A renewable energy source mostly touted is wind energy generated by wind turbines. This source of energy can only be used to generate electricity and hence can only be used by power companies. Some power companies are so big and have so much generating capacity that they can utilize this source of energy. But the bottom line is that this source of energy, wind energy, is intermittent and can not be used as a base load. Also more transmission lines are required and as this article points out, who pays for this?
So wind energy, without government tax breaks and subsidies, probably would not be economically viable and can only be used by very large Power Companies if the economics make sense.