Upcoming System Outage - Tuesday 16th September 2025

04/09/2025

Please be aware that there will be the following upcoming system outage taking place on Tuesday 16th September 2025 (between 16:00-19:15) which will affect some elements of Operational data displayed through the National Gas Data portal.

Affected GCS data flows to National Gas Data Portal and Instantaneous Flows are as follows:

National Gas Data Portal:

• PCLP Data (Published via ANS at 17:05 if required)
• Forecast Flows (Supply)
• Physical Flows (Supply)

Instantaneous Flows:

• Physical Flows (Supply) - Outage takes last known good value for the duration. 

Gemini Restricted Service Notification - Tuesday 9th September 2025 between 09:00 and 10:00 BST

28/08/25

Please be aware that National Gas is changing over to a new Energy Identification Code (EIC) on Tuesday 9th September. Users of the two APIs below are required to change the EIC code in the appropriate payload requests. Please do not place any API requests for the two APIs listed below between 09:00 and 10:00 (BST). 

1. View IP Nomination (data item: RECIPIENT_MARKETPARTICIPANT.IDENTIFICATION)

2. Add/Update IP Nomination (data item: INTERNALACCOUNTTSO)

This is to ensure that API requests continue to be recognised by Gemini. If this update is not done by Shippers, then any API requests made containing the old EIC Code will be rejected.

There will be no impact to any IP nominations that have be placed prior to the implementation date as these will have already flowed through to the TSOs to confirm the re/nominations.

Please note online access to Gemini will continue to be available. Only the two impacted APIs will not be available during the implementation window all other API will continue to be available.

Gemini Restricted Service Notification - Sunday 24th August 2025

11/08/25

Please be aware that we are carrying out maintenance on our Gemini batch scheduling environment on Sunday 24th August, between the hours of 03:00 – 05:00 British Summer Time. All Gemini online and API services will continue to be available at this time. 

Please do not place any EU Nomination (Day Ahead) or IP Trades/Transfers during this two-hour period, as any that are placed will not be approved. Please take this into account during your operational planning

Gemini Restricted Service Notification - Monday 16th June 2025

13/06/25

Please be aware that on Monday 16th June, between the hours of 10:00 and 11:00 British Summer Time, we will be working with our adjacent TSO partners to complete the essential maintenance to renew the Gemini domain certificate. 

We advise you not to place EU nominations during this time as there is a risk that they will not be processed. Please can you take this into account during your operational planning

Upcoming System Outage - Tuesday 24th June 2025

12/06/25

Please be aware that there will be the following upcoming system outage taking place on Tuesday 24th June 2025 (between 16:00– 19:15) which will affect some elements of Operational data displayed through National Gas Data portal. 

Affected GCS data flows to National Gas data portal and GMRS are as follows: 

 MIPI 

• PCLP data (Published via ANS at 17:05 if required).
• Forecast Flows (Supply).
• Physical Flows (Supply).        

 GMRS 

Physical Flows (Supply) - Outage takes last known good value for the duration.