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XRN 5053
Single Sided Nominations Improvements

Last Updated
13 Jul 2020
Release Type
Implementation Date
05 Apr 2020
Proposer National Grid Impacted DSC service area

Service Area 20

UK Link Gemini System Services

Customer Change Team Leader


The Gemini System does not currently allow a user to have both a Single Sided Nomination (SSN) and a Double Sided Nomination (DSN) for the same date/location combination.

Where a user has submitted a SSN that is not then matched by the adjacent TSO the user is unable to amend it or submit a new request for that same combination.

The TSO BBL does not accept SSNs and so if a user incorrectly submits a SSN they are then unable to submit a DSN instead.

There are 3 elements to the change request, in priority order:

1A) Ability to Withdraw SSNs

Introduce a withdrawal facility whereby a user can withdraw a SSN that has not been confirmed. Once withdrawn the user would be able to place a new request.

1B) Ability to Modify SSNs

Introduce a modify facility such that users can change the various elements of a SSN that has not been confirmed. This would include the ability to change it from a SSN to a DSN.

1C) Error proofing SSN entry

For a SSN we could introduce an auto populate facility for key fields such as the EIC whereby the value entered in the internal shipper EIC field is then copied across to the external shipper EIC field.

Impacted Customer Types

  • NGT
  • Shipper


Document title Last updated Type
XRN5053 - CCR 13/Jul/2020 PDF
XRN5053 CP 04/Dec/2019 PDF


Initial Review
Solution Consultation
Awaiting Delivery
In Delivery

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