OSM Page:
We don't know if they are generators or not so we tag them
as windmills.
HB: looking in the data it seems this layer covers both power generation and small windmills on farms (for pumping water?). The linz windmill_use attribute is given in the data dictionary but doesn't actually exist much in the data. Lacking info we'll have to rely on local mappers to fix any power generating ones by hand.