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system has demonstrated a peak, instantaneous, net solar-to-electric conversion efficiency of nearly 30% and an average annual conversion efficiency of 22%. Dish/Stirling Reference System The 2006 technology baseline is a unique, hand-built prototype 25-kW dish/Stirling system that is part of a 1-MW (40-dish system) power plant with the following characteristics: • Glass-metal solar concentrator design • Net annual solar-to-electric generation efficiency of 22% • Kinematic Stirling engine • High O&M costs ($0.10/kWh) resulting from prototype operation • Solar-only system operation • Demonstrated annual availability of about 80% • Installed system costs of about $8600/kW • LCOE of 0.49/kWh (based on current prototype costs) 3.2.6 CSP Technical (Non-Market) Challenges/Barriers and Goals Although parabolic trough and dish/Stirling systems have similar functional components—e.g., concentrator structure, focusing mirrors, receivers, and thermal-to-electric power conversion blocks—the technical challenges differ due to differences in commercial maturity, operational scale, and the ability to include thermal storage. The key technical challenges for parabolic trough technology relate to improving the efficiency and reducing the installed capital cost of the solar field, including the concentrator and solar receiver. To take advantage of the added value for firm, dispatchable power, an additional challenge is to develop a low-cost and thermally efficient energy-storage system that can dispatch power to meet system peak load. The cost of parabolic trough systems also benefits from scaling up plant size and the learning that results from volume production. Figure 3.2.6-1 shows the results of an independent analysis that identified the relative importance of these factors in reducing the cost of the parabolic trough technology. 66PDF Image | Concentrating Solar Power
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