*Update* SEMOpx Information - DST25 2025
Affected Period
Status
Closed
Category
Semopx
Run Type
Created
Last Updated
Updated Message 16/10/2025;
Dear SEMOpx Member,
Please find an updated version of the SEMOpx Info DST25_2025 document, which includes a section on REMIT Reporting, now published in the SEMOpx Member’s Area.
Kind regards,
SEMOpx Team
________________
Original Message 10/10/2025;
Dear SEMOpx Member,
On Sunday, 26 October 2025, the time will be set back one hour from 2am BST to 1am GMT due to the transition from daylight saving time (DST) to normal time (long clock change). Hence, 25 hours will be available for trading instead of 24 hours.
Please note the following special trading procedures which apply to trading day Saturday, 25 October 2025 for delivery day Sunday, 26 October 2025.
We highly recommend you participate in the member tests that will take place on 14 and 20 October 2025.
There is no registration needed to participate in the DST tests. You will simply need to connect to the MATS simulation 2 environment and place your bids for trading day 25 October 2025 (delivery day 26 October 2025). Prior to the Member Tests, we kindly ask you to verify that you have the required Simu2 credentials. If you need the details, please contact: marketops@ops.semopx.com.
Please find below the auctions that will be run and their respective orderbook closure times expressed in BST.
For the more information, please see the document SEMOpx Info DST 25_2025 and SEMOpx DST25 Sample Files 2025
| Date of the test | Session | Order book opening | Auction date | Order Book Closure Time | |
| SEMOpx DAM* | SEM IDA1* | ||||
| 14/10/2025 | DST 25 | Already open | 25/10/2025 | 13:15 BST | 16:00 BST |
| 20/10/2025 | DST 25 | Already open | 25/10/2025 | 13:15 BST | 16:00 BST |
Please do not hesitate to contact us at info@semopx.com should you have any questions.
Kind regards,
SEMOpx Team