Kallnach power station, Run-of-river power station in Kallnach, Switzerland.

Kallnach power station sits along the Aare River and uses a run-of-river system that taps the river's natural flow to generate electricity. The facility contains technical components that were developed and improved over many decades.

Construction took place from 1909 to 1913, marking an important step in the region's early hydroelectric development. Major upgrades between 1978 and 1980 increased its capacity for decades to come.

The station is listed as a cultural property of cantonal significance. Its 1913 machine house held six double Francis turbines from Piccard, Pictet & Cie in Geneva, with generators and transformers by BBC; the building's two towers carried the high-voltage cables out. The replacement of 1980 kept the original headrace tunnel and the three-kilometre tailrace canal.

The plant lies in Kallnach in the canton of Bern, with the water intake at the Niederriedsee reservoir and the tailrace canal running through the Grosse Moos to Walperswil. The site is an operating industrial facility owned by BKW Energie, so the machine house and canals are not open to casual visitors; viewing is from public paths.

The 1913 plant ran until 14 November 1978; its six Francis turbines were then replaced by a single pit turbine in an underground powerhouse, in service since 1980. The old headrace tunnel and the three-kilometre tailrace canal through the Grosse Moos were reused unchanged. The canal still keeps the groundwater level of the Grosse Moos up, which is why it could not simply be abandoned.