Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts

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Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts ( assessment-parabolic-trough-and-power-tower-solar-technology )

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D-40 SL-5641 Final The S&L O&M costs for comparison to the SunLab projections are based on the following: • Solar Field  The initial unit costs are based on the SunLab values, and cost reductions for years beyond 2004 are based on a PR = 0.92  Replacement rate for the mirrors and HCE are based on the average actual replacement rates for SEGS III – VII for the period 1997–2001  The replacement rates for the balance of the solar field are based on the SunLab values • Power Block and Balance of Plant  Costs are based on S&L data for the respective MW size plant for the steam turbine systems and balance of plant • Water and Process  Costs are based on are based on the average actual costs for SEGS III – VII for the period 1997–2001 • Staffing, Services Contracts, Miscellaneous, and Capital Equipment  The costs are based on the SunLab values since the SunLab values were determined to be reasonable • Thermal Storage  The costs are based on 0.4% of the capital cost per annum Analyzing the two estimates revealed that the major component to account for the cost difference is the HCE replacement rate. Table D-29 shows a comparison of the SunLab and S&L projected replacement rates. Table D-29 — Projected Trough Receiver Replacement Rates Annual Failures (Percent of Field) SunLab S&L Current 2004 2007 3.5% 2.0% 1% 5.5% 5.5% 2.5% 2010 2015 2020 0.5% 0.5% 0.5% 1.5% 1.0% 0.5% The SunLab near-term values are not consistent with the average actual HCE replacement rate of 5.5% reported for SEGS III – VII for the period 1997–2001. Sargent & Lundy reviewed the actual receiver (HCE) replacement rate reported by KJC Operating Company over the last five years. The S&L evaluation is based on total HCE replacement reported for the SEGS III – VII

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