How expensive is solar energy if I want to plant in in a single household?

Very few people actually know what they are talking about in this subject. Those who pretend they do are selling something you don't need. Go to the local library and ask the librarian where to find some information. Eventually you will figure out that solar energy is not at all what you thought it was.

Examples:
~ A solar clothes dryer is a rope.
~ Solar cooling is a tree.
~ Solar electricity costs more than it is worth, unless you live in the wilderness.