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XRN 5602
Releasing of unused capacity under a specific set of circumstances (Modification 0818)

Last Updated
26 Apr 2023
Release Type
Implementation Date
Proposer Xoserve Impacted DSC service area

Service Area 3 (Current Apr 21)

Manage updates to customer portfolio

Customer Change Team Leader


Please note that due to a decision by Ofgem to reject Modification 0818 - Releasing of unused capacity under a specific set of circumstances, XRN5602 has been withdrawn.


This change was raised to deliver the requirements set out under UNC Modification 0818 - Releasing of unused capacity under a specific set of circumstances. This Modification has been raised to release unused capacity (only where an SMP meets a specific criteria).

The Change Proposal will implement a process to deliver the Modification 0818 requirements which involves the following:

- A DNO can request that a Shipper reduces a SMPs capacity if the SMP meets a strict criteria and is on an area of the network with restricted capacity available to other Registered Users / end consumers. Please note, the criteria which the SMP would be required to meet is outlined in the Solution section of Modification 0818.

- The relevant Shipper of the SMP will have the opportunity to appeal the reduction in capacity.

- If following the appeal process, a capacity reduction is still required, the Shipper should submit a Supply Point Amendment to reduce the capacity from 01 October in the relevant year.

- If the relevant Shipper does not submit a successful Supply Point Amendment to reduce the capacity to the DNO agreed values by 31 October, the CDSP will reduce the capacity on their behalf.

- MOD 818 is a material change and subject to Ofgem approval.

For further details on the criteria for a site to meet the 0818 process and the appeal process / timelines, please see the Modification which can be found here:

Impacted Customer Types

  • Shipper
  • DNO


Document title Comment Last updated CHMC outcome
Change Proposal CP raised 13/01/2023 Approved at ChMC 11th January 2023
Initial Review Stage not required    
High Level Solution Options Stage not required    
Solution Review Stage not required    
Detailed Design 3148.2 VO - PO 19/04/2023 ChMC approved
Evaluation Quotation Reports (EQR) Stage not yet reached   N/A
Business Evaluation Reports (BER) Stage not yet reached   N/A
Change Completion Reports (CCR) Stage not yet reached   N/A


Initial Review
CP raised 22/12/22
Status CP will be presented at ChMC for approval at ChMC to proceed into Capture
Approved into capture 11/01/23
Status January ChMC approved into Capture
Solution Consultation
Expected: 00/00/00
Status Stage not required
Awaiting Delivery
Detailed Design Change Pack Approved 11/04/23
Status Ofgem rejected Modification 0818 on 24/04/2023 - This change is now withdrawn
In Delivery
Expected: 00/00/00
Status Awaiting
Expected: 00/00/00
Status Awaiting

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