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XRN 5450
Demand tool to support Urgent Modification 0788 - Minimising the market impacts of ‘Supplier Undertaking’ operation

Last Updated
21 Apr 2022
Release Type
Implementation Date
18 Feb 2022
Proposer National Grid Impacted DSC service area


To be confirmed

Customer Change Team Leader


Modification 0788 - Minimising the market impacts of ‘Supplier Undertaking’ operation was implemented on 01 November 2021. This provides the ability for Suppliers who are operating under a DoU following the Termination of the Shipper User, to make arrangements with another Shipper User to source additional supplies of gas and make trade nominations to the Terminated Shipper User account to balance that portfolio and mitigate increased costs, until a new ‘Registered User’ is appointed.

XRN5443 was raised to accommodate the Modification 0788 process. Under XRN5443, as per Modification 0788, the CDSP will send the new Shipper relevant TSMPs information and the new Shipper is responsible for confirming the demand for the TSMPs they have agreed to supply gas for.

It has been acknowledged between National Grid and the CDSP that there could be a scenario where a new Shipper looking to supply gas for the TSMPs doesn’t have the ability to work out the estimate demand or simply wants the CDSP to provide this estimate.

To address this scenario, this Change Proposal has been raised to create and make available where required, a demand tool which in the event of a Shipper termination, the tool would allow the CDSP to calculate estimate demand at Supplier level enabling the Supplier to enter an arrangement with a new Shipper to offset the demand, via a trade, with the Terminated Shipper.

Impacted Customer Types

  • NGT
  • Shipper


Document title Comment Last updated CHMC outcome
Change Proposal N/A 21/04/2022 N/A
Initial Review N/A N/A N/A
High Level Solution Options N/A N/A N/A
Solution Review N/A N/A N/A
Detailed Design N/A N/A N/A
Evaluation Quotation Reports (EQR) N/A N/A N/A
Business Evaluation Reports (BER) N/A 16/02/2022 Approved
Change Completion Reports (CCR) N/A 21/04/2022 Approved


Initial Review
Change Proposal Raised 01/11/21
Status Awaiting ChMC Approval
Approved to Capture 08/12/21
Status ChMC approved into Capture
Solution Consultation
Expected: 00/00/00
Status Stage not used
Awaiting Delivery
Expected: 00/00/00
Status Stage not used
In Delivery
Design Change Pack N/A - Please refer to the CP 01/02/22
Status BER for approval at February ChMC
Implemented 18/02/22
Status Change Implemented 18/02/2022

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