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5. Economic Analysis Levelized energy costs were calculated for the plants with dry and wet cooling using the year-by-year cash flow analysis within Excelergy. The input financial parameters to the model are listed in Table 8. Table 8 Financial Parameters for Levelized Energy Cost Calculations Parameter Interest during construction - Construction period, years - Interest rate, percent Operation and maintenance cost, $ million - Dry cooling 1 - Wet cooling Cost of water, $/1000 gallons Effective income tax rate, percent Debt financing - Interest rate, percent - Period, years - Minimum coverage ratio - Nominal fraction of total investment, percent 2 Investment tax credit, percent Depreciation period, years Equity financing - Required return, percent - Nominal fraction of total investment, percent 2 Discount rate, percent - Nominal - Real Value 2 7 4.720 to 4.793 4.778 1.40 40.0 6 20 1.4 56 10 5 15 44 10.1 7.6 Task 2 Wet/Dry Heat Rejection Analysis Notes: 1) Varies with the size and capital cost of the air cooled condenser 2) Actual value varies by plant, based on debt coverage ratio, depreciation schedule, investment tax credit, and equity financing requirements The capital cost for the plant with wet cooling was developed from the default values in Excelergy. As a point of reference, the default estimate within Excelergy for ‘General Balance of Plant and Cooling’ was compared with an independent estimate of the wet heat rejection system from References 2 and 3. The results are shown in Table 9. - 19 -PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis
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