1. DN Interruption Reform Gas Customer Forum Mark Freeman 10 March 2008

2. DN Interruption Reform National Grid Shipper/Consumer Seminars  December 2007 Roadshows  LancasterDec 4 th  DoncasterDec 5 th  LeicesterDec 7 th  LiverpoolDec 10 th  ManchesterDec 11 th  February 2008 seminars  NottinghamFeb 19 th  ManchesterFeb 21 st

3. Interruption Requirements Locational East Anglia LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Estimate (GWh) MinMax EAStowmarketIP6, IP8, IP14, IP305450.69

4. NG Interruption Zones & Interruption Requirements 2011/12 - East Anglia (indicative) Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day EA A450.69 Total0.69GWh/Day Present interruption24 GWh/day Peak Day Total Network Demand412GWh/Day Peterborough Norwich Chelmsford Ipswich Cambridge Luton A

5. Interruption Requirements Locational East Midlands LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Estimate (GWh) MinMax EMDigbyLN45200.11 EMBurtonDE12, DE13, DE14, DE655400.33 EMCoalvilleLE675200.18 EMClay CrossS45, DE555200.20 EMWorksopS80, S815200.53 EMDoncasterDN4, DN55450.28 EMBarnby DunnDN1-3, DN7, DN85451.13 EMBarnsleyS70-S755451.84 EMScunthorpeDN15-195451.51

6. NG Interruption Zones & Interruption Requirements 2011/12 - East Midlands (indicative) Northampton Leicester Nottingham Rotherham Lincoln Boston Skegness A B C D E F G H I Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day EM A200.11 EM B400.33 EM C200.18 EM D200.2 EM E200.53 EM F450.28 EM G451.13 EM H451.84 EM I451.51 Total6.11GWh/Day Present interruption48 GWh/day Peak Day Total Network Demand543 GWh/Day

7. Interruption Requirements Locational North West LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Est. (GWh) MinMax NWEarbyBB18, BB9, BB8, BD235250.14 NWAccringtonBB55450.17 NWNorth lakesLA8-9, LA21-235450.83 NWStalybridgeOL65200.13 NWAppleby BridgeWN65450.12 NWKnutsfordWA165450.24 NWHall GreenSK9, SK105451.25 NWRamsbottomBL0, BL8, BL95450.65 NWWinsfordCW7, CW9, CW105200.45 NWBramhallSK75450.14

8. NG Interruption Zones & Interruption Requirements 2011/12 - North West (indicative) Barrow in Furness Blackpool Liverpool Manchester Crewe Bolton Lancaster A B C D E F G H I J Max. Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day NW A250.14 NW B450.17 NW C450.83 NW D200.13 NW E450.12 NW F450.24 NW G451.25 NW H450.65 NW I200.45 NW J450.14 Total4.12 GWh/Day Present interruption44 GWh/day Peak Day Total Network Demand597 GWh/Day

9. Interruption Requirements (LTS) - Indicative LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Est. (GWh/d) MinMax EAFakenhamNR21, NR225200.4 EMHooton RobertsDN4, DN12, S63, S645100.14 EMGranthamNG315100.75 EMSheringtonMK16, NN1, NN4, NN5, NN6, NN7, LE17 5101.7 EMThrapstonNN3, NN5, NN6, NN8, NN9, NN14, NN29 5101.0 NWBarrowLA12, LA14, LA185104.0 NWBarrowfordBB1-3, BB5-12, BB185100.47 NWWinsfordCW7-10, M5, M14, M19, M22- 24, M31, M34, M41, M90 5202.5 NWNew MillsSK1, SK4-8, SK12-14, SK16, SK22 5100.3

10. EA NG LTS Interruption Zones & Interruption Requirements 2011/12 – East Anglia (indicative) Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day EA200.4 Total 0.4 GWh/Day Chelmsford Luton Cambridge Peterborough Ipswich Norwich

11. EM A B C Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day EM A100.14 EM B100.75 EM C101.0 EM D101.7 Total 3.59 GWh/Day D NG LTS Interruption Zones & Interruption Requirements 2011/12 – East Midlands (indicative) Northampton Leicester Nottingham Boston Lincoln Skegness Rotherham

12. A B C D Barrow in Furness Blackpool Liverpool Manchester Crewe Lancaster Bolton Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day NW A104.0 NW B100.47 NW C100.3 NW D202.5 Total7.27 GWh/Day NG LTS Interruption Zones & Interruption Requirements 2011/12 - North West (indicative)

13. East Anglia Actual Interruption - Days locational by postcode

14. East Midlands Actual Interruption - Days locational by postcode

15. North West Actual Interruption - Days locational by postcode

16. Actual Interruption days by LDZ Volume by postcode

17. Actual Interruption days by LDZ