Gralla Run-of-River Power Plant

The Gralla run of river plant is a power plant on the river Mur and is located in the vicinity of Leibnitz in Southern Styria just bevor the Mur flows into Slovenia.

At the Gralla power plant, turbines and generators were dismantled and modernised after more than 40 years of operation. This has increased the efficiency of the power plant’s machinery and increased electricity generation by about five percent. With the modernised turbines and generators, the Gralla power plant on the Mur can now cover the annual electricity requirements of around 19,000 households.
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Owner VERBUND Hydro Power GmbH
Operator VERBUND Hydro Power GmbH
Commissioning 1964
Type Run-of-river power plant
Country Austria
Region Styria
Waters Mur
Output 15 MW
Annual output 71,884 MWh
Turbine Kaplan
Connectivity Fish bypass
Environmental protection at VERBUND

Ecology & environmental protection

The reservoir of the Gralla power plant has developed into a paradise for water birds. At the power plant’s own observation station, various species of ducks, swans and herons as well as widely travelled Nile geese from Africa can be watched. 
Since 2013, the Gralla power plant has also been equipped with a fish bypass. It was designed as a vertical slot pass and overcomes a height difference of 9.4 metres. The total length of the fish bypass is 354 metres. The dimensions of the fish bypass were chosen to suit the pike. The fish in the Mur can now swim around the power plant through 72 basins (12 of which are resting basins).
Responsible treatment of the environment

Turbines and generators: The powerhouse is equipped with two vertically installed machine sets, each consisting of a Kaplan turbine with a rated output of 7,700 kW and a three-phase synchronous generator with a rated output of 11,000 kVA. 
Weir: The weir fields are equipped with segment closures with top flaps.