Hieflau-Erzbach Run-of-River Power Plant

VERBUND power plant Hieflau-Erzbach is a run-of-river power plant situated on the Erzbach and in the municipality of Hieflau in Styria. It was built between 1953 and 1956 by Steirische Wasserkraft- und Elektrizit├Ąts-AG.

*Source: ENTSO-E Production 2017

The Hieflau-Erzbach power plant was built between 1953 and 1956 at the same time as the neighbouring Hieflau power plant. The power plant was modernised in stages, starting in 1989. A generator was replaced, the bedload channel and weir system extended. Today, the run-of-river power plant generates an annual average of 1 GWh of electricity entirely from hydropower.
Turbines and generators: A Kaplan turbine is located in the machine hall. With its four-blade, 1.125 metre impeller, the turbine has a nominal output of 300 kW at an intake capacity of 5 m³/sec. The subsequent 300 kVA three-phase generator has a nominal voltage of 400 V.

Transformers: The generated energy is raised to 30 kV via a 400 kVA machine transformer and fed into the regional grid of STEWEAG.

Weir system: The Erzbach is dammed to a height of 6 metres with a wooden weir upstream of the Hieflau power plant and the water fed into the turbine. For the removal of the bedload, there is a dedicated bedload channel at the foot of the weir, which leads to the Enns parallel to the tailrace.