2026/2027 T-4 Capacity Auction Submission Commencement

Affected Period



Run type

15/03/2023 10:00

Last Updated
25/09/2023 21:39

Dear Capacity Market Participant,

Auction Gate Open

Please be advised that the Capacity Auction Submission for the 2026/2027 T-4 Capacity Auction commenced this morning at 10am, as scheduled in the approved T-4 Capacity Auction Timetable. Participants are now able to submit Capacity Auction Offers in respect of Capacity Market Units Qualified to participate in the 2026/2027 T-4 Capacity Auction via the Capacity Market Platform (CMP).

We would recommend Participants submit their Offers within CMP as early as possible to ensure that all Auction Participants can access CMP and submit their Offer(s) without encountering any system access issues. Please note that once an Offer is submitted, Participants may edit or delete such Offers at any stage before the Capacity Auction Submission End at 10:00am on 23rd March 2023. Please refer to the Capacity Market Platform Offer Information Guide for reference. 

CMP Access

A quick reminder as previously communicated, can all Participants please ensure that they have tested their access to the CMP, as failure to have a valid digital certificate will impede your participation in the upcoming Auction. 


If you encounter any problems with the Capacity Market Platform during the 2026/2027 T-4 Capacity Auction, please send us an email with screenshots to capacitymarket@sem-o.com and will endeavour to address the issue with you as quickly as possible.

Supporting Materials

The following supporting material is available on the SEMO website:

·       Capacity Market Code

·       Final Auction Information Pack (FAIP2627T-4)

·       CMPT Guide

Should you have any further queries, please do not hesitate to get in touch.

Kind regards,

Capacity Market Team