- Cowlitz PUD

Figure 24Survey of Variable Operational and Maintenance (O&M) CostsIdaho Seattle NWPPC Avista PGE Pacificorp Low Med HighWind $ 1.16 $ 1.00 $ 1.15 $ 1.08$ 1.00 $ 1.10 $ 1.16Geothermal $ 1.80 $ 2.90$ 26.70 $ 5.50 $ 1.80 $ 9.23 $ 26.70Biomass $ 10.43$ 6.90 $ 1.91 $ 1.91 $ 6.41 $ 10.43Landfill Gas $ 1.00 $ 1.00 $ 1.08$ 1.00 $ 1.03 $ 1.08Solar $ -$ - $ -$ - $ - $ -Pulverized Coal $ 2.58 $ 3.24 $ 2.00 $ 1.89 $ 2.20$ 1.89 $ 2.38 $ 3.24IGCC $ 2.68 $ 3.24 $ 1.80 $ 1.62 $ 5.20 $ 1.10 $ 1.10 $ 2.61 $ 5.20CCCT $ 3.25 $ 2.85$ 2.30 $ 2.32 $ 2.30 $ 2.68 $ 3.25CT $ 4.64 $ 6.00 $ 8.00 $ 8.64 $ 4.50 $ 9.87 $ 4.50 $ 6.94 $ 9.87Nuclear $ 0.49$ 1.00 $ 1.08$ 0.38 $ 0.38 $ 0.74 $ 1.08Figure 25 below graphically summarizes the data from Figure 24 and shows theaverage as well as high and low values from the survey.Figure 25Rank Ordered Variable O&M Assumptions$30.00$25.00$20.00$/MWh$15.00$10.00HighMedLow$5.00$-Solar Nuclear Landfill Gas Wind PulverizedCoalIGCC CCCT Biomass CT GeothermalFigure 26 shows the final assumptions used in the IRP analysis. Due to theuncertainty surrounding these costs the study treated variable O&M costs as astochastic variable. The data points from Figure 26 were used to parameterizeprobability distributions in the simulation.Figure 26Variable O&M Assumptions Used in StudyLow Med HighWind $ 1.08 $ 1.12 $ 1.16Geothermal $ 1.80 $ 3.65 $ 5.50Biomass $ 6.90 $ 8.67 $ 10.43Landfill Gas $ 1.00 $ 1.03 $ 1.08Solar $ - $ - $ -Pulverized Coal $ 1.89 $ 2.22 $ 2.58IGCC $ 1.62 $ 3.17 $ 5.20CCCT $ 2.30 $ 2.62 $ 3.25CT $ 6.00 $ 8.13 $ 9.87Nuclear $ 0.38 $ 0.65 $ 1.0840