1. Replacement of Any Read – Initial views

2. 2 Assumptions  Can’t re-open NDM Allocation or Energy Balancing after D+5  Can’t go back to a read before prevailing Line-in-the- Sand date

3. 3 Impacts on NDM Reads READ 1READ 2 READ 3 VOLUME 1 VOLUME 2 Replaced Read New Volume 1 New Reconciliation 1 New Volume 2 New Reconciliation 2 New Filter Failure? New Filter Failure? NOTE: If Read 2 = Opening Read, need prior Shipper agreement to change this read Cancel any outstanding Filter Failures

4. 4 Impacts on NDM AQs READ 1READ 2 READ 3 VOLUME 1 If Replaced Read was used as start or end read for current or previous AQ … Replaced Read Revised AQ New Volume 1 Historic data invalidated, e.g. MRF? Revised Capacity Charges and Commodity Transportation Rates NOTE: Could impact a previous Shipper’s AQ and charges VOLUME 2 Historic charges invalidated, e.g. Must reads? SHIPPER A SHIPPER A or SHIPPER B NOTE: No filter mechanism for erroneous charges Need to review historic charges, e.g. Mod 640 Threshold Crossers?

5. 5 Impact of Change of Read outside of Ownership  Shipper may initiate change prior to or after their ownership  Other Shipper(s) volume amended  Other Shipper(s) approval required to amend volumes?  Can other Shipper change the volume back if they disagree?  Could lead to “yo-yoing” changes  Should the number of changes be limited?