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H. Price, National Renewable ABSTRACT Arizona Public Service (APS) is required to generate a portion of its electricity from solar resources in order to satisfy its obligation under the Arizona Environmental Portfolio Standard (EPS). In recent years, APS has installed and operates over 4.5 MWe of fixed, tracking, and concentrating photovoltaic systems to help meet the solar portion of this obligation and to develop an understanding of which solar techn ologies provide the best cost and performance to meet utility needs. During FY04, APS began construction of a 1-MWe parabolic trough concentrating solar power plant. This plant represents the first parabolic trough plant to begin construction since 1991. The plant will also be the first commercial deployment of the Solargenix parabolic trough collector technology developed under contract to the National Renewable Energy Laboratory (NREL). The plant will use an organic Rankine cycle (ORC) power plant, provided by Ormat. The ORC power plant is much simpler than a conventional steam Rankine cycle power plant and allows unattended operation of the facility. 1. Objectives The primary objective ofthe parabolic trough ORC plant is to generate electricity to satisfy the APS solar obligation under the Arizona EPS. However, a secondary objective is to evaluate the cost and performance of this technology in comparison to the other solar technologies that APS is implementing. The DOE Solar Technology Program’s objective is to use this project to help baseline the cost and performance of the current generation of parabolic trough technology. 2. Technical Approach APS is a leader in the development and demonstration of new and emerging solar power technologies. APS has an extensive portfolio of fixed, tracking, and concentrating photovoltaic systems, which are currently operating in many locations across Arizona. The APS STAR facility is a world- class solar research facility dedicated to understanding how these technologies perform for utility and customer applications. APS also has an extensive history supporting the development of concentrating solar power (CSP) technologies. Recent advances in parabolic trough solar technology and organic Rankine power cycle technology have made the possibility of a small parabolic trough plant economically feasible. Because of this, APS decided to competitively procure a 1-MWe parabolic trough plant. APS Energy Laboratory, Golden, Colorado selected the team of Solargenix Energy, Inc., of Raleigh, North Carolina, and Ormat International of Reno, Nevada, to develop the plan t. Solargenix i s the system integrator and provider of the parabolic trough solar field and Ormat is the provider of the ORC power plant. APS has partnered with SunLab1 for technical support and to offer the project as a potential test bed for evaluation of parabolic trough technologies. The APS/SunLab team will use the plant to: • Assess the cost and performance of small megawatt- scale trough plants • Evaluate the first commercial deployment of the new Solargenix parabolic trough concentrator developed under a DOE cost-shared R&D contract • Evaluate the integra tion of a modern organ ic Rankine p o w e r c yc l e w i t h a p a r a b o l i c t r o u g h s o l a r f i e l d technology, • Demonstrate unattended operation of a commercial parabolic trough power plant, and • Demonstrate the cost, performance, and operating characteristics of a thermocline thermal energy storage system. 3. Results and Accomplishments In April 2002, APS issued a request for proposal for a 1- MWe parabolic trough plant. The Solargenix/Ormat team was selected and notified of award in August 2002. Construction began in June 2004 with grading of the site, installation of a security fence and installation of a water line from the existing Saguaro power plant. Construction of the solar field and installation of the power plant will begin in Fall 2004. Construction will be completed and initial operation should begin in Spring 2005. The plant is located next to the existing APS Saguaro power plant facility approximately 30 miles northwest of Tucson, Arizona. The plant will initially have 10,340 square meters of parabolic trough solar field supplied by Solargenix. The power plant will be nominally a 1-MWe organic Rankine cycle system with wet cooling supplied by Ormat. Table 1 shows the main design characteristics of the plant. Note that the plant is being designed with the possibility of being expanded at some point in the future. Table 1 shows design information and key metrics for parabolic trough technology from the multi-year technology plan for both the initial base and the expanded system designs. This is the first commercial parabolic trough power plant built by Solargenix Energy. However, Solargenix also plans to begin construction on a 50-MWe parabolic trough plant in 1 SunLab is a collaboration between NREL and Sandia National Laboratories in support of the U.S. DOE Solar Technology Programs work on concentrating solar power technologies. Parabolic Trough Organic Rankine Cycle Power Plant S. Canada, Arizona Public Service, Phoenix, Arizona (Scott.Canada@aps.com) G. Cohen and R. Cable, Solargenix Energy, Raleigh, North Carolina D. Brosseau, Sandia National Laboratories, Albuquerque, New Mexico 1PDF Image | Parabolic Trough Organic Rankine Cycle Solar Power Plant
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