Direct Normal (DNI) solar radiation (kWh/m2/day) for the Southwestern
USA, showing the most suitable areas for large-scale Concentrated Solar
Power (CSP) development. Data was filtered to exclude areas off-limits
to development, lands with slopes >5%, and areas with <5
kWh/m2/day solar power prospects. More information can be found at
http://www.nrel.gov/csp/modeling_analysis.html