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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Executive Summary Preamble The National Renewable Energy Lab awarded SUBCONTRACT NO. NAA-1-30441-05 to Reflective Energies as a result of its competitive solicitation to find pathways to solar thermal power. The subcontract was to perform a study that would further develop the concept of the Solar Trough Organic Rankine Cycle Electricity System (STORES) through a Stage 1 Study. The objectives of the proposed work are as follows: 1) develop an optimized ORC power cycle for integration with a parabolic trough solar field, 2) develop a conceptual design and cost estimate for a 10 MWe STORES system, 3) conduct a performance and economic assessment of pilot and mature STORES plants, 4) conduct preliminary assessment of STORES market potential, and 5) identify next steps towards a demonstration or early commercial STORES project. Background Solar Trough Power Plants began very successfully, with nine plants and a total of 354 megawatts on line within a few years in the late 1980s. These plants (known as SEGS1 Plants I through IX) have performed very well over the last twenty years, generating power all year, but especially during the peak summer months. Their expected life is at lease thirty to forty years. They have generated far more power than all other solar technologies combined. Their longevity has also exceeded most other solar. Sadly, despite this success, no more plants have been built since then. A New Proposition for Solar Trough Power Plants: Smaller is Better This study investigated a new pathway towards commercialization of solar trough power plants, a system dubbed STORES (Solar Thermal Organic Rankine Electricity System). The prevailing wisdom was that in order to be economic and successful, solar trough projects had to be larger, or integrated with natural gas plants, creating economies of scale. This study examined the opposite proposition. It postulated that a large solar 1 Solar Electric Generator v

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