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Solar Assessing the Potential for Renewable Energy on Public Lands Resource Data NREL has developed a national solar resource assessment for the United States at a resolution of approximately 40 km by 40 km. The data are updated periodically; the most recent update was in the summer of 2001 and represents 14 collector configurations. The CSP analysis utilized direct normal data, which represent concentrating systems that track the sun throughout the day, such as trough collectors or dishes. The PV analysis used data from the flat-plate collector type, typical for a PV panel oriented due south at an angle from horizontal equal to the latitude of the location of the collector. The data were developed from the Climatological Solar Radiation (CSR) Model, developed by NREL for DOE. This model uses information on cloud cover, atmospheric water vapor and trace gases, and the amount of aerosols in the atmosphere to calculate the monthly average daily total insolation (sun and sky) falling on a horizontal surface. Where possible, existing ground measurement stations were used to validate the model. Nevertheless, uncertainty is associated with the meteorological input to the model, since some of the input parameters are not available at a 40 km resolution. As a result, the modeled values are believed to be accurate to approximately 10% of a true measured value within the grid cell. Because of terrain effects and other microclimate influences, local cloud cover can vary significantly even within a single grid cell. Furthermore, the uncertainty of the modeled estimates increases with distance from reliable measurement sources and with the complexity of the terrain. Concentrating solar collectors are much more sensitive to solar resource characteristics than flat-plate collectors, so these sources of uncertainty are more important to concentrator applications. Wind A compilation of data from many different sources was used in this analysis. Updated resource assessments of Idaho, Montana, Oregon, and Washington were produced by TrueWind Solutions in 2000 and 2001. The assessments were produced using the Mesomap system and historical weather data, and were validated with available surface data by NREL and wind energy meteorological consultants. The accuracy of the updated wind resource assessment is generally within 20% for wind power density for 80% of the areas. For more information, see http://www.windpowermaps.org. An updated assessment of Colorado was produced in 1995 for the Colorado Governor’s Office of Energy Conservation “Study to Identify and Characterize Sites for Utility Wind Farm Development in Colorado.” This study was conducted by Michael Brower of RLA Consulting in Bothell, WA. The data are available from the Colorado Renewable Resource Database (http://www.coloradoenergy.org/corrd). The resolution of the data is 1 x 1 km, and the 1987 U.S. wind resource assessment was used as a base. These data have not been validated by NREL. An updated assessment of New Mexico was produced by Brower & Co., Inc., for the New Mexico Energy, Minerals and Natural Resources Department in 1996. The original data produced for the assessment were for 50-m wind speeds. The resolution of the data is 1 x 1 km, and the 1987 U.S. wind resource assessment was used as a base. These data have not been validated by NREL. The data were converted to 50-m wind power density using elevation as a proxy for air density, assuming a wind distribution Weibull k = 2.0. B2PDF Image | Assessing The Potential For Renewable Energy On Public Lands
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