1. Using the Trapezoidal Model to Derate NW Hydro Capacity Resource Adequacy Technical Committee July 25, 2007 Portland, Oregon

2. July 25, 2007Resource Adequacy Technical Committee Meeting 2 Caveats Results based on 2004 Biological Opinion without additional court-ordered spill Trapezoidal Model output is currently still under review Initial comparisons to HOSS indicate that the Trapezoidal Model capacity may be high Using the lowest quintile or 1937 hydro energy to assess the hydro derate may not be appropriate

3. July 25, 2007Resource Adequacy Technical Committee Meeting 3 December Hydro Capacity vs. Monthly Energy

4. July 25, 2007Resource Adequacy Technical Committee Meeting 4 January Hydro Capacity vs. Monthly Energy

5. July 25, 2007Resource Adequacy Technical Committee Meeting 5 July Hydro Capacity vs. Monthly Energy

6. July 25, 2007Resource Adequacy Technical Committee Meeting 6 August 1-15 Hydro Capacity vs. Monthly Energy

7. July 25, 2007Resource Adequacy Technical Committee Meeting 7 August 16-31 Hydro Capacity vs. Monthly Energy

8. July 25, 2007Resource Adequacy Technical Committee Meeting 8 Hydro Capacity Derate 1937Hydro Derate (MW) - Based on Lowest Quintile Hydro PeriodEnergy2-Hr4-Hr6-Hr8-Hr10-Hr12-Hr Sep95923890495563067806912310261 Oct10271346044525549690181389274 Nov11890439451145738656480688458 Dec11899433152486274718684239624 Jan96714544559166107806906010321 Feb91234904606371268536999411179 Mar99044883589671178551988410990 Apr 1104104957577867157896911310153 Apr 29521416549915842695781369171 May10834229627993260389046865482 Jun14630145219682428286333754109 Jul12955345140194501496756366369 Aug 112280366743894935549362296933 Aug 210679465654666247717079898818