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Hydroelectricity Run of the River
Run of the River (Damless Hydro) 

While not entirely without ecological side effects, Run of the River type hydroelectricity plants offer an alternative to large flooding reservoirs. In these installations, only a portion of the river is diverted to the generators and the rest of the river is left to flow naturally. This requires a river with a very constant flow rate since there is very little storage capacity. While conventional hydro facilities can generate in the 10,000MW capacity and above, Run of the River type plants typically are limited to around a 1,000MW range.