Kaprun Upper Stage Pumped Storage Power Plant

VERBUND's power plant at Kaprun, upper stage, is a pumped storage power plant and situated in the municipality of Kaprun in Salzburg. It was constructed from 1950 until 1955.

Roughly 50 % of the water which is stored in the Mooserboden and Wasserfallboden reservoirs and is used for generating electricity at the Kaprun Upper Stage and Kaprun Main Stage power plants, comes from the South of the Alps; it is mostly melt water from the Pasterzen glacier from the Grossglocker mountain.
Water from the deeper lying Wasserfallboden reservoir can be pumped into the Mooserboden reservoir using the pumps at the Kaprun-Oberstufe power plant. 

Mooserboden and Wasserfallboden Reservoir

The capacity level of the Mooserboden reservoir lies at 2,036 m above sea level. The topographical situation required two dams for the reservoir: The Mooser dam, a 107 m high gravity retaining masonry wall with full arch effect as well as the Drossen dam, which is a 112 m high arch dam. The capacity level of the Wasserfallboden reservoir located below, lies at a 1,672. sea level. The dam construction, the Limberg dam, was constructed as a 120 m high double curved arch dam. 

Powerhouse Limberg I

The powerhouse was constructed at the foot of the Limberg dam downstream; it is entirely built on a cliff. In the powerhouse there are two machine units with horizontal shafts and an installed capacity of 112 MW altogether (without a subsistence machine unit). Every machine unit is made up of a Francis turbine, an engine generator, a denture clutch and a two tier, two-pass pump. In the powerhouse, a 110kV indoor switch room has been built. The transporting of energy takes place using a 110 kV double circuit to the outdoor substation in Kaprun.