Hydroelectric power stations

facility generating electric power using hydroelectricity

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thumb|Dassault Super Mystère showing entry to engine intake duct

thumb|Penstocks at the Ōhakuri Dam, New Zealand A penstock is a sluice or gate or intake structure that controls water flow, or an enclosed pipe that delivers water to hydro turbines and sewerage systems. The term is of Scots origin, and was inherited from the earlier technology of mill ponds and watermills, with penstocks diverting pond waters to drive the mills.