Figure XI-8.- Terrestrial solar thermal power cost for 5-GW power tower concept. 2. The highest cost component in the SPS concepts investigated is the solar cell blankets, comprising up to 81 percent of the SPS capital cost. Figure XI-10 shows this relationship together with the relative cost contribution of the other components. 3. DDT&E costs represent a substantial investment (up to $50 billion); however, when this cost is amortized over the 30-year implementation period (112 power stations), the amortization cost is only 2 percent of the COE. 4. SPS O&M costs are 2 to 7 milIs/kWh, which do not appear excessive based on initial estimates. 5. Concept 3 (truss structure, LEO construction, electric COTV) results in the lowest cost design; however, further analysis is required because of the very preliminary nature of this study.
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