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Assessment of the Costs of Geothermal Power Generation in New Zealand 6.6.2 Power Plant O&M Costs Geothermal power plants typically incur annual O&M costs in the range of about 50 to 100 NZD.kW-1. At this level total O&M costs are up to about 1 NZ cent.kWh-1. The following table gives an estimated breakdown for power plant O&M costs in the size range of 20 to 50 MW as considered in this study. These values have been used directly in the financial modelling undertaken in Section 8. Although the variable costs in Table 6-7 are expressed in NZD.kWh-1(gross), they are applied in the modelling to the net kWh. Table 6-7 Nominal Breakdown of Geothermal Power Plant O&M Costs Gross Capacity Factor % 95% 95% Gross Capacity MWe 20 50 Gross Generation kW.yr‐1 166,440,000 416,100,000 Fixed Costs Labour & Mngt NZD.yr‐1 $ 1,250,000 $ 1,800,000 Variable Costs Materials NZD.yr‐1 $ 50,000 $ 150,000 Planned Maintenance (major overhauls) Cycle period yr 2 2 Labour per cycle $ 200,000 $ 300,000 Materials per cycle $ 50,000 $ 125,000 Unplanned Maintenance Labour NZD.yr‐1 $ 50,000 $ 75,000 Materials NZD.yr‐1 $ 100,000 $ 200,000 Fixed Costs NZD.yr‐1 $ 1,250,000 $ 1,800,000 NZD.kWe‐1 $ 60 $ 40 Variable Costs NZD.yr‐1 $ 325,000 $ 637,500 NZD.kWh‐1 $ 0.0020 $ 0.0015 Total Power Plant expressed as NZD.yr‐1 $ 1,575,000 $ 2,437,500 O&M Costs expressed as NZD.kWh‐1 $ 0.010 $ 0.006 expressed as NZD.kWe‐1 $ 80 $ 50 Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 34PDF Image | Current Costs of Geothermal Power Generation in New Zealand
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