I can find no definition of "green energy" anywhere, but then, expressions used in toothpaste commercials do not necessarily get into the dictionary. Let us see what we can do to clarify things a bit.

Roughly speaking, Ontario’s sinful Darlington station could be replaced by about 3000 very large and virtuous windmills, each 130 metres to the blade top and weighing 30 tonnes or so, larger than those illustrated in the June issue of the Canadian Geographical Society Magazine. They would need to be spaced out over about 1500 square kilometres of land, say in a 10 km wide swathe from Toronto to Georgian Bay. Would they be green? At night, at least, the 9000 aircraft obstruction lights weaving through the night sky as far as the eye could see would be red, not green. The expression "green energy" does not only reveal ignorance and muddled thinking. It’s worse than that; it is just plain silly.

In plain English, "CO2-free energy" would be ordinary good sense, but do the people concerned want good sense, which might confuse their arguments?.