NDLI: Net Energy Analysis for Concentrated Solar Power Plants in Chile

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Escobar, Rodrigo Larrai´n, Teresita
Copyright Year	2008
Abstract	The Chilean Energy Policy calls for 15 percent of new power generation capacity to come from renewable energy sources from 2006 to 2010, and then a 5% of electric energy generated from renewable energy sources with gradual increases in order to reach 10% by 2024. Concentrated solar power is an interesting alternative to help achieving those objectives, as it is estimated that northern Chile has high radiation levels, coupled with high values of the local clearness index and availability of flat terrain. The present report investigates the net energy attributes of parabolic trough plants installed in the Atacama Desert. Monthly means of solar radiation are used in order to estimate the solar fraction for a 100 MW plant at three different locations. Our analysis considers three cases: operation during sunlight hours only, with and without fossil fuel back-up, and continuous operation during 24 hours a day. The net energy analysis for concentrated solar power (CSP) plants is then performed, considering the energy costs of manufacturing, transport, installation, operation and decommissioning. The results indicate that the CSP plants are a net energy source when operating in sunlight-only mode and that the energy payback time is a linear function of the total operation time when utilizing fossil fuel back-up. In the continuous operation mode, the CSP plants become fossil fuel plants with solar assistance, and therefore all locations display negative net energy. Based on this result, the back-up fraction required for the plants to be net energy sources is estimated from the EROEI as function of the back-up fraction. It is estimated that the net energy analysis is a useful tool for determining under which conditions a CSP plant becomes a net energy source, and thus can be utilized in order to define geographical locations and operation conditions where they can be considered renewable energy sources.
Starting Page	31
Ending Page	41
Page Count	11
File Format	PDF
ISBN	9780791848692
DOI	10.1115/IMECE2008-67481
e-ISBN	9780791838402
Volume Number	Volume 8: Energy Systems: Analysis, Thermodynamics and Sustainability; Sustainable Products and Processes
Conference Proceedings	ASME 2008 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2008-10-31
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Fossil fuels Energy policy Parabolic troughs Nuclear decommissioning Renewable energy sources Energy resources Radiation (physics) Concentrating solar power Solar energy Sunlight Energy generation Manufacturing Solar radiation
Content Type	Text
Resource Type	Article

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