A wind turbine
A windmill or wind turbine was a large propeller used to convert wind into energy.
The 22nd century trellium mining facility on a planet used wind turbines on its surface to create energy. (ENT: "The Xindi")
In his conversation with Fleet Admiral Kirsten Clancy about the planned Romulan attack on Coppelius in 2399, retired Admiral Jean-Luc Picard said that the windmills had become giants. (PIC: "Broken Pieces")
Although not specified on screen, Picard's metaphor was presumably a reference to the 17th century novel Don Quijote by Miguel de Cervantes.
In an early script version of Star Trek: First Contact, the city Resurrection City was surrounded by nearly a hundred windmills of various levels of advancement.
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