Flumenthal power plant

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Flumenthal power plant
Aerial view from 1994 looking towards the northwest of the power plant.  The forest planted in the foreground stands over the former Aare river bed.
Aerial view from 1994 looking towards the northwest of the power plant. The forest planted in the foreground stands over the former Aare river bed.
Flumenthal power plant (Canton of Solothurn)
Flumenthal power plant
Coordinates 611.46 thousand  /  230916 coordinates: 47 ° 13 '45 "  N , 7 ° 35' 24"  O ; CH1903:  six hundred and eleven thousand four hundred and sixty  /  230916
country SwitzerlandSwitzerland Switzerland
Canton of SolothurnCanton of Solothurn Solothurn
place Riedholz SO
Waters Aare
Height upstream 426.7  m above sea level M.
power plant
owner Alpiq : 62.1%
BKW Energie : 37.9%
Start of operation 1970
Bottleneck performance 27 megawatts
height of fall
8.5 m
Expansion flow 350 m³ / s
Standard work capacity 146 million kWh / year
Turbines 3 × bulb turbines
Website Alpiq
was standing 2018

The Flumenthal power station is a low-pressure - hydropower plant on the river Aare in the canton of Solothurn in Switzerland . Although the power plant bears the name of the municipality of Flumenthal , it is located in the neighboring municipality of Riedholz SO .


As part of the second Jura water correction , the bed of the Aare between Büren a. A. and Flumenthal expanded and the Flumenthal power plant built to regulate the water level of the Aare between Lake Biel and Solothurn , thus protecting the region from flooding. Since part of the damming came to lie in the area of ​​the canton of Bern , BKW Energie had 37.9% right to use the facility, and the canton of Solothurn 62.1%. The rights of use for Solothurn were initially exercised by Aare-Tessin Aktiengesellschaft für Elektrizität (Atel), which merged with Alpiq Holding in 2009.

The power plant was built in an excavation north of the Aare, and after the construction work was finished, the river was diverted so that it flowed through the weir with the power plant. Operations began in 1970, and in 1979 a system for removing flotsam was added. Between 2006 and 2009, the power plant was modernized for 30 million francs and production increased by 6%. This was made possible by installing larger turbine wheels and increasing the flow cross-section.


The power plant consists of a weir system with three 12.5 m wide openings and the machine house with the three bulb turbines . By using this type of turbine, the building is very low and therefore less noticeable in the landscape. The first turbines each had an output of 7.8 MW. During the renovation, they were replaced by those with an output of 9 MW each.


Web links

Commons : Kraftwerk Flumenthal  - collection of images

Individual evidence

  1. Flumenthal power station. Aarestrom, accessed on April 27, 2019 .
  2. Numbers & facts about production. BKW Energie, 2019 .;
  3. a b Flumenthal run-of-river power station. Alpiq;
  4. Flumenthal river power station produces additional electricity for 1,750 households. Alpiq, August 19, 2009 .;
  5. Federal Office for Water Management (Ed.): Statistics of hydropower plants in Switzerland . January 1, 1973 (Appendix No. 274).