St. Martin Storage Power Plant

VERBUND's St. Martin power plant is a storage power plant situated in the municipality of St. Martin am Wöllmissberg in Styria.

The Hierzmann annual storage was built between 1947 and 1950 and made a big improvement to the storage capacity of the Teigitsch group. The St. Martin cavern power plant has a bottleneck capacity of 9,800 kW and was put into operation in 1965 with one machine set.
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Owner VERBUND Hydro Power GmbH
Operator VERBUND Hydro Power GmbH
Commissioning 1965
Type Storage power plant
Country Austria
Region Styria
Waters Mur, Teigitsch
Output 10 MW
Annual output 14,867 MWh
Turbine Kaplan
Connectivity No fish bypass
Environmental protection at Verbund

Ecology & environmental protection

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 Kaplan turbine with horizontal shaft and a nominal output of 11,050 kW was installed in the powerhouse in 1965. 16 guide blades direct the generating water to the 7 blades of the 1.49 metre diameter impeller and process a maximum of 16.5 m³/sec. The 12,500 kVA three-phase asynchronous generator connected at the side has a nominal output of 6.3 kV. At the time of its construction, it was one of the biggest asynchronous generators in Austria.

Transformers: The generated energy is raised from 6.3 kV to 110 kV via a 12,500 kVA machine transformer and transmitted via a 110 kV line to Arnstein. In parallel, STEWEAG operates its own 110/20 kV transformer in the switchgear to be able to feed the energy into the 20 kV regional grid as an alternative.

Hierzmann annual storage: The Hierzmann annual storage was built between 1947 and 1950 and made a big improvement to the storage capacity of the Teigitsch group. The reservoir has a capacity of 7.1 million m3 and a final level at a height of 708.0 metres. The reservoir is enclosed by a 58.6 metre-high curved wall that is the highest of its kind in Styria. The headrace comprises the 985 km-long pressure tunnel, the surge chamber and the 121 metre-long armoured pressure pipeline.