A Pathway for Sustained Commercial Development and Deployment of Parabolic Trough Technology

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A Pathway for Sustained Commercial Development and Deployment of Parabolic Trough Technology ( a-pathway-sustained-commercial-development-and-deployment-pa )

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Parabolic-Trough Technology Roadmap January 1999 means that the conventional part of the steam plant also received the property tax exemption because it was necessary for solar operation. This may give an unfair tax advantage to the solar plant and thereby penalizes the local government that operates on the income from property taxes. Future efforts may be better served by only asking for the property tax exemption on the "fuel" portion of the solar plant, and not including the conventional system. This approach simplifies the issue, especially when considering large hybrid systems that have small solar contributions. ÿ Sales Tax Exemption This exemption is similar to the property tax exemption. Because fossil fuels do not pay sales taxes, solar equipment should be exempted from sales tax. Paying sales tax on the solar property is comparable to a fossil plant having to pay sales tax on a 30-year fuel supply up front, while the plant is under construction. A property tax exemption on solar equipment would allow solar technologies to compete with fossil technologies. RESOURCE ASSESSMENT Access to high-quality direct normal insolation (DNI) data is essential for deploying parabolic- trough plants. Generally, there is either no measured solar resource data or only limited data available for most promising international locations. The desired format and accuracy of the DNI data depends on the stage of a project's development. For scoping studies, which look at the feasibility of a technology in a specific region, maps that show average daily DNI totals for each month and on an annual basis (+/-15% accuracy) are probably sufficient. For prefeasibility studies, hourly DNI data sets (+/-10% accuracy) are necessary. For feasibility and design studies, hourly or smaller time increment data (+/-5%) are needed, with some accounting for potential inter- annual variability. ÿ High-Resolution DNI Maps and Data NREL's Renewable Energy Resources group has generated a number of DNI and cloud cover maps for many promising locations (see Figure 14). These maps have proven to be very valuable to industry. This effort should be expanded to complete DNI maps for all promising regions and to utilize new higher-resolution satellite data to increase spatial and temporal resolution of the maps. ÿ Meteorological Data Generator Given the limited ground measurement data available and the time required for collecting a representative data set (7–10 years), it is desirable to have the ability to create an hourly DNI data set for any given location. The same data used to generate the DNI maps could be used to create hourly data sets. ÿ Standard Meteorological Site Instrumentation In most cases, it will be desirable to install some form of DNI, temperature, and wind measurement instrumentation at a site to verify the meteorological data prior to installation of a plant. Standardized designs, equipment, procedures, and Quality and Assurance processes should be developed and used. Page 32

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