Annual Report 2025 Cover Image
See Our

Annual Report

Read here

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

Go to Message Board
Go to Message board

Capacity Curtailment on the IT-ME border for delivery period 28-09-2026

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:

28-09-2026 18:00 - 19:00 400 MW

28-09-2026 19:00 - 20:00 400 MW

28-09-2026 20:00 - 21:00 400 MW

28-09-2026 21:00 - 22:00 400 MW

5. Amount of LTTR remaining after curtailment:

28-09-2026 18:00 - 19:00 0 MW

28-09-2026 19:00 - 20:00 0 MW

28-09-2026 20:00 - 21:00 0 MW

28-09-2026 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:

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

Capacity Curtailment on the CH-IT border for delivery period 27-09-2026

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:

27-09-2026 12:00 - 13:00 285 MW

27-09-2026 13:00 - 14:00 285 MW

27-09-2026 14:00 - 15:00 285 MW

5. Amount of LTTR remaining after curtailment:

27-09-2026 12:00 - 13:00 0 MW

27-09-2026 13:00 - 14:00 0 MW

27-09-2026 14:00 - 15:00 0 MW

Capacity Curtailment on the FR-IT border for delivery period 27-09-2026

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:

27-09-2026 12:00 - 13:00 457 MW

27-09-2026 13:00 - 14:00 457 MW

27-09-2026 14:00 - 15:00 457 MW

5. Amount of LTTR remaining after curtailment:

27-09-2026 12:00 - 13:00 0 MW

27-09-2026 13:00 - 14:00 0 MW

27-09-2026 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 in the calculation
 

Capacity Curtailment on the GR-IT border for delivery period 27-09-2026

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:

27-09-2026 09:00 - 10:00 500 MW

27-09-2026 10:00 - 11:00 500 MW

27-09-2026 11:00 - 12:00 500 MW

27-09-2026 12:00 - 13:00 500 MW

27-09-2026 13:00 - 14:00 500 MW

27-09-2026 14:00 - 15:00 500 MW

27-09-2026 15:00 - 16:00 500 MW

27-09-2026 16:00 - 17:00 500 MW

5. Amount of LTTR remaining after curtailment:

27-09-2026 09:00 - 10:00 0 MW

27-09-2026 10:00 - 11:00 0 MW

27-09-2026 11:00 - 12:00 0 MW

27-09-2026 12:00 - 13:00 0 MW

27-09-2026 13:00 - 14:00 0 MW

27-09-2026 14:00 - 15:00 0 MW

27-09-2026 15:00 - 16:00 0 MW

27-09-2026 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:
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-IT border for delivery period 27-09-2026

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:

27-09-2026 12:00 - 13:00 59 MW

27-09-2026 13:00 - 14:00 59 MW

27-09-2026 14:00 - 15:00 59 MW

27-09-2026 15:00 - 16:00 59 MW

5. Amount of LTTR remaining after curtailment:

27-09-2026 12:00 - 13:00 0 MW

27-09-2026 13:00 - 14:00 0 MW

27-09-2026 14:00 - 15:00 0 MW

27-09-2026 15:00 - 16:00 42 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-IT border for delivery period 27-09-2026

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:

27-09-2026 12:00 - 13:00 70 MW

27-09-2026 13:00 - 14:00 70 MW

27-09-2026 14:00 - 15:00 70 MW

5. Amount of LTTR remaining after curtailment:

27-09-2026 12:00 - 13:00 55 MW

27-09-2026 13:00 - 14:00 55 MW

27-09-2026 14:00 - 15:00 55 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 ME-IT border for delivery period 27-09-2026

by JAO

1. TSO(s)*:

TERNA

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:

27-09-2026 09:00 - 10:00 400 MW

27-09-2026 10:00 - 11:00 400 MW

27-09-2026 11:00 - 12:00 400 MW

27-09-2026 12:00 - 13:00 400 MW

27-09-2026 13:00 - 14:00 400 MW

27-09-2026 14:00 - 15:00 400 MW

27-09-2026 15:00 - 16:00 400 MW

27-09-2026 16:00 - 17:00 400 MW

5. Amount of LTTR remaining after curtailment:

27-09-2026 09:00 - 10:00 0 MW

27-09-2026 10:00 - 11:00 0 MW

27-09-2026 11:00 - 12:00 0 MW

27-09-2026 12:00 - 13:00 0 MW

27-09-2026 13:00 - 14:00 0 MW

27-09-2026 14:00 - 15:00 0 MW

27-09-2026 15:00 - 16:00 0 MW

27-09-2026 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 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

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.

Go to registration
JAO workers

Frequently asked questions

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

Go to FAQ

Do you need support?

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

Go to service desk