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

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

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

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

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

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

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

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 Sep Oct Nov Dec Jan Feb Mar Apr Apr May Jun Jul Aug Aug