Turbines and generators:
The power plant is equipped with two 70,000 kVA motor generators, beneath which lie the 62,800 kW pump turbines connected by a vertical shaft. What is special here is the design of the machines as isogyre pump turbines, which enables a much lower installed height than conventional pump turbines through the combination of pump and turbine in a single housing. This plant was the prototype for a combined pump-turbine machine of this size.
Two 70 MVA main transformers convert the generated energy from 8.8 kV to 110 kV. The connection between transformer and open-air transmission line is formed by a 110 kV indoor switchgear.
The Kölnbrein annual storage facility has a capacity of 200 million m3 and a final level at 1,902 metres. The Kölnbreinsperre, a double curved wall, forms the dam for the reservoir. With a height of 200 metres, it is not only the highest valley dam in Austria but also one of the highest curved walls in Europe.
The power plant was built between 1974 and 1979 with the financial participation of Kelag and Energie AG.