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5-57 SL-5641 Final 5.8.3 Total Investment Cost The major cost contributors in total investment cost of a tower solar plant are the solar collector field (43%), receiver system (16%), and the power block (13%). In combination with thermal storage, increased annual net efficiency, and reduced equipment cost via technology advancements, competition and deployment are the primary elements in reducing the long-term cost of the tower plant. 5.8.3.1 Near Term (2004) The SunLab projected near-term total investment cost is $7,135/kWe as compared to S&L’s estimate of $8,209/kWe. The SunLab projected near-term total investment cost is based on (a) actual values from Solar Two, (b) detailed cost estimates done by industry, and (c) scaling projections and escalation done by SunLab. The basis for the near-term cost is as follows: • The capital cost of the heliostat estimated by SunLab is $145 per m2 as compared to the S&L estimate of $160. S&L reviewed several detailed cost estimates and developed a composite cost analysis. The detailed cost estimates used were developed by ADLittle (2001), Peerless- Winsmith (1989, 1996, 1999), Advanced Thermal Systems (1996), and Solar Kinetics (1996) for the 148-m2 heliostat. S&L evaluated each cost component associated with the manufacturing of heliostats. The largest cost components are the drive mechanisms, which are about 50% of the total cost. This cost is relativity accurate since there are detailed cost estimates from the manufacturer. The cost for the 95-m2 heliostat was then estimated based on a scaling factor of 0.80, which is more conservative than the industry standard of 0.7. • The receiver cost estimate is based on information provided by Boeing. Boeing is the supplier of the receiver for Solar Tres. The receiver cost estimate is based on actual costs from the Solar Two demonstration project, detailed design and material lists, and cost estimates by Boeing. • The SunLab cost estimate for near term is based on actual costs for Solar Two and vendor quotes obtained during the Central Receiver Utility Studies (1989), which was a 100-MWe plant. S&L reviewed the vendors’ quotes and validated that the component costs were within typical industry costs. • The near-term indirect two-tank thermal storage system is based on cost estimates from detailed design drawings and material takeoffs developed by Nextant. The technological risk using the two-tank molten-salt storage system is low based on the successful utilization at the Solar Two plant. • Sargent & Lundy estimated costs for the power block and balance of plant using the EPRI SOAPP program. The result was that the capital cost estimated by S&L for the electrical power block is less than the SunLab estimate ($563/kWe versus $730/kWe). The capital cost estimated by S&L for the balance of plant is higher than the SunLab estimate ($741/kWe versus $356/kWe). The SunLab power block cost estimates are based on a 1990 ABB quotation for aPDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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