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XRN 5186
Modification 0701: Aligning Capacity booking under the UNC and arrangements set out in relevant NExAs

Last Updated
06 Nov 2023
Release Type
Implementation Date
04 Nov 2023
Proposer NGN Impacted DSC service area

Service Area 3 (Current Apr 21)

Manage updates to customer portfolio

Customer Change Team Leader


There is no process to ensure that the Supply Point Capacity (Often referred to as “SOQ”) and Supply Point Offtake Rate (often referred to as “SHQ”) allowed in a NExA (which is a contract between the site operator and the Transporter) and that allowed by the UNC (which is contract between the Relevant Shipper and the relevant Transporter) are aligned. This can result in discrepancies where the Shipper books more capacity on the System than the customer is allowed to use in accordance with the NExA.


Modification 0701 has been raised and seeks to improve visibility where a consumer has entered into a bi-lateral Network Exit Agreement (NExA) with the relevant Transporter and to link capacity increases with the NExA so that the allowed capacity does not exceed the capacity as agreed in the NExA.


This Change Proposal has been raised to deliver the system requirements set out within this Modification.


The Interim solution was implemented on 12/09/2022.  The enduring solution proposed implementation November 23.



Impacted Customer Types

  • Shipper
  • DNO


Document title Comment Last updated CHMC outcome
Change Proposal Approved 10/06/2020 Approved into Capture on 10/06/2020
Initial Review Stage not used N/A N/A
DSG Discussions N/A 27/06/2022 N/A
High Level Solution Options N/A 11/08/2021 N/A
Solution Review Approved 08/09/2021 Solution Approved 08/09/2021
Detailed Design 3050.2 - RT - PO 13/06/2022 ChMC approved the design on 13/07/2022
Detailed Design - interim solution 3078.3 - MT - PO 12/09/2022 Interim Detailed Design issued on 15/08/2022
Presented for information at ChMC 07/09/22
Evaluation Quotation Reports (EQR) Approved 08/12/2021 EQR Approved at ChMC on 08/12/2021
Business Evaluation Reports (BER) Stage not yet reached N/A N/A
XRN 5186 e-learning Online e-learning session 12/10/2023 N/A
Change Completion Reports (CCR) Stage not yet reached N/A N/A


Initial Review
Change Proposal Raised 25/05/20
Status Approved at ChMC 10.06.2020
Expected: 00/00/00
Status Approved into Capture
Solution Consultation
Solution Change Pack Issued 16/08/21
Status ChMC approved solution 08/09/2021
Awaiting Delivery
Design Change Pack issued for enduring solution approved 13/07/22
Status Design Change Pack issued for interim solution approved and now implemented on 12/09/2022
In Delivery
Approved into November 2023 Major Release Scope at April ChMC 12/04/23
Status Awaiting
Expected: 04/11/23
Status Successfully implemented

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