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XRN 4900
Biomethane Sites with Reduced Propane Injection

Last Updated
28 Mar 2023
Release Type
Implementation Date
25 Feb 2023
Proposer Scotland and Southern Gas Networks (SGN) Impacted DSC service area


Not applicable

Customer Change Team Leader


To facilitate the correct energy balancing / billing and transportation charging (use of a site-specific CV and energy adjustments), SGN requires Xoserve to provide solution options considering impacts on:

  • LDZ System commodity invoice,
  • LDZ Entry invoice,
  • NTS commodity invoice(s)) and,
  • the relevant Shipper’s energy balancing position
  • Capacity charging (incorrect consumptions would lead to incorrect AQs and possibly incorrect SOQs)
  • Impacts of meter reads, reconciliation, ratchets, check-check reads, site visits
  • Adjustments received after D+5 exit close-out

Any acceptable solution option should be considered a pragmatic, tactical solution. Cadent’s Future Billing Methodology (FBM) Project is assessing the possibility to introduce sub-LDZ CV charging zones. It is anticipated a future rollout of FBM will provide a robust and enduring solution that will support the revised biomethane arrangements.

Impacted Customer Types

  • Shipper
  • DNO


Document title Comment Last updated CHMC outcome
Change Proposal Approved 11/08/2021 Approved into Capture 11/08/2021
Initial Review Stage not used N/A N/A
DSG Discussions N/A 06/06/2022 N/A
High Level Solution Options N/A 11/08/2021 N/A
Solution Review Approved 11/08/2021 Approved into Design 11/08/2021

Detailed Design

Detailed Design 

Detailed Design

Detailed Design

3034.1 - MT - PO

3069.6 - KL - PO

3098.1 - RT - PO

3120.2 - VO - PO





Approved at ChMC on 08/06/2022

Approved at ChMC on 10/08/2022

Approved at ChMC on 09/11/2022

Presented for information at ChMC on 11/01/2023

Evaluation Quotation Reports (EQR) Approved 08/12/2021 EQR Approved 08/12/2021
Business Evaluation Reports (BER) N/A 28/03/2023 Approved at ChMC on 29/07/22
XRN 4900 e-learning Online e-learning session 09/02/2003 N/A
Change Completion Reports (CCR) Stage not yet reached N/A N/A


Initial Review
Change Proposal Raised 29/07/21
Status Awaiting ChMC approval
Approved to Capture 11/08/21
Status ChMC approved into Capture
Solution Consultation
Solution Consultation 16/08/21
Status Solution Change Pack Issued
Awaiting Delivery
ChMC approved solution 08/09/21
Status Detailed Design approved 08/06/2022
In Delivery
Detailed Design Re-issued 18/07/2022 10/08/22
Status Approved at ChMC 10/08/22, re-issue approved at ChMC 09/11/22. Re-issue DD for info at ChMC 11/01/23
Expected: 25/02/23
Status Successfully Implemented

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