1. Copyright National Grid Metering 11-01-08 NGM Daily Meter Reads UNC RG 0175

2. Copyright National Grid Metering 11-01-08 Overview of NGM Datalogger Read Process Flow Provide remote access to Gas Shippers Calculate and produce DM invoices Deliver Files to Customers Communication Cloud XOSERVE Meter & Logger Collection Modems Data Processing Server IX 35 HR

3. Copyright National Grid Metering 11-01-08 Metscan / Metretek Main Activities Collect call data from units Schedule units for next call slot Store interval and time of call data Calculate and store exact 6am reading Create file’s at scheduled times DLCS Activity Receive files and validate for format Carry out validation routines (consumption, Convertor tolerance etc) Produce validation warnings and failures for investigation Create files, in appropriate formats and deliver to shedule Collect and record changes of shipper, DM Inter/ Firm and NDM status to apply to file delivery Produce monthly invoice for DM Asset rental and DM read provision charges Overview of NGM Datalogger Read Collection Process Collect Data from Datalogger Units Validate, store & Deliver to customers Provide remote access to Gas Shippers Remote Access System Provide shipper access to hourly interval consumptions to gas shippers. Update every 4 hours with hourly data Calculate and produce DM invoices DM Invoicing Produce monthly invoice for DM Asset rental and DM read provision charges Deliver Files to Customers

4. Copyright National Grid Metering 11-01-08 Data DeliveryFrequencyDelivery PointOverview of Content 1. DM Daily Read FileDaily by 8:15amXoserveStart and End of Gas day readings for DM sites 2. Unique Site Daily Reading File Daily by 11amShippersStart and End of Gas day readings for Unique Sites 3. DM Bulletin BoardEvery 4 hoursRemote access system.Hourly consumption data for shipper access. 4. NDM Daily Reading fileDaily delivered at D+14XoserveValidated Gas day readings and consumption data for DM’s and NDM’s Dataloggers. 5. Hourly Interruptible DataEvery 4 hours from 6amNational Grid Gas - OperationsHourly consumption data. 6. Hourly DM Firm DataEvery 4 hours from 6amNational Grid Gas - OperationsHourly consumption data. 7. 7am Interruptible hourly dataDailyNational Grid Gas - OperationsInterruptible hourly Consumption data from 6 – 7am. 8. 7am DM Firm hourly dataDailyNational Grid Gas - OperationsDM Firm hourly Consumption data from 6 – 7am. 9. Interruptible Daily FileDailyNational Grid Gas - OperationsHourly consumption data from the previous 24 hours. 10. DM Firm Daily FileDailyNational Grid Gas - OperationsHourly consumption data from the previous 24 hours. 11. Unique Site Daily Reading File DailyXoserveStart and End of Gas day readings for Unique Sites. Daily Read Delivery Requirements

5. Copyright National Grid Metering 11-01-08 Process Flows  Read Delivery  Liabilities  Asset Changes (MEX,DL Installs, DL Removals)  Faults & Maintenance  DM Queries From Shippers  Queries From Ops & Trading  All Invoicing  Information to IDN’s

6. Copyright National Grid Metering 11-01-08 Read Delivery Process Flows 16.0

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8. Liabilities Process Flows 2.0

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10. Asset Changes Process Flows 1.0, 5.0, 5.1, 6.0, 7.0

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16. Faults & Maintenance Process Flows 14.0, 15.0, 17.0

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20. DM Queries From Shippers Process Flows 13.0

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22. Queries From Ops & Trading Process Flows 18.0, 19.0

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25. All Invoicing Process Flows 8.0, 9.0, 12.0, 11.0

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30. Information To IDN’s Process Flows 20.0

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