What are the objectives of solar energy?

You need to learn what the words mean.

Only people have objectives.

Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a wavelength of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. Anybody who uses the word in any other context does not know what he is talking about.

"Solar" means sunshine. Solar heating is standing in the sunshine. Solar cooling is standing in the shade. A solar clothes dryer is a rope. People get really really silly about this stuff because they have no idea what they are talking about. A certain university spent hundreds of thousands of dollars studying solar heating and cooling for several years and finally concluded "The most important thing we have learned is that the sun rises in the east and sets in the west." A city in California considered that and ordered all construction contractors to build all houses with the long dimension lying east-west, resulting in a noticeable reduction in utility costs for those houses.