An accolade is any form of praise, including simply saying, "You did a very good job of washing the car." Nonetheless, the word is generally reserved for something a little more formal; at the very least, to praise someone when several other people are present to hear it. And no, it's not a title. "The demand for..." is correct. It means that the demander wants or needs more solar energy. This is often used in the plural: "The demands for solar energy greatly exceed the capacity of today's technology to provide it."