The Thurnsdorf run-of-river power plant is located south of the town of Enns, on the border between Upper Austria and Lower Austria.
Since its efficiency upgrade in 2016, the hydroelectric power plant has been able to supply two-thirds of the households in the nearby town of Enns with green electricity.
Since the modernisation, young fish can once again thrive in the diverse aquatic habitats of the Enns. Thanks to the implementation of a fish migration aid and the adjustment of the residual water flow, fish and small organisms can swim from the lower to the upper reaches of the river and reproduce in the newly created, valuable gravel spawning grounds and shallow water zones.
Owner: Ennskraftwerke AG
Operator: Ennskraftwerke AG
Commissioning: 1965
Type: Run-of-river power plant
Country: Austria
Region: Lower Austria
Waters: Enns
Output: 03 MW
Annual output: 15,300 MWh
Turbine: Kaplan
Connectivity: Fish bypass
The Thurnsdorf power plant is equipped with 2 Kaplan turbines and has an output of 2.9 MW. The expansion flow rate is 19 m³/s and the expansion head is 10.6 metres.
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The system is designed as a modular fish pass. It consists of a berm-like underwater ramp with tailwater access parallel to the turbine current, a technical shallow passage, a natural pass and a technical vertical slot pass with feed structure on the upstream side. In addition to providing continuity, this type of construction also creates important habitat elements for river systems such as spawning grounds, juvenile fish habitats and valuable habitats for microorganisms. The total length of the fish ladder (technical sections and natural pass) is approx. 1,325 metres, the maximum difference in height to be overcome is approx. 10.5 metres.
As part of the 2016 conversion measures, the residual water volume of the diverted stretch was also increased in order to ensure year-round continuity for all aquatic organisms.
