Solar energy is used, space heating of building, dry agricultural product and generating electrical energy. What is solar energy? Solar energy comes from the sun. The radiation of the sun is captured in solar panels that are exposed to sun light. The cost of the solar is 16 to 25 cents. I think is the less information because it is about coal I will do a demonstration coal is one of our most valuable natural recourses. Coal is our most abundant and lowest cost fuel. For making electricity. New technology is making it cleaner.