Compared to other countries I've lived in, Belgium doesn't do too bad of a job in promoting 'green energy'. Although I've not lived there for some years, they used to subsidize things like solar panels on roofs (at least when my parents installed them 20-ish years ago). And there are 'green energy' companies as far as I'm aware, so you don't have to stick with the larger energy providers.

That said, my information is outdated.