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The calculation of the levelized cost for each geothermal generation plant relied on four key assumptions about the operation of the plant, which are consistent with the assumptions used in the financial model. Table 9.6 presents each of these assumptions. Table 9.6 Assumptions for Calculating the Levelized Cost of Geothermal Projects Variable Assumption Capacity factor Useful life Cost of capital Operations and maintenance cost per kWh Capex 85 percent 40 years 10 percent US$0.01 for Dominica Phase 2 US$0.02 for all others Dominica 1 US$67 million Dominica 2 US$531 million Grenada US$82.3 million Nevis US$78.1 million Saint Kitts US$136.3 million Saint Lucia US$168.3million Saint Vincent US$96.3 million Notes: The operations and maintenance cost per kWh is lower for Dominica Phase 2 because of the size of the geothermal generation plant. The Capex includes costs for T&D and access roads. The differences in the levelized costs of geothermal generation are the result of differences in the: • Size of the geothermal generation plant— The size of the geothermal plant affects the levelized cost in two ways. First, larger geothermal plants have higher total capital costs. However, larger plants generate more electricity, which can lead to a lower levelized cost. The impact of the size of the plant on the levelized cost will depend on which of these two effects has a larger impact. • Additional capital investment required to build the geothermal generation plant—Projects that are in a later stage of development will require lower capital costs and, as a result, have lower levelized costs. It is important to note that the levelized costs that we calculated for each project only include the operations and maintenance costs, the financing costs, and the additional capital • costs required to complete the geothermal investments. Since there were no estimates available for the investments already made for each of these projects, we were not able to include the previous investments in our analysis of levelized costs. Ideally, the levelized costs should include the full capital costs of the project so that technologies and projects can be more accurately compared. If additional information on previous and expected investments required is provided, we will refine this analysis in the next report. Operations and maintenance costs— The fixed operations and maintenance costs per kWh can change based on the size of the plant. We assumed that the operations and maintenance costs for Dominica Phase 2 is US$0.01 per kWh because of the size of the plant. This is lower than the fixed operations and maintenance costs that we assumed for the other plants, which was US$0.02 per kWh. 68PDF Image | Unlocking Geothermal Power Eastern Caribbean Powerhouse
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