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XRN 5579A
Long-Term Flow Swap Automation

Last Updated
31 Mar 2023
Release Type
Implementation Date
19 Mar 2023
Proposer National Gas Transmission Impacted DSC service area

Service Area 14 (Current Apr 21)

Gemini Services

Customer Change Team Leader


National Gas Transmission (NGT) are proposing an update to the Gemini system to improve the Long-Term Flow Swap (LTFS) process.

Currently Gemini only allows users to manually add the LTFS details daily, this can lead to errors which have added significant work to NGT’s time-constrained month-end financial reporting processes.

Following completion of this change, NGT and DNO Users would be able to enter the LTFS details for a period of time. Cancel and Accept functionality will also be introduced to reject/accept the flow swap details.

This change only impacts NGT and Distribution Network Operator (DNO) users of the system and is scheduled to go live 19 March 2023.

Impacted Customer Types

  • NGT
  • DNO


Document title Comment Last updated CHMC outcome
Change Proposal Change Proposal Raised 10/03/2023 Presented to ChMC 08/03/2023 for information only 
DSG Discussion N/A 31/03/2023 N/A
Detailed Design 3139.1 - VO - PO 13/03/2023 Approved at ChMC 08/03/2023
Change Completion Reports (CCR) Stage not yet reached   N/A


Initial Review
CP Raised 09/02/23
Status Presented at ChMC 08/03/02023 for information
Expected: 00/00/00
Status Stage not required
Solution Consultation
Expected: 00/00/00
Status Stage not required
Awaiting Delivery
Expected: 00/00/00
Status Stage not required
In Delivery
Detailed Design Issued 13/02/23
Status Approved at ChMC 08/03/2023
Due to be implemented 19/03/23
Status Successfully implemented

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