VERBUND's Rosegg-St. Jakob plant is a run-of-river power plant situated on the Drava River, south of the town of Rosegg in Carinthia.
The Drava, Carinthia’s lifeline, meanders from west to east through the province’s valleys. Carinthia, rich in water with its beautiful lakes and numerous rivers, offers ideal conditions for the generation of environmentally friendly electricity. The run-of-river power station Rosegg-St. Jakob is located in the middle of the Carinthian section, south of the village of Rosegg.
Since 2014, the run-of-river power plant has had the longest technical fish bypass in Carinthia, which has also been awarded the “Habitat Water Label” by the water department of the province of Carinthia.
Owner: VERBUND Hydro Power GmbH
Operator: VERBUND Hydro Power GmbH
Commissioning: 1974
Type : Run-of-river power plant
Country: Austria
Region: Carinthia
Waters: Drava
Output: 80 MW
Annual output: 335,123 MWh
Turbine: Kaplan
Connectivity: Fish bypass
Turbines and generators: Two vertical Kaplan turbines achieve of rated output of 43 MW each with an impeller diameter of 5.0 metres and four-bladed turbine impellers. The two three-phase synchronous generators have a rated output of 47,000 kVA.
Transformers: The generated electricity is raised to 110 kV by two 47,000 kVA main transformers and conducted away via the adjacent open-air switchgear.
Pumping stations: The water in the reservoir area is managed by pumping stations in Föderlach, St. Niklas and Dragnitz.
The Rosegg-St. Jakob run-of-river power plant was built between 1969 and 1974 with the financial involvement of KELAG.
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Fish bypass
Over a length of 500 metres, the fish bypass connects the watercourse of the natural Drava in the area of the St. Martin weir with the 16.9 metre-higher headwater channel of the power plant, and is a technical and ecological masterpiece as the longest technical bypass in Carinthia. It consists of a total of 130 pools and 17 resting and spawning zones. Special slots in the pools keep the movement of the water constant and direct the current in an S-shape. This corresponds to the pressure behaviour of natural waters.
The bypass is designed for the species of fish that can be found in this section of the Drava. One of the most important of these is the Danube salmon, which, with a length of up to one metre, is the species that determines the size of the project. Brown trout, common nase and barbel also use the ladder to reach their spawning habitats. The subsoil in the fish ladder is also a valuable habitat for microorganisms such as larvae and fish feeders – which is why experts often speak of a migration corridor.
