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Assessment of the Costs of Geothermal Power Generation in New Zealand 7. Assessed Capital Costs for Development Scenarios 7.1 Development Costs Based on the cost data given in Section 6, capital costs have been estimated for the geothermal developments given in the various scenarios presented earlier and these are presented in Tables 7.2 (for high envelope well options) and Table 7.3 ( for low envelope well flow options). Some of these data are presented graphically in Figure 7.1 (resource temperature versus capital costs for each development scenario) and Figure 7.2 (resource temperature versus specific capital costs for each development scenario). A zero decommissioning value has been assumed for the purposes of this study – this has negligible net impact on the model outputs at the end a 30 year life. Table 7.1 gives a summary of the capital cost data for each development option, filtered on the basis of mean capital cost. Table 7-1 Summary Capital Cost Data Capital Cost NZD M Specific Capital Cost NZD.kW‐1 # 1,17 5,21 9,25 2,18 10,26 6,22 13,29 14,30 3,19 4,20 7,23 11,27 12,28 15,31 8,24 16,32 Cycle MW SF 50 DF 50 Hybrid 50 SF 50 Hybrid 50 DF 50 ORC 50 ORC 50 SF 20 SF 20 DF 20 Hybrid 20 Hybrid 20 ORC 20 DF 20 ORC 20 oC High Low Env Env Mean ± High Low Mean ± Env Env 300 171 205 188 9% 300 188 209 198 5% 300 187 222 204 9% 260 186 243 215 13% 260 197 248 222 12% 260 203 250 227 10% 300 223 259 241 7% 260 233 285 259 10% 260 97 118 107 10% 230 97 127 112 14% 260 105 121 113 7% 260 105 125 115 9% 230 105 128 117 10% 260 107 133 120 11% 230 105 136 121 13% 230 107 133 120 11% 3,400 4,100 3,800 4,200 3,700 4,400 3,700 4,900 3,900 5,000 4,100 5,000 4,500 5,200 4,700 5,700 4,800 5,900 4,800 6,300 5,300 6,000 5,300 6,300 5,300 6,400 5,400 6,600 5,300 6,800 5,400 6,600 3,750 9% 4,000 5% 4,050 9% 4,300 14% 4,450 12% 4,550 10% 4,850 7% 5,200 10% 5,350 10% 5,550 14% 5,650 6% 5,800 9% 5,850 9% 6,000 10% 6,050 12% 6,000 10% Table sorted on mean specific capital cost From these data and figures, plant options can be ranked on the basis of mean capital costs as follows: Sinclair Knight Merz. SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 40PDF Image | Current Costs of Geothermal Power Generation in New Zealand
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