Other than our confesseur, the mighty @marcelh also acts behind the scenes as our sustainability whisperer (the article about Litobox for example was sent by him - see Litobox - collective prefab heat pumps).
In his latest contribution he sent me a link to a shop where one can buy wind turbines for the roof. Possibly not something for right away, but probably a nice starting point the day somebody invents a subsidy for this kind of things.
https://tesup.com/be_nl/tesup-verticale-windturbines-voor-woningen.html