Chapter 4 Geothermal Energy

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Chapter 4 Geothermal Energy ( chapter-4-geothermal-energy )

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First Order Draft Contribution to Special Report Renewable Energy Sources (SRREN) 1 investment (LCCI) corresponds to the cost of the initial capital investment (i.e. site exploration and 2 development & power plant construction) and its related financial costs, divided by the total output 3 of the facility throughout the entire payback period (typically 20-30 years). Operating and 4 maintenance (O&M) costs consist of fixed and variable costs directly related to the electricity 5 production phase. Operation and Maintenance costs include field operation (labour), well work- 6 over, equipment, well operation, and facility maintenance, etc., and are currently ranged between 7 170 and 210 US$/kWh per year 8 9. 10 For geothermal plants, an additional factor must be added to these O&M costs, which is the cost of 11 reposition or make-up wells, i.e. new wells to replace some of the older whose lifetime is over. 12 Companies usually consider make-up drilling as a capital expense, but must be regarded as O&M 13 costs since the purpose of make-up drilling is to maintain the full production capacity of the power 14 plants (Hance, 2005). Costs of these wells are typically lower than those for the original wells, and 15 their success rate is typically higher. 16 In most cases, the LCCI represents a major part (about 65%) of the levelized cost of energy (LCOE) 17 of geothermal projects. 18 Current LCOE (i.e., including LCCI and O&M costs) in 2005 US$/kWh for some of the typical 19 geothermal-electric plants described in Table 4.7 were calculated according to the methodology 20 described in Chapter 1, using the version 6 of the calculator developed by Verbruggen and Nyboer 21 (2009), and are presented in Figure 4.9. In all cases the project lifetime was calculated to be 30 22 years and the capacity factor (plant performance) was 77%. For greenfield projects it was estimated 23 that the plant starts to operate between the beginning of the fourth and the sixth year since 24 exploration starts, and for expansion projects the plant is commissioned by the third year. 25 There are important variations depending on the discount rate used, yet in general terms the LCOE 26 for conventional plants in high temperature fields is lower than for binary cycle plants in low to 27 intermediate temperature fields. LCOE for expansion projects is also lower than for new projects 28 and the larger the project (in MWe) the lower LCOE, as clearly indicated by case 3, which is an 29 actual project currently operating in Mexico. The LCOE for case 5, calculated with data from a low- 30 temperature European project presented by GEOFAR (2009), is the highest and may be an 31 appropriate estimate for the theoretical LCOE for EGS projects. (equivalent to 152 and 187 US$/kWh per year at 2005 US dollar, respectively, according to the Current Consumer Price Index released by the US Bureau Labour Statistics) [TSU: consistent use of tools provided on TSU website to adjust for inflation/deflation?] Do Not Cite or Quote 31 of 47 Chapter 4 SRREN_Draft1_Ch04_Version03 22-Dec-09

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