Mandling Storage Power Plant

VERBUND's power plant at Mandling is a storage power plant situated in the municipality of Mandling in Styria. It was constructed from 1983 until 1985 by Steirische Wasserkraft- and Elektrizitäts-AG.

Downstream of the Kalter and Warmer Mandling, a weir gate system dams the Mandlingbach stream. The headrace is channelled via a pressure tunnel to the equipment chamber, from where an underground steel pressure tube line leads to the powerhouse. Each year, the power plant generates 21 GWh of electricity from 100% hydropower, with which it can supply almost 4,700 households with environmentally friendly electricity.
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Image from the Location

Owner VERBUND Hydro Power GmbH
Operator VERBUND Hydro Power GmbH
Commissioning 1985
Type Run-of-river power plant
Country Austria
Region Styria
Waters Enns, Mandling
Output 06 MW
Annual output 20,800 MWh
Turbine Francis
Connectivity No fish bypass
Environmental protection at VERBUND

Ecology & environmental protection

There is no fish bypass at the location, nor will one be implemented, as this would not be of added ecological value. 

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
Downstream of the Kalter and Warmer Mandling, a weir gate system at 930 metres above sea level dams the Mandlingbach stream approx. 6 metres above the riverbed and forms a lake with a capacity of more than 10,000 m³. The generating water is channelled via a 2,231 metre-long pressure tunnel to the equipment chamber, from where an approx. 670 metre-long underground steel pressure tube line leads to the powerhouse. The extraction section is supplied with residual water via a feed facility. Once the generating water has done its job in the turbine, it flows from an outlet on the south side of the powerhouse through a 26.7 metre-long underwater drain into the Enns. 

Turbines and generators: The power plant has a Francis turbine with a rated output of 6,100 kW. The impeller diameter is 1.04 metres, the swallowing capacity 5 m³/sec. The directly coupled three-phase synchronous generator has a rated voltage of 6,300 V and a rated output of 7,500 kVA. 

Transformers: The 7,500 kVA machine transformer converts the energy from 6.3 kV to 30 kV. The electricity is conducted away via the 30 kV line of STEWEAG, which passes by the power plant. 

Weir system: The weir system consists of the headrace inlet, the sluice gate and the flood relief system. The latter is equipped with a welded weir gate that can be raised with a hydraulic draw cylinder during times of lower water and lowered during flooding.