The Limberg III pump storage power plant will be built almost identical to the Limberg II pump storage power plant and will connect the two existing storage lakes Mooserboden and Wasserfallboden in the municipality of Kaprun i. The new electro-mechanical installations power plant facilities will be placed in an new underground cavern, gallery and structure system.

Driven waterway

• Inlet gallery L = 768m; A = 43 m²
• Slide chamber Drossen V = 6'000 m³
• TBM headrace tunnel L = 3'206m; A = 42 m²
• Inclined or pressure shaft TBM

L = 771m; A = 26 m²

• Underwater gallery L = 613m; A = 60 m²

Power and transformer cavern

• Power cavern V = 53'000 m³

Transformer cavern V = 15'500 m³

Surge chamber

• Upper chamber L = 286m, A =47 / 29 m²
• Lower chamber (widening) L = 179m, A =90 m²

Limberg access tunnel

• Safety gallery L = 203m, A = 29 m²
• Ventilation and drainage gallery

L = 460m; A = 35 m²

• Drossen slide chamber access gallery
• Access gallery L = 338m; A = 35 m²
• Evacuation gallery L = 111m, A = 35 m²
• Drainage gallery L = 126m, A = 11 m²

Concrete box Drossen

• Concrete box L = 110 m

Storage areas (landfill for excavated material)
Hinterwald V = 300'000 m³

• Drossen V = 290'000 m³

Site facilities

• Hinterwald A = 14'200m², 1'850 müA
• Mooserboden A = 12'900m², 2.025 müA
• Kehre 6 A = 6'650m², 880 müA

The Limberg III project area is dominated by the several kilometer thick 'Bündner Schieferserie' in the Glockner facies of the Tauern schist envelope. It consists largely of an alternating bedding of calcareous mica schists with prasinites prasinites and dark mica schists. At the Höhenburg, quartzites and dolomites are also intercalated.