Erzbach Run-of-River Power Plant

VERBUND’s Erzbach power plant is a run-of-river power plant on River Erzbach situated in the municipality of Eisenerz in Styria.

* Source: ENTSO-E Production 2017

The Erzbach power plant was built between 1980 and 1983. Two horizontally arranged Francis turbines generate an annual average of about 6.4 GWh of electricity.
 
Turbines and generators: Two Francis turbines with horizontal shaft are each coupled to three-phase synchronous generators. Machine 1 has a nominal output of 800 kW at a nominal flow rate of 2.2 m³/sec. and is connected to a 1,000 kVA generator; machine 2 supplies a nominal output of 600 kW at 1.1 m³/sec. and is coupled to a 650 kVA generator. The head at both machines is 41.2 metres. 

Transformers: The generated energy is raised to 10 kV by means of a 1,600 kVA machine transformer (built in 1984) and fed into the 10 kV grid of STEWEAG. The power plant’s own requirements are met by a 30 kVA isolating transformer.

Weir system: The single weir field across the river is equipped with a pressure segment with weir flap. The segment is raised by pull cylinders arranged at both ends; the weir flap is moved by a centrally arranged push cylinder. A prescribed doping water flow rate of 235 l/sec. must be discharged into the tailrace.