Spullersee power plant, site optimisation, construction lot 1

Underground Mining Power station construction

Project data

ÖBB-Infrastruktur AG
Order sum
11,5 Mio EUR
Period of implementation
August 2019 - June 2021

Sekretariat Untertagebau
+43 5556 7181-817

In August 2019, ÖBB Infrastruktur AG commissioned Jäger Bau GmbH with the optimisation of the site of the Spullersee power plant. At 1,800 m above sea level, the Spullersee serves as a storage facility for the power plant of the same name, which started operations almost 100 years ago and has since been used to generate traction power.

At the point of initial excavation of the access tunnel, the slope was stabilised and a twelve-metre suspended arch section set up. The excavation work for the approximately 500-metre-long, cyclically driven access tunnel between the Spullersee’s south barrier and the equipment chamber at the lake began at the end of September 2019.

The equipment chamber will then be expanded and the machine construction components in this area renewed. The existing riveted, raised tunnel pipe is to be replaced by a raised GRP penstock, and a second data and energy supply line is to be installed at the same time.


The work in the surge tank includes the following works:

- approx. 15 m armoured inclined shaft

- approx. 5 m mechanical connection

- excavation and installation of a retaining sill and the discharge pipe that this will necessitate


Also commissioned were further repair measures in the Spullersee as well as the creation of the access road to the reservoir required for this purpose in the wake of the draining of the lake.


The project will be completed in the summer of 2021, after a construction period of two years.

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