1. Safety Monitor - Winter Reviews Transmission Workstream 5 th July 2007 Chris Logue

2. Aims  Improve transparency of Safety Monitor process  Improve understanding of safety monitors and the need for them  Improve dialogue with industry – may result in better information being received

3. Monthly Review  From October 07  Review each of the underlying assumptions that sit behind the safety monitor calculation  Provide brief commentary against each assumption  Adjust monitor levels where appropriate  Publish on website – during the first week of each month  Discuss at the Operational Forum as necessary  This does not replace existing right/responsibility to change monitors throughout year in response to events.

4. Safety Monitors 2007/08 2007/8 Safety Monitor supply assumptions (mcm/d) UKCS227 Norway70 IUK35 BBL25 LNG imports33 Supply risk allowance-20 Total370 Supply Assumptions

5. Safety Monitors 2007/08  Preliminary View Storage typeAssumed storage capacity (GWh) Safety Monitor Requirement (GWh) Safety Monitor Requirement Long duration storage (Rough) 3444511893.50% Medium duration storage (MRS) 823300 Short duration storage (LNG) 193900 Total 4461711892.70%