2026/2027 T-1 Capacity Auction Timetable Update v1.1
Affected Period
Status
Open
Category
Capacity
Run Type
Created
Last Updated
Dear Capacity Market Participants,
Following the publication of CMC_09_25 and CMC_14_25 decisions, the System Operators have amended the Capacity Auction Timetable for the 2026/2027 T-1 Capacity Auction in line with the CMC Modifications Workshop 43 CMC_09_25 & CMC_14_25 Decision Paper (SEM-25-072) | The Single Electricity Market Committee.
In accordance with D.2.1.11 of the Capacity Market Code, the System Operators are republishing the amended CAT2627T-1 - 2026 2027 T-1 Capacity Auction Timetable v 1.1
The specific changes to the 2026/2027 T-1 Capacity Auction Timetable dates are as set out in the table below. They include the addition of new events A.0, A.1A, A.4A & A.5A, and an update to the title of event A.4.
| Revision 1 | 15/10/2025 | Revision 1.1 | 19/12/2025 | ||||
| Category | Appendix C ref | Event | Date & Time | Category | Appendix C ref | Event | Date & Time |
| Registration | A.0 | Participation Notice Closing Date | 12/01/2026 | ||||
| Qualification | A.1A | Qualification Application Opening Date | 05/02/2026 | ||||
| Qualification | A.4 | Qualification Application Date | 23/02/2026 | Qualification | A.4 | Qualification Application Closing Date | 23/02/2026 |
| Info | A.4A | Indicative Adjustments Submission Date | 07/04/2026 | ||||
| Info | A.5A | Prospective Adjustments Submission Date | 14/05/2026 | ||||
Participants seeking to submit a New Unit in advance of the Participation Notice date, are advised to submit a registration pack as early as possible in order to receive Unit IDs for qualification. Registration packs should be submitted to CapacityMarketRegistration@sem-o.com. Further information and guidance on the requirements for registering New Parties, New Participant, and New Units can be found here.
Kind regards,
Capacity Market Team