Obervogau Run-of-River Power Plant

VERBUND's power plant at Obervogau is a run-of-river plant situated on the river Mur and in the municipality of Obervogau in Styria.

The Obervogau run-of-river power plant was built between 1974 and 1977. Four Kaplan turbines generate an annual average of around 59 GWh of electricity and can therefore supply about 13,300 households with electricity produced entirely from hydropower.

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Owner	VERBUND Hydro Power GmbH
Operator	VERBUND Hydro Power GmbH
Commissioning	1978
Type	Run-of-river power plant
Country	Austria
Region	Styria
Waters	Mur
Output	13 MW
Annual output	59,419 MWh
Turbine	Kaplan
Connectivity	Fish bypass

Ecology & environmental protection

Since 2013, the fish at the location of the Obervogau run-of-river power plant have enjoyed the use of the fish bypass that guides them from the tailrace to the headrace. It consists of a raw bed channel with a basin-type structure in the entrance area, followed by a near-natural bypass channel and a vertical slot pass at the exit. In total, the fish bypass has a length of around 2.4 km and overcomes a height difference of 7.9 metres.

Fish bypasses for the diversity of species

Turbines and generators: Two Kaplan turbines with a diameter of 4.15 metres have a nominal output of 6,500 kW each. The two three-phase synchronous generators have a rated output of 10,000 kVA at a nominal voltage of 6.3 kV.

Transformers: The 20,000 kVA machine transformer raises the generated energy to 110 kV before it is conducted via a tie-in to the line to the Leibnitz substation of STEWEAG.

Weir system: The three-field weir system consists of welded pressure segment gates with flaps; the segments are hydraulically controlled by two pull cylinders and the flaps by a central push cylinder.