Flat, flex, assured pressures Network Development Statement 2007 bookings timeline Demand forecasts Network analysis Flat, flex, assured pressures Network Development Statement Open 01 Jun Application window Close 24 Jul Initial 15 Sept Revised allocation Final 30 Sept w/e 18 May 25 May 08 Jun 15 Jun 22 Jun 29 Jun 06 Jul 13 20 27 03 Aug 10 Aug 17 Aug 24 Aug 31 Aug 07 Sept 14 Sept 21 Sept 28 Sept 05 Oct NB Assumes implementation of Mod 139

2008 bookings timeline DN internal activities Demand forecasts Network analysis Optimisation Network development statement Transitional period activities Flat, flex and assured offtake pressures Y+1 to Y+3 Flat, flex and assured offtake pressure applications Allocation Enduring period activities Assured offtake pressures Y+4 to Y+6 NTS reduction applications DN response DN increase applications DN Interruption Y+4 to Y+8 Interruptible tenders Interruptible allocations Prevailing rights Initial rights Decrease/ increase applications Annual flex Y+4 and Y+5 Annual flex auctions and allocations Annual flat (not needed in 2008) Annual flat auctions and allocations NTS system management tenders ???? Month Apr May Jun Jul Aug Sep