Grossraming Run-of-River Power Plant

VERBUND’s Grossraming power plant is a run-of-river power plant on the Enns, situated in the municipality of Reichraming in Upper Austria.

The Großraming power plant was built in several stages between 1945 and 1951. Until 2000, the power plants at Schönau, Weyer and Losenstein were also controlled from Großraming – the central control room is now in Steyr. The power plant’s two sets of machinery were completely renewed between 2001 and 2003. Two Kaplan turbines with a directly coupled three-phase synchronous generator generate an annual average of approx. 270 GWh of electricity.

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Owner Ennskraftwerke AG
Operator Ennskraftwerke AG
Commissioning 1950
Type Run-of-river power plant
Country Austria
Region Upper Austria
Waters Enns
Output 72 MW
Annual output 270,700 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
Turbines and generators: Two sets of machinery from the years 2002 and 2003, each comprising a vertically arranged Kaplan turbine with a nominal output of 35.55 MW and a directly coupled three-phase synchronous generator with a nominal output of 38 MVA. A Francis turbine with an expansion output of 515 kW and coupled with a 700 kVA generator serves as an in-house machine.

Transformers: Each of the two main transformers has an output of 31,500 kVA and a transformation ratio of 6.3/115 kV.

Weir system: Each weir is equipped with two underguards (ground outlets) and a weir gate. In the stilling basin, six 4 metre-high, armoured interfering bodies for energy destruction are installed in each half of the weir. A water flow rate of 3,500 m³/sec can be discharged through the weir system by releasing all the closure openings, while maintaining the final level.