High Quality Content by WIKIPEDIA articles! Run-of-the-river hydroelectricity (ROR) is a type of hydroelectric generation whereby a considerably smaller water storage called pondage or none is used to supply a power station. Run-of-the-river power plants are classified as with or without pondage. A plant without pondage has no storage and is, therefore, subjected to seasonal river flows and serves as a peaking power plant while a plant with pondage can regulate water flow and serve either as a peaking or base load power plant.