Kreuzbergmaut Run-of-River Power Plant

The joint-venture power plant Kreuzbergmaut is a run-of-river power plant on the Salzach, situated on the central Salzach River near Pfarrwerfen in Salzburg.

*Source: ENTSO-E Production 2017

The Kreuzbergmaut power plant was built between 1993 and 1995 and was the basis of the development of the “Middle Salzach” section between Schwarzach and Werfen. Two Kaplan bulb turbines generate an annual average of about 80 GWh of electricity entirely from hydropower.
Turbines and generators: Two horizontally installed Kaplan bulb turbines have an output of 9,310 kW each with a head of 10.2 metres. The four-blade impellers with a diameter of 3.65 m have an intake capacity of 100 m³/sec. The two bulb turbine generators have a nominal output of 10,500 kVA. The generators are cooled by means of a closed circuit, which is re-cooled with water from the Salzach.

Transformers: Two 10,500 kVA machine transformers raise the generated energy to 30,000 V. Transmission is via two parallel 30 kV cable lines to the Pongau substation of Salzburg AG. The plant additionally has two 400 kVA transformers to cover its own requirements.

Weir system: In order to control the three-field weir system, welded pressure segments in the box design with weir flaps are used. With a clear width of 10 metres, the barriers enable a total dammed height of 10.0 metres. The drive is oil-hydraulically via pull cylinders arranged in pairs at the side of the segments and a centrally arranged push cylinder on each of the weir flaps.