Gemini Autumn Clock Change Update

The Autumn Clock Change from British Summer Time (BST) to Greenwich Mean Time (GMT) will take place on Sunday 25 October 2026. At 02:00 BST, the clocks will move back one hour to 01:00 GMT.

Please be aware that Gemini will operate a restricted service during the first hour of GMT (01:00–02:00 GMT). During this period, a number of Gemini business processes will be impacted, including:

• Within Day Auctions
• GB Renominations
• EU Nominations

For further information, including details of all identified Gemini impacts, please refer to the Support Information slide pack provided here

If you have any questions regarding the impact of the Autumn Clock Change on Gemini, please contact the Operational Liaison team at [email protected].

Daily Margin Notice and Safety Monitor Position & Margin Notice Forecast Position

From October 2026, Daily Margin Notice and Safety Monitor Position & Margin Notice Forecast Position reports will only be available via the National Gas Data Portal 

From October 2026, please follow this navigation route Reports > Energy - Daily Reports > Pre Day - Within Day to find these reports within the National Gas Data Portal