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ES-11 SL-5641 Final • The efficiency projections by S&L were based on a review of the SunLab Reference Case, demonstrated efficiencies, design modifications based on lessons learned from Solar Two, and turbine generator computer model. The main differences are the following: Mirror reflectivity efficiency was not increased beyond the demonstrated value of 95%. Increase would require advanced glass or other reflective membranes. Mirror cleanliness efficiency was not increased beyond the demonstrated value of 95%. Increase would require new materials and significant enhancements in cleaning equipment and methods. Near-term efficiencies were based on the ABB-Brown Boveri heat balance for SEGS IX. The efficiency for other size units was verified by using the General Electric STGPer software program. Efficiency has a direct impact on the size of the collector field. The increase in collector field area and corresponding increase in capital cost was calculated based on the lower efficiency estimated by S&L. • S&L estimate of the O&M costs is higher than SunLab for the following reasons: S&L scaled-up the cost of field and vehicle maintenance to account for the increase in field size. S&L assumed that the average burdened rate would not decrease between Solar 100 and Solar 220. Raw water cost used by S&L is based on actual cost reports at SEGS of $0.00122 per gallon ($0.32 per m3). SunLab estimated the cost to be $0.021 per m3), which is about 15 times less than the S&L estimate. S&L included a 10% contingency. Tower Technology Cost Sensitivity Variations in the inputs for levelized energy costs were calculated to illustrate the sensitivity to variations. S&L Base Case for 2020 Financial Incentives Impact of Eliminating 5-year MACRS Impact of Eliminating 10% Investment Tax Credit (ITC) Replacing ITC with Production Tax Credit of 1.8¢/kWh LEC $0.0547/kWh $0.0614 $0.0590 $0.0410 Variation 12.3% 7.8% -30.5%PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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