Do you need support?

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

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