Altenmarkt Run-of-River Power Plant

VERBUND's Altenmarkt power plant is a run-of-river power plant situated on the Enns River and located in the municipality of Altenmarkt near St. Gallen in Styria.

Man in the kitchen

36,030 households

supplies the Altenmarkt power plant

Conscious of the environment

122,446 fewer
tonnes of CO2*

No fish bypass

Construction of a fish bypass 

under examination


Certified in accordance with ISO14001

* Quelle: ENTSO-E Erzeugung 2017

The run-of-river power plant was built between 1958 and 1960. In 1978, the power plant was automated and the control room converted to remote control. In 1999, the turbines and generators were replaced, a building for the emergency power generator built and the control room converted. Nowadays, the power plant generates 150 GWh of environmentally friendly electricity from 100% hydropower, with which it can supply almost 36,000 households.

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Image from the Location

Owner VERBUND Hydro Power GmbH
Operator VERBUND Hydro Power GmbH
Commissioning 1960
Type Run-of-river power plant
Country Austria
Region Styria
Waters Enns
Output 26 MW
Annual output 149,710 MWh
Turbine Kaplan
Connectivity Fish bypass is in the planning process
Ecology & environmental protection

Ecology & environmental protection

The construction of a fish bypass in Altenmarkt is currently being evaluated.
The entire plant group of the Styrian hydropower plants has been awarded the environmental certificate ISO 14001. The power plants on the rivers Mur and Enns not only fulfil the statutory requirements but also focus on high environmental standards and technical innovations. The goal is the efficient use of hydropower and the balance between economy and ecology. The effectiveness and benefit of the environmental management system are mainly the responsibility of our employees, who undergo constant training and development in this area.

Wherever ecologically valuable and technically feasible, VERBUND has set itself the goal of guaranteeing the continuity of flow for domestic fish and aquatic life at the locations of its hydropower plants. By 2025, VERBUND will invest 280 million euros on the implementation of fish bypasses and other ecological structural measures.

Our latest nature conservation projects
Turbines and generators: A vertically installed, six-blade Kaplan turbine in a sheet metal spiral achieves a nominal output of 25,700 kW at a nominal flow rate of 140 m³/sec. and a head of 20.5 metres. The directly coupled 30,000 kVA three-phase synchronous generator has a nominal voltage of 10.5 kV.

Transformers: The generated energy is raised from 10.5 kV to 110 kV by a 30,000 kVA machine transformer in the main power plant. The electricity is discharge via a 110 kV line to the Eßling substation of STEWEAG-STEG-GesmbH (SSG).