joost schouppe
This is one of very many "windmills" that were imported four years ago. However, this is NOT a wind generator (generator:source=wind), but an oldschool man_made=windmill
See http://mielenkiinnonkohteita.blogspot.com/2010/07/liperin-museo.html
It seems there are also a lot of water pumping windmills in the imported dataset, as well as small installations (which can be filtered out from industrial scale generators with generator:output:electricity=small_installation
All the windmills in Finland will probably have to be reviewed to turn this into useful data...