Retznei Run-of-River Power Plant

VERBUND's Retznei power plant is a run-of-river plant situated on the river Sulm and in the municipality of Retznei in Styria.

Technical Description

 The Retznei run-of-river plant was built from 1991 to 1992 and was co-financed by Lafarge. After just ten months of construction, the plant went into operation in June. For the creation of the stilling basin, a pilot project by the Technical University of Graz was carried out. The double-regulated axial flow Kaplan turbine with a bevel gear and the direct-coupled three-phase current synchronous generator annually produce around 4 GWh of power.

In January 2015, the prototype for a new fish ladder by the company Hydroconnect was installed in Retznei. The transportation of fish takes place via two interlocking screws, which convey fish both upwards and downwards by means of the counter-rotating winding mechanism. The "Albrecht Fish Lift" guarantees the safe passage of fish and aquatic organisms whilst simultaneously generating electricity, whereas the required water volume remains energetically unexploited in conventional fish ladders.

Technical data:

Owner: VERBUND Hydro Power GmbH
Operating company: VERBUND Hydro Power GmbH
Beginning of operation: 1992
Type:  Run-of-river
Country, State: Austria, Styria
Waters: Sulm
Capacity: 0,9 MW
Annual generation: 3.847,8 MWh
Turbines: Kaplan 
Fish bypass: yes