Altenmarkt Run-of-River Power Plant

The VERBUND power plant Altenmarkt is a run-of-river power plant on the Enns and situated in the municipality of Altenmarkt near St. Gallen in Styria. The run-of-river power plant was constructed between 1958 and 1960, automated in 1978 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 systems converted. Nowadays, the power plant generates 150 GWh of environmentally friendly electricity from 100% hydropower.

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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

Ecology & environmental protection

The newly built fish pass was put into operation in 2022. The fish traverse the difference in elevation of more than 20 metres via a total of 93 ponds.
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 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).