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Nexus Workgroup Read V alidation Scenarios

This document outlines the validation scenarios related to read tolerances for Class 4 sites, as discussed during the workgroup meeting on October 30, 2013. It explains potential issues with using a 'flat profile' for the Allocation Quantity (AQ) calculations and highlights the need for a thorough examination of these tolerances. The scenarios analyzed include cases where gas consumption has been inactive, changes in plant operations, and class transitions. Each scenario presents outcomes and correction processes for recalibrating AQ values to ensure read validations are appropriately managed.

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Nexus Workgroup Read V alidation Scenarios

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  1. Nexus WorkgroupRead Validation Scenarios 4th December 2013

  2. Background • Read Validation rules and tolerances developed during the Settlement BRD • Concern raised at 30th October workgroup that the tolerances may not be appropriate for Class 4 sites as a ‘flat profile’ is used (AQ / 365 x no. of days in period). • Workgroup agreed the principle of read validation was correct but would like to examine the tolerances further • The following slides provide a list of various scenarios considered by Xoserve during analysis of the AQ requirements to validate the principles & tolerances described in the BRD

  3. Scenarios • AQ = 1 • Reason: the site has not been consuming gas for over 9 months • Consequence: read will fail validation • Outcome: AQ Correction process used to re-calculate the AQ then re-submit the read • AQ is significantly higher or lower than sites predicted consumption • Reason: change in plant or site previously ‘mothballed’ • Consequence: read may fail validation • Outcome: AQ Correction process used to re-calculate the AQ then re-submit the read

  4. Scenarios cont. • Site Isolated • AQ would carry over until 9 months consumption was available during the non-isolated period therefore read would not fail • Vacant site • AQ would reduce as reads are loaded with zero/low consumption over a period • If read fails due to the AQ being low, the AQ Correction process to be used to amend AQ • Round The Clock value incorrect/not populated • Read would fail due to out of tolerance • Re-submit read with correct ‘Round the Clock’ (TTZ) count

  5. Scenarios cont. • Change of Class – Class 4 to 2 • SOQ is used to validate the reads, Shipper nominates the SOQ • Change of Class – Class 2 to 4 • Daily reads previously loaded for site and AQ reviewed monthly. Reads should therefore pass the validations based on AQ

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