DN Interruption Reform Gas Customer Forum Mark Freeman 10 March 2008

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

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

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

Interruption Requirements Locational East Midlands LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Estimate (GWh) MinMax EMDigbyLN EMBurtonDE12, DE13, DE14, DE EMCoalvilleLE EMClay CrossS45, DE EMWorksopS80, S EMDoncasterDN4, DN EMBarnby DunnDN1-3, DN7, DN EMBarnsleyS70-S EMScunthorpeDN

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 A EM B EM C EM D200.2 EM E EM F EM G EM H EM I Total6.11GWh/Day Present interruption48 GWh/day Peak Day Total Network Demand543 GWh/Day

Interruption Requirements Locational North West LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Est. (GWh) MinMax NWEarbyBB18, BB9, BB8, BD NWAccringtonBB NWNorth lakesLA8-9, LA NWStalybridgeOL NWAppleby BridgeWN NWKnutsfordWA NWHall GreenSK9, SK NWRamsbottomBL0, BL8, BL NWWinsfordCW7, CW9, CW NWBramhallSK

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 A NW B NW C NW D NW E NW F NW G NW H NW I NW J Total4.12 GWh/Day Present interruption44 GWh/day Peak Day Total Network Demand597 GWh/Day

Interruption Requirements (LTS) - Indicative LDZInterruption Zone PostcodesInterruptible Allowance (days) Interruptible Capacity Est. (GWh/d) MinMax EAFakenhamNR21, NR EMHooton RobertsDN4, DN12, S63, S EMGranthamNG EMSheringtonMK16, NN1, NN4, NN5, NN6, NN7, LE EMThrapstonNN3, NN5, NN6, NN8, NN9, NN14, NN NWBarrowLA12, LA14, LA NWBarrowfordBB1-3, BB5-12, BB NWWinsfordCW7-10, M5, M14, M19, M22- 24, M31, M34, M41, M NWNew MillsSK1, SK4-8, SK12-14, SK16, SK

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

EM A B C Interruption Requirements Interruption Zone No. of Days Peak Day GWh/Day EM A EM B 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

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 B NW C100.3 NW D202.5 Total7.27 GWh/Day NG LTS Interruption Zones & Interruption Requirements 2011/12 - North West (indicative)

East Anglia Actual Interruption - Days locational by postcode

East Midlands Actual Interruption - Days locational by postcode

North West Actual Interruption - Days locational by postcode

Actual Interruption days by LDZ Volume by postcode

Actual Interruption days by LDZ