If they are providing "green energy" into the grid, are they doing it for free or is there some kind of financial consideration for them? If so.. are they ac

If they are providing "green energy" into the grid, are they doing it for free or is there some kind of financial consideration for them? If so.. are they actually being charged _more_ than others who simply use power from the grid, or are they receiving an entirely different class of service all together?