UK Link Technology Refresh Annie Griffith March 2008

UKLTR Cutover Completed successfully ahead of schedule Quicker than expected due to :- Less data needing final migration, enabling data to be transferred across network Higher than expected speeds of data transfer across networks (75Mb vs. 45Mb) No rectification activities being needed Less time needed for batch catch-up All business verification activities brought forward First files released externally 15:00 Monday 25th

Snags & Issues IAD Refresh had some minor problems and took longer than planned to bring completely in line 47 shipper files were not transferred during re-pointing the file routing from National Grid data centre to UK Link data centre. These were restored and processed successfully on 29th Feb Result of processing was identical to processing on Wednesday 27th No knock-on impacts Initial release of first files of each file type were slightly later than usual schedule, as all were pre-verified by xoserve prior to release.

Observations Still not completed full month of invoicing cycle, although most major invoice types hae now been issued successfully Capacity issued Commodity issued Ad hoc issued Energy Balancing issued NTS Entry and Exit capacity issued Reconciliation outstanding – due for issue 28th March First production of any file type will still be checked prior to issue

Overall Summary Very successful implementation with low levels of defects and issues Production operation of new UK Link has shown improvements on batch run times across all jobs Daily meetings still being held to chase down any issues/snags Close monitoring of system continuing throughout Post Implementation Support phase Formal project closure – end May ‘08