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ES-6 SL-5641 Final The lower S&L solar-to-electric efficiency requires a larger solar field to compensate. The S&L case assume an 11% increase in solar field. The S&L case assumes a lower deployment 2.8 GWe by 2020 verses the SunLab deployment assumption of 4.8 GWe. As a result, less production-based learning was assumed. Cost estimates for steam turbines and balance-of-plant costs were estimated by S&L using the EPRI SOAPP model, compared to S&L’s internal cost database, and adjusted for labor and productivity rates in the southwestern states. The S&L estimates for steam turbines were less than SunLab. The S&L estimates for balance-of-plant costs were comparable to SunLab. S&L estimated that the engineering, management, and development to be 15% of the capital cost as compared to SunLab estimate of 7.8%. • Sargent & Lundy’s 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 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. Trough Technology Cost Sensitivity Variations in the inputs for levelized energy costs were calculated to illustrate the sensitivity to variations. LEC $0.0621/kWh $0.0698 $0.067 7.8% Variation Sargent & Lundy 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 Project Cost Increasing Cost of Equity by 1% Increasing Construction Period to 2 Years Increase in Capital Cost by 10% Increase in Annual O&M Cost by 20% 12.5% $0.049 -26.9% $0.0668 7.7% $0.0655 5.5% $0.0675 8.8% $0.0635 2.3%PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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