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D.7 POWER BLOCK D.7.1 Direct Capital Cost The SunLab projected power block costs are shown in Table D-22. Table D-22 — SunLab Projected Power Block and Balance of Plant Costs D-30 SL-5641 Final Plant size, gross electric, MWe Power Block, $/kWe Balance of Plant, $/kWe Total, $/kWe SEGS VI 2004 2007 33 110 110 410 349 349 248 203 203 658 552 552 2010 2015 2020 165 220 440 293 256 197 171 149 115 464 405 312 There are multiple suppliers for the power block equipment, and costs will be market-driven. While a trough plant will benefit from competitive prices, power block cost reductions due to commercialization were not considered in this evaluation. D.7.2 Technology Improvements The power block is a conventional Rankine-cycle steam turbine. The Rankine-cycle steam turbine is an established technology with future major improvements focusing on increased inlet steam pressure and temperature conditions to increase the cycle efficiency. D.7.3 Scale-Up There are recognized scale-up cost reductions for the power block. Using the SOAPP software program, S&L estimated the scale-up factor for increasing the plant size from 100 MW to 400 MW, as depicted on Figure D-4. The projected SunLab values are included for comparative purposes. Power block costs (Figure D-4A) include the steam turbine and generator, steam turbine and generator auxiliaries, feedwater and condensate systems. Balance-of-plant costs (Figure D-4B) include general balance-of-plant equipment, condenser and cooling tower system, water treatment system, fire protection, piping, compressed air systems, closed cooling water system, plant control system, electrical equipment, and cranes and hoists.PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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