Windmills were structures that turned to the wind.
Wholeweal's heat pump was powered by electricity generated by a windmill. (TV: The Green Death)
The Moulin Rouge had a red windmill on its roof. (PROSE: Enter Wildthyme)
Nardole once blew up a windmill on a colony ship after asking if it was important. (TV: The Doctor Falls)
Other references[]
The Eighth Doctor used to sing a song about windmills to Miranda Dawkins. (PROSE: Grimm Reality)
Windmill was the call sign of several UNIT helicopters including Windmill 11, (TV: The Day of the Doctor) Windmill 123, (TV: Doctor Who and the Silurians) and Windmill 347. (TV: The Mind of Evil)