The Ternberg power plant was built between 1939 and 1949. Extensive refurbishments and modernisations were made to the weir, generators and turbines between 1978 and 1980. Today, two Kaplan turbines with vertical shaft generate around 170 GWh of electricity annually.
Owner: Ennskraftwerke AG
Operator: Ennskraftwerke AG
Commissioning: 1949
Type: Run of river power plant
Country: Austria
Region: Upper Austria
Waters: Enns
Output: 42 MW
Annual Output: 177,700 MWh
Turbine: Kaplan
Connectivity: no fish bypass
Turbines and generators: Two vertically mounted Kaplan turbines achieve a maximum output of 20,200 kW at a flow rate of 120 m³/sec. and a head of 14.4 metres. The directly coupled 22,000 kVA three-phase synchronous generators supply a nominal voltage of 6.3 kV.
Transformers: The power plant has two 24,000 machine transformers for raising the generated energy from 6.3 kV to 110 kV. The electricity is transmitted via a 110 kV line to the switchgear of the downstream Rosenau power plant. The plant’s own requirements are provided by two 315 kVA transformers that draw the electricity from a 6 kV busbar.
Weir system: Each of the three weir fields is equipped with a 4.5 metre-high base roller gate, a 6 metre-high stop-log as well as a 7.2 metre-high upper roller gate.
A fish bypass for the Ternberg site is currently being evaluated. A feasibility study of ecological measures (German only) on the Enns was carried out in 2017 by the University of Natural Resources and Life Sciences Vienna (commissioned by: Office of the Provincial Government of Upper Austria, Office of the Provincial Government of Styria, Ennskraftwerke AG and VERBUND Hydro Power GmbH).
