It is proposed to amend the 501S message -To advise the NQH consumption differences calculated in
Re-Aggregation during a Reconciliation Period for the provision of differences at 15 min intervals rather
than currently at rolled up single day and night difference.
This additional data is required for Resettlement from start of 2005 – effectively as well as amending
market messages from a particular date to give the additional data there is also a requirement to provide
historical data.
All consumption differences in all segments of the message are to be provided at 15 min intervals ie
consumption differences both with and without DLF at the Supplier/SSAC levels and those without DLF
at the lower level of DLF/Load Profile.

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