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.

Man in the kitchen

34.117 households

supplies the Kaprun upper stage/Limberg 2 power plant


113.966 avoided
tonnes of CO2*


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. 

Image from the Location

Owner VERBUND Hydro Power GmbH
Operator VERBUND Hydro Power GmbH
Commissioning 1956
Type Pumped-storage power plant
Country Austria
Region Salzburg, Carinthia
Waters Möll, Käferbäche, Kapruner Ache, Leiterbach, Ebmattenbäche, Wielingerbach
Output 593 MW
Annual output 152,092 MWh
Turbine Kaplan
Connectivity No fish bypass

Sustainable construction at pumped storage power plant Limberg II

Mooserboden and Wasserfallboden storage facilities:

The final level of the Mooserboden storage facility is 2,036 m above sea level. The topographical situation required two damming structures for the storage facility: the Mooser dam and the Drossen dam. The final level of the Wasserfallboden storage facility is located at an elevation of 1,672 m above sea level and includes the damming structure, the Limberg dam. 

Limberg I

The powerhouse was built entirely on rock at the foot of the Limberg dam. Two sets of machinery with horizontal shafts (two Francis turbines) and a total bottleneck capacity of 112 MW (without auxiliary sets of machinery) are installed in the powerhouse. Each set of machinery comprises a Francis turbine, a motor generator, a gear coupling and a two-stage, double-flow pump. 110 kV indoor switchgear was installed in the powerhouse. The energy is conducted via a 110 kV double-circuit transmission line to the Kaprun open-air switchgear.

Limberg II

Limberg II, the “green battery”, represents the most significant expansion of the Kaprun power plant group since the commissioning of the upper stage in 1956. Two caverns, a power cavern and a transformer cavern were built underground in the rocks. Two vertically installed pump turbines, each with an intake capacity of 72 m³/sec, deliver 240 MW of valuable peak energy each during pumping and turbine operation.