Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics

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Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics ( solar-trough-organic-rankine-electricity-system-stores-stage )

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The next effort was to find grid-connected customers with large loads who were concerned about electric reliability and who were paying high prices for electricity. These customers also required large, flat land areas and high quality direct normal solar radiation. Several potential customers were found. Among them are US military bases, National Forests and Parks, and Native American lands. Many of these entities expressed a strong interest in STORES power plants of the size proposed, where the power would offset their grid usage, saving the most power at peak summer prices. The key considerations were dependable power, long term price stability and reasonable costs. With the stellar track record of the SEGS power plants, these considerations could be satisfied. An alternative approach was to look for customers who were required to meet renewable energy portfolio thresholds. One electric utility (APS) interested in meeting its portfolio standards through solar was very interested in the STORES technology. APS met several times with Reflective Energies, and even visited a geothermal power plant at Reflective Energies’ request. Subsequently, APS issued an RFP for a one-megawatt STORES power plant. Three bidders were selected, three bids received, from which one was chosen. That power plant, known as the Saguaro Power Plant in Arizona, is now under construction. APS will consider several more such plants as it ramps up to meet its renewable portfolio requirements. Other customers are expected to follow. STORES has indeed gone from concept to reality, as envisioned in the proposal. Cost Considerations The capital and O&M costs for STORES power plants were examined. It was estimated that the first plant would cost an estimated $5,000 a kW, or about $27,500,000 for a five megawatt plant with an additional $2,500,000 for first-of-a-kind engineering and startup of the first plant. Each subsequent plant would drop in cost by an estimated 3 to 5 percent, as experience and increased production favorably impact costs. viii

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