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XRN 4900
Biomethane Sites with Reduced Propane Injection

Last Updated
10 Jun 2022
Release Type
Implementation Date
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 titleCommentLast updatedCHMC outcome
Change ProposalApproved11/08/2021Approved into Capture 11/08/2021
Initial ReviewStage not usedN/AN/A
DSG DiscussionsN/A06/06/2022N/A
High Level Solution OptionsN/A11/08/2021N/A
Solution ReviewApproved11/08/2021Approved into Design 11/08/2021
Detailed DesignApproved10/06/2022Approved at ChMC on 08/06/2022
Evaluation Quotation Reports (EQR)Approved08/12/2021EQR Approved 08/12/2021
Business Evaluation Reports (BER)Stage not yet reachedN/AN/A
Change Completion Reports (CCR)Stage not yet reachedN/AN/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
Expected: 00/00/00
Status Awaiting
Expected: 00/00/00
Status Awaiting

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