Ering-Frauenstein Run-of-River Power Plant

The river Inn forms the border between Austria and Germany over a long distance. But hydropower plants can be connectors, such as the Ering-Frauenstein power plant, which builds a bridge for pedestrians between Bavaria and the Austrian Innviertel region.

Man in the kitchen

97,546 households

supplies the Ering-Frauenstein power plant

Conscious of the environment

325,847 avoided
tonnes of CO2*

Technical Description 

The Ering-Frauenstein power plant was built between 1938 and 1943. At the time it was the first power plant in the Lower Inn area; that is the area between the Salzach estuary and Passau. Three vertically built-in Kaplan turbines generate an average yearly output of 438 GWh. The publically accessible weir bridge was renovated in the years 2002 to 2003.

Image from the Location

Owner VERBUND Hydro Power GmbH, Innwerk AG
Operator Grenzkraftwerke GmbH
Commissioning 1943
Type Run-of-river power plant
Country Austria
Region Upper Austria
Waters Inn
Output 73 MW
Annual output 434,000 MWh
Turbine Kaplan
Connectivity Fish bypass is in the planning process
Environmental protection at VERBUND

Ecology & environmental protection

In the storage area of the power plant, there are large open areas and the bird sanctuary (Lower Inn European Nature Reserve).
The power plant does not yet have a fish bypass, but this should change by 2019. As part of the power plant’s modernisation, a bypass channel for the fish in the Inn is also to be constructed. The fish bypass will be carried out on a ramp, which will be heaped up against the Eringer dam, and will have the typical character of a flowing watercourse. It should reach a length of 2.6 km. It will also overcome a height difference of 10 metres. 
At the same time as the fish bypass is set up, the dam root will also be structured. Floodplain habitats typical of the Inn, with an island side arm system, flat banks and old course structures, are in focus. The aim is to create more spawning grounds for fish and habitats for juvenile fish.
The ecological upgrade of stream landscapes with a green infrastructure is creating healthier ecosystems with greater species diversity and new habitats for these species. These four stream landscapes are the Große Kößlbach, the confluence of the Saagbach with the Danube, the Simbach and the polder area of the Weitbach and the Westerndorfer Graben. This project is funded by the European Region under the INTERREG V-A Programme Austria–Bavaria 2014–2020.  
Responsible treatment of the environment

Technical data:

Owner: VERBUND Hydro Power GmbH (50%), Innwerk AG (50%)
Operating company:
Grenzkraftwerke GmbH    
Beginning of operation: 1943
Type:  Run-of-river
Country, State Germany, Bavaria
Austria, Upper Austria
Waters: Inn
Capacity: 72,5 MW
Annual generation: 434.000 MWh
Turbines: Kaplan (3)
Fish bypass: in the planning process