- Cowlitz PUD

Figure 22Rank Ordered Fixed O&M Assumptions$300.00$250.00$200.00$/MWh$150.00$100.00HighMedLow$50.00$-CT CCCT Wind PulverizedCoalIGCC Nuclear Geothermal Solar Biomass Landfill GasFigure 23 shows the final assumptions used in the IRP analysis. Due to theuncertainty surrounding these costs the study treated fixed O&M costs as astochastic variable. The data points from Figure 23 were used to parameterizeprobability distributions in the simulation.Figure 23Fixed O&M Assumptions Used in StudyLow Med HighWind $ 11.30 $ 20.79 $ 29.78Geothermal $ 22.60 $ 86.09 $ 132.00Biomass $ 71.80 $ 82.27 $ 92.74Landfill Gas $ 125.00 $ 131.32 $ 134.97Solar $ 34.55 $ 44.72 $ 54.89Pulverized Coal $ 17.10 $ 26.60 $ 43.19IGCC $ 22.62 $ 33.37 $ 48.59CCCT $ 8.76 $ 9.80 $ 11.29CT $ 5.25 $ 6.95 $ 8.64Nuclear $ 43.19 $ 72.83 $ 109.72Variable O&M CostsVariable operations and maintenance costs are incurred when the plant isrunning. The principle component variable O&M for most plants is fuel cost.Variable O&M also includes emissions costs, variable fuel transportationcharges, as well as water or anything else consumed in the generation process. 44 Wood Mackenzie, http://www.woodmacresearch.com/cgi-bin/wmprod/portal/energy/highlights39