Leading service provider for Transmission System Operators (TSOs) in the European electricity market.

We would like to inform you about an important update regarding the Daily Auction Schedule Change on the UA–SK border.

Starting from delivery day January 1st 2026, the daily auction timing for the UA–SK border will change from D-2  to D-1.

This change is implemented in line with the modified Rules for Daily Capacity Allocation on Ukrainian Borders and the updated Border Specific Annex (BSA), which will be effective from delivery day 01.01.2026.

The following Schedule is foreseen :

29.12.2025: Daily auction for delivery day 31.12.2025 (under current D-2 process)

30.12.2025: No daily auction on UA–SK border

31.12.2025: Daily auction for delivery day 01.01.2026 (first auction under new D-1 process)

JAO Operations

Dear Market Participants,

Following the approval by the relevant NRAs and further to our previous notification regarding the Serbian borders, the following documents have been updated on our website:

• “HAR 2026 for non-EU borders” and its Border Specific Annexes”for the bidding zone borders:
  • Croatia-Serbia (amendment with effective date 1^stJanuary 2026)

• “Rules for Explicit Daily Capacity Allocation on Bidding Zone border serviced by JAO”with Border Specific Annexes for the bidding zone borders:
  • Croatia-Serbia (amending the previous standalone HR-RS daily allocation rules with effective date 5^th February 2026)

Best regards,

JAO Operations Team

Please note that the second round of the Monthly auctions on the FR<>ES corridor for the January period, with auction IDs FR-ES-M-BASE-------260101-02 and ES-FR-M-BASE-------260101-02, will open for bid submissions today, 22 December, at 13:35 CET, and will close on 24 December at 13:35 CET.

In addition, the Long-Term Resale is now open and will close today at 13:18 CET. Should you have any resales to submit, please ensure they are submitted within this timeframe.

Please note that, due to a technical issue, incorrect capacity was offered for the Monthly auctions on the FR<>ES corridors for the January period.

As a result, the following auctions have been cancelled:

FR-ES-M-BASE-------260101-01

ES-FR-M-BASE-------260101-01

A separate market message will be sent soon with the 2nd round auction timings.

Thank you for your understanding.

1. TSO(s)*:

SWISSGRID

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 / hour for each concerned period:

23-12-2025 08:00 - 09:00 2859 MW

23-12-2025 09:00 - 10:00 2859 MW

23-12-2025 10:00 - 11:00 2859 MW

23-12-2025 11:00 - 12:00 2859 MW

23-12-2025 12:00 - 13:00 2859 MW

23-12-2025 13:00 - 14:00 2859 MW

23-12-2025 14:00 - 15:00 2859 MW

23-12-2025 15:00 - 16:00 2859 MW

23-12-2025 16:00 - 17:00 2859 MW

23-12-2025 17:00 - 18:00 2859 MW

23-12-2025 18:00 - 19:00 2859 MW

23-12-2025 19:00 - 20:00 2859 MW

5. Amount of LTTR remaining after curtailment:

23-12-2025 08:00 - 09:00 2031 MW

23-12-2025 09:00 - 10:00 2031 MW

23-12-2025 10:00 - 11:00 1982 MW

23-12-2025 11:00 - 12:00 2121 MW

23-12-2025 12:00 - 13:00 2277 MW

23-12-2025 13:00 - 14:00 2053 MW

23-12-2025 14:00 - 15:00 2053 MW

23-12-2025 15:00 - 16:00 1982 MW

23-12-2025 16:00 - 17:00 1982 MW

23-12-2025 17:00 - 18:00 1886 MW

23-12-2025 18:00 - 19:00 2031 MW

23-12-2025 19:00 - 20:00 2053 MW

1. TSO(s)*:

TERNA, APG

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:

23-12-2025 12:00 - 13:00 271 MW

23-12-2025 13:00 - 14:00 271 MW

23-12-2025 14:00 - 15:00 271 MW

23-12-2025 18:00 - 19:00 271 MW

23-12-2025 19:00 - 20:00 271 MW

23-12-2025 20:00 - 21:00 271 MW

5. Amount of LTTR remaining after curtailment:

23-12-2025 12:00 - 13:00 186 MW

23-12-2025 13:00 - 14:00 171 MW

23-12-2025 14:00 - 15:00 171 MW

23-12-2025 18:00 - 19:00 160 MW

23-12-2025 19:00 - 20:00 161 MW

23-12-2025 20:00 - 21:00 160 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

1. TSO(s)*:

TERNA, APG

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:

23-12-2025 07:00 - 08:00 204 MW

23-12-2025 08:00 - 09:00 204 MW

23-12-2025 10:00 - 11:00 204 MW

23-12-2025 13:00 - 14:00 204 MW

23-12-2025 14:00 - 15:00 204 MW

23-12-2025 15:00 - 16:00 204 MW

23-12-2025 16:00 - 17:00 204 MW

23-12-2025 17:00 - 18:00 204 MW

23-12-2025 18:00 - 19:00 204 MW

23-12-2025 19:00 - 20:00 204 MW

23-12-2025 20:00 - 21:00 204 MW

23-12-2025 22:00 - 23:00 204 MW

23-12-2025 23:00 - 24:00 204 MW

5. Amount of LTTR remaining after curtailment:

23-12-2025 07:00 - 08:00 181 MW

23-12-2025 08:00 - 09:00 181 MW

23-12-2025 10:00 - 11:00 181 MW

23-12-2025 13:00 - 14:00 177 MW

23-12-2025 14:00 - 15:00 177 MW

23-12-2025 15:00 - 16:00 173 MW

23-12-2025 16:00 - 17:00 173 MW

23-12-2025 17:00 - 18:00 165 MW

23-12-2025 18:00 - 19:00 173 MW

23-12-2025 19:00 - 20:00 176 MW

23-12-2025 20:00 - 21:00 173 MW

23-12-2025 22:00 - 23:00 181 MW

23-12-2025 23:00 - 24:00 177 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