Replacement of Any Read – Initial views

2

Assumptions

Can’t re-open NDM Allocation or Energy Balancing

after D+5Can’t go back to a read before prevailing Line-in-

the-Sand date

3

Impacts on NDM Reads

READ 1 READ 2 READ 3

VOLUME 1 VOLUME 2Replaced

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

Impacts on NDM AQs

READ 1 READ 2 READ 3

VOLUME 1

If Replaced Read was used as start or end read for current or previous AQ …

ReplacedRead

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 ASHIPPER A orSHIPPER B

NOTE: No filter mechanism for erroneous charges

Need to review historic charges, e.g. Mod 640 Threshold Crossers?

5

Impact of Change of Read outside of Ownership

Shipper may initiate change prior to or after their ownership

Other Shipper(s) volume amendedOther Shipper(s) approval required to amend

volumes?Can other Shipper change the volume back if they

disagree?Could lead to “yo-yoing” changesShould the number of changes be limited?