Sölk Storage Power Plant

VERBUND's power plant of Sölk is a storage power plant and situated east of the town of Stein in the municipality of Großsölk in Styria. It was constructed from 1975 until 1978.

Technical Description 

The Sölktal valleys with their large drainage basin and high annual volumes of water make the construction of the hydropower plant particularly economically beneficial. In Grosssölktal, a daily storage power plant was constructed on compatible ground and in a geologically favourable spot and is sealed off by a 39 m high arched wall. The maximum water level of the Grosssölk reservoir, with its net capacity of 1.5 million m3, is 901.8 m. In the reservoir, the water of the Kleinsölk stream is channelled via a 3.3 km long stream diversion headrace tunnel, the water from the Donnersbach and Walchenbach are channelled via a roughly 12 km long grade tunnel. The works water conductor comprises a 5.1 km long headrace tunnel, a surge shaft and a 0.9 km long installed pressurized pipeline. 

In the Stein powerhouse there is one machine unit with vertical shaft and a total capacity of 61,000 kW. The machine unit is made up of one Francis spiral turbine and one synchronous generator. 

Technical data:

Owner: VERBUND Hydro Power GmbH
Operating company: VERBUND Hydro Power GmbH                                 
Beginning of operation: 1978
Type:  Storage
Country, State: Austria, Styria
Waters: Großsölkbach
Capacity: 61 MW
Annual generation: 209,986 MWh
Turbines: Francis 
Fish bypass: no