From Halopedia, the Halo wiki
Zanzibar Municipal Turbine 7 is a wind turbine in EAP's Wind Power Station 7 on Zanzibar Island on Earth. It generates electricity by harnessing the power of wind using a massive wind wheel and a generator located inside an adjoining power facility. Traxus Heavy Industries and Buelterman Carney Cotton & Hayward Inc. were involved in the construction or management of the turbine.
The turbine's wind wheel.
The generator complex inside the power facility.
A sign identifying the power facility.