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Overhead roof crane introduction:
Hydro power plants use dams to produce hydroelectricity by impounding a reservoir of water and then releasing it through one or more water turbines. The turbines are connected to generators that generate electricity from the energy provided by the difference in the water level upstream and downstream.link:http://www.chinacranemanufacturer.com/overhead-crane/double-girder-overhead-crane/hydropower-station-dual-hook-lifting-overhead.html