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Economic, Energy, and Environmental Benefits of Concentrating Solar Power in California

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Economic, Energy, and Environmental Benefits of Concentrating Solar Power in California ( economic-energy-and-environmental-benefits-concentrating-sol )

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NREL CA Solar Benefits Appendix A A.1.1 SEGS Plants Figure A-1 Photo of Parabolic Trough System (Source: NREL) The largest collection of parabolic systems in the world is the Solar Energy Generating Systems (SEGS) I through IX plants in the Mohave Desert in southern California. The SEGS plants were built in the 1985 to 1991 time frame. Figure A-2 shows the Kramer Junction site with five 30 MW SEGS plants. The largest of the SEGS plants, SEGS IX, located at Harper Lake, is 80 MW. All of the SEGS plants are “hybrids,” using fossil fuel to supplement the solar output during periods of low solar radiation. Each plant is allowed to generate 25 percent of its energy annually using fossil fuel. With the use of the fossil hybrid capability, the SEGS plants, during Southern California Edison (SCE) on-peak hours, have exceeded 100 percent capacity factor for more than a decade, with greater than 85 percent from solar operation. In general, the SEGS plants are operating well. Operation and maintenance (O&M) costs have dropped sharply over time, coincident with performance gains. Although component reliability has generally been good, there have been issues. Modifications have been made to improve the lifetimes of mirrors and receivers. New models of HCEs from current suppliers appear to perform better than the original HCEs, with evidence of significantly reduced failure rates. The availability of spare parts was April 21, 2006 A-4

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