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Smaller power plants, such as a one-megawatt plant, were estimated to have a higher first cost, about $9 to 10 million, with the same first-of-a-kind engineering and startup costs. Even at the comparatively high first cost, with low interest, long term loans the annual component of these costs is acceptable for power displacing retail pricing. There were several challenges related to O&M costs. The current SEGS plants have an O&M composite cost range of about $0.05 to 0.07 a kWh. Being much smaller, a STORES power plant would have a much higher O&M cost if it used the same staffing. If the plant fully was automated, it would have no regular staffing at all. A special effort was dedicated to examining this notion. The effort included operators, engineers and managers from a SEGS facility. After much debate, each of the skeptics was convinced that automated STORES plants were feasible, even desirable. A remote display and control station would be available offsite, at a manned local substation or other control room. This remote control could be transferred to any computer set up to manage the power plant. This automation would probably result in operation slightly less optimal than manned operation, and therefore cost a few kilowatt-hours in output each day. However, the automation would save a lot of money in reduced labor costs, particularly for the smaller STORES power plants, more than offsetting the lost production and related revenue. The estimated O&M costs are about $0.05 a kWh. Conclusion and Recommendations STORES power plants offer a new pathway towards commercialization of solar trough power plants. Instead of moving to larger power plants or plants that are integrated with natural gas, STORES plants would stand alone, providing electricity for customers who need it most. Rather than benefit from economies of scale, STORES plants would benefit from economies of production and modularity. STORES plants would provide power where possible at retail rates that are two to three times wholesale rates. Where feasible, STORES plants could use storage, although in the Southwestern U.S. this was not found to be of value. It may be vital, however, in developing countries, such as in the Sahara or Middle East. ixPDF Image | Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics
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