Which city receives more solar radiation, Fargo or Louisville? (Answer: On average, Fargo receives more solar radiation than Louisville.) Knowing the answer to this question is important if you are looking to install solar panels. The National Renewable Energy Laboratory has compiled 30 years of data to create an atlas illustrating how much energy different regions of the U.S. can expect to generate from the installation of solar panels. Using their online form, users can see maps of average, minimum and maximum solar radiation on an annual- or month-specific basis. This atlas is definitely a resource to consult before starting a solar panel installation on your home.