Operational issues with Modification 0665 - Changes to Ratchet Report

We would like to make customers aware that we have recently encountered a number of operational issues when issuing the MOD665 - Changes to Ratchet reports (further information regarding MOD665 is provided below).

Our operational team is currently investigating these issues and will provide a further detailed update w/c 13th September 2021, once these have been fully resolved.

Modification 0665 – Changes to Ratchet Regime was approved by Ofgem on 29 March 2019 and the associated updates to the Uniform Network Code were implemented on 01 July 2019.

This modification amends the current Class 2 Ratchet Charging Arrangement, as well as allowing Transporters to identify Supply Points that are not in Class 1 that should be subject to the existing Class 1 Ratchet Charging Arrangement. For additional details on the modification please see the following link.

No further action is required by customers at present, however if you have any further questions, please contact our Issue Management Team at

UIG Allocation Issues

There are currently no issues with UIG allocation

NEW - Interactive Unidentified Gas (UIG) Data Charts

We’ve launched two new interactive versions of charts showing i) Daily National UIG as a percentage of total throughput (D+1 vs D+5) and ii) Monthly UIG as a percentage of total throughput at initial Allocation and after Reconciliations processed to date.

Both charts are available via the ‘UIG Interactive Data’ area here or from the Xoserve homepage click Services and using the Issue Management dropdown list, select Unidentified Gas (UIG).

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