geothermal power plant projects in central america - Orkustofnun

Table 11 shows a summary of costs for scenario 1 (SF, 300 kg/s, 240°C) calculated as explained inprevious sections. The capital costs estimated according to this methodology for a different geothermalresource (mass flow and temperature) and different power plant technology will be used as input in thefinancial modeling in Section 6. Figure 32 illustrates the breakdown of the total capital cost ofgeothermal development for scenario1. This includes all the costs associated with total investmentwhere the plant cost is approximately 50%, the drilling cost is 27%, exploration and confirmationcosts total 8%, the power line transmission cost is 8% and the steam gathering system cost is 7%.TABLE 11: Estimated cost of geothermal power plant developmentfor single-flash scenario 1 (27.7 MW): 300 kg/s and 240°CCategorySub-CategoryNominal ValueValueUnitsExploration 173 USD/kwExplorationConfirmation 173 USD/kwTotal Exploration 346 USD/kwKnown Field 504 USD/kwDrillingUnknown Field 1,047 USD/kwTotal Drilling 1,047 USD/kwSteam Gathering 279 USD/kwPower PlantEquipment and Costruction 1,964 USD/kwTransmission Power Line 840,000 USD/kmTotal Power Plant 2,546 USD/kwO&M Total O&M 2.8 USD¢/kwh5.6.1 Capital cost of single-flash power plantFigure 33 shows the specific capital cost (SCC) of SF in USD/kW for exploration and confirmation,drilling and power plant as a function of the resource temperature for different mass flows. The SCCdecreases as the resource temperature increases from 160 to 340°C. SCC for SF power plants varies4,000Plant (300 kg/s) Plant (600 kg/s) Plant (1000 kg/s)Drilling (300 kg/s) Drilling (600 kg/s) Drilling (1000 kg/s)Expl. & Conf.Specific Capital Cost [USD/kW]3,5003,0002,5002,0001,5001,0005000160 180 200 220 240 260 280 300 320 340Resource temperature [°C]FIGURE 33: Specific capital cost of geothermal development for SF power plant37