BULL$HIT!
Once the electricity is on the grid, you cannot tell if it came from a windmill or a dirt burner. "Renewables" are such a small part of the overall production and so unreliable, that most of the time you are consuming electricity made from "non-renewable" sources. Wind/solar also complicate grid voltage stability, which means the coal/gas/nuke plants have to ramp up the MVARs they generate to keep grid voltage and frequency stable. Small distributed generators cannot do this