page_title: Aller (Germany)
section_title: Water power
hierarchical_section_title: Aller (Germany) / Water power
caption_attribution_description: Deutsch: Das Wasserkraftwerk Oldau in der Aller
context_page_description: The Aller is a 215-kilometre long river in the states of Saxony-Anhalt and Lower Saxony in Germany. It is a right-hand, and hence eastern, tributary of the Weser and is also its largest tributary. Its last 117 kilometres form the Lower Aller federal waterway. The Aller was extensively straightened, widened and, in places, dyked, during the 1960s to provide flood control of the river. In a 20-kilometre long section near Gifhorn, the river meanders in its natural river bed.
context_section_description: In upgrading the Aller between Celle and the mouth of the Leine near Schwarmstedt between 1908 and 1918, hydropower stations were built at two of the four new barrages: Oldau and Marklendorf. They enabled the electrification of the Südheide. The Oldau station, with three Francis turbines, was taken over in 1929 by PreussenElektra. In 1972, the power stations were closed as they were unprofitable. Whilst the structure in Marklendorf was demolished, the power station in Oldau was declared a technological monument and escaped destruction. After being modernised in 1983, it rejoined the grid. It has largely been preserved in its original state. Here, the water power of the Aller, with the aid of Francis turbines with a nominal power of 650 kW, is used to generate 3 million kWh per year of electric current.
caption: Oldau waterworks
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