Klaus Run-of-River Power Plant

VERBUND's power plant at Klaus is a run-of-river plant on the Steyr and situated in the municipalities of Molln and Klaus in Upper Austria.

*Source: ENTSO-E Production 2017

The Klaus power plant was built between 1973 and 1975. Apart from its main task of electricity generation, the storage reservoir also serves to reduce peak flows during floods. Two Kaplan turbines generate an annual average of around 74 GWh of electricity.
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Owner Ennskraftwerke AG
Operator Ennskraftwerke AG
Commissioning 1975
Type Run-of-river power plant
Country Austria
Region Upper Austria
Waters Enns, Steyr
Output 20 MW
Annual output 74,000 MWh
Turbine Kaplan
Connectivity No fish bypass
Environmental protection at VERBUND

Ecology & environmental protection

A fish bypass for the Großraming site is currently being evaluated. A feasibility study of ecological measures (German only) on the Enns was carried out in 2017 by the University of Natural Resources and Life Sciences Vienna (commissioned by: Office of the Provincial Government of Upper Austria, Office of the Provincial Government of Styria, Ennskraftwerke AG and VERBUND Hydro Power GmbH).
Responsible treatment of the environment
The Klaus power plant consists of a barrier and a powerhouse. A tunnel transports the water to the powerhouse where it is used to generate electricity.

Klaus storage reservoir: The total capacity of the 7.1 km-long reservoir holds 12.6 million m³ at a final level of 463.00 metres above sea level. The flood water retention capacity at dam levels of 457.00 to 466.00 metres above sea level is 7.8 million m³. The main feeders of the reservoir are the waters of the Steyr, Steyrling and Teichl. The barrier dams the Steyr to a height of about 40 metres. A flood water forecasting system uses rainfall data to generate a forecast about the inflow to follow in the next four hours and the necessary outflow is calculated accordingly.

Barrier structure: The curved wall of the Klaus dam is 55 metres high and has an average foundation depth of 10 metres. Numerous measuring devices have been installed on the dam for monitoring purposes. The values are regularly observed and sent to the powerhouse. Since the year 2000, the power plants on the Enns have been controlled from the control room in Steyr.