Perach Run-of-River Plant

VERBUND's power plant at Perach is a run-of-river plant situated on the river Inn above the Alz estuary in Bavaria.

Man in the kitchen

29,091 households 

supplies the Perach power plant

Conscious of the environment

98,863 fewer
tonnes of CO2*


Fish bypass available since 2017



Certified in accordance with ISO14001


Technical Description 

The Perach power plant was built from 1974 to 1977. It is the first pier power station on the river Inn, a structure, which was developed on the Drau and which is characterised by its lower construction costs and better removal of floating refuse. Furthermore, Perach was the first power plant to be conceived for fully-automated operation and to be monitored by the Töging control room from the start. It is made up of four weir openings and three turbine piers. Every turbine pier is equipped with a Kaplan turbine with horizontal shafts and a fitted generator. On average, the Perach power plant generates around 128 GWh of electricity per year. Furthermore, a fish ladder is currently also being planned.

Image from the Location

Owner VERBUND Innkraftwerke GmbH
Operator VERBUND Innkraftwerke GmbH
Commissioning 1977
Type Run-of-river power plant
Country Germany
Region Bavaria
Waters Inn
Output 19 MW
Annual output 128,400 MWh
Turbine Kaplan
Connectivity Fish bypass is in the planning process
Environmental protection at VERBUND

Ecology & environmental protection

Since 2017, the Perach run-of-river power plant has also been equipped with a fish bypass.

Each hydropower plant on the Inn comprises:

  • the machinery hall with the turbines,
  • the weir systems for flood release,
  • the dams and dikes for the accompanying flood protection
  • and – if inland drainage has been disrupted by the dams – the pumping stations and ditches, which guarantee agricultural use that existed before construction of the barrage. 

The VERBUND hydropower plants on the Inn are therefore not only plants for generating electricity but also improve flood protection in the region. VERBUND also focuses on improving the ecological conditions at individual sites and on restoring natural river landscapes. We implement a large number of measures in this regard, such as:

creating continuity of flow with fish bypasses,
giving structure to bodies of water,
connecting tributaries. 
In order to guarantee habitats for fish with all their habitat requirements – from spawn to adult specimens – management of the gravel banks is additionally carried out in the near-natural fish bypass or below the weir. Another important component for the long-term conservation of fish fauna is the maintenance of sediment continuity through sediment management, a topic of the EU Water Framework Directive (WFD) for species conservation in man-made rivers.

Our latest conservation projects

Technical data:

Owner: VERBUND Innkraftwerke GmbH
Operating company: VERBUND Innkraftwerke GmbH
Beginning of operation: 1977
Type: Run-of-river
Country, State: Germany, Bavaria
Water bodies: Inn
Capacity: 19.4 MW
Annual generation: 128,400 MWh
Turbines: Kaplan (3)
Fish bypass: in the planning process