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Solar Energy Technologies Program

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Solar Energy Technologies Program ( solar-energy-technologies-program )

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Figure 2-4. Concentrating PV (point-focus Fresnel lens) 2.4.2 Concentrating Solar Power Systems Concentrating solar power systems concentrate the thermal energy of the sun to drive a heat engine. The heat engine then drives a generator to produce electricity. Line-Focus Parabolic Troughs Parabolic troughs use single-axis tracking mirrors to focus sunlight onto a glass-jacketed, tubular receiver containing a heat-transfer fluid, such as synthetic oil. The heated oil passes through a heat exchanger to generate steam that then drives a turbine generator. Nine plants, ranging in size from 13 to 80 MW, were installed between 1984 and 1990 in California. Most of these plants are hybrid power plants, with the capability to be dispatched to meet intermediate loads by providing up to 25% of the thermal input to the power block using natural gas to supplement the solar-thermal energy. These plants continue to operate and provide power to the electricity grid. Plans for two power plants in the United States have been announced recently. A solar-only, 50-MW power plant is to be built in Nevada, and a 1-MW power plant using an organic Rankine- cycle power block is to be built in Arizona. Other projects are pending in Spain, Israel, and, using Global Environmental Facility funds,19 in several developing countries. 19Status of GEF Projects: www.gefweb.org/Map/orgp_2000-12.pdf- The Global Environment Facility (GEF) is a financial mechanism that provides grant and concessional funds to recipient countries for projects and activities that aim to protect the global environment. GEF resources are available for projects and other activities that address climate change, biological diversity, international waters, and depletion of the ozone layer. Countries can obtain GEF funds if they are eligible to borrow from the World Bank IBRD and/or IDA) or receive technical assistance grants from UNDP through a country program. Solar Energy Technologies Program Multi-Year Technical Plan 25

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