Gemeinschaftskraftwerk - Inn

Construction Lot Penstock and Powerhouse Prutz/Ried


GKI Gemeinschaftskraftwerk Inn GmbH, Landeck, Austria


BeMo Tunnelling GmbH (deputy technical sponsor)
26 % in JV with:
G. Hinteregger & Söhne Baugesellschaft m.b.H. (technical sponsor), Östu-Stettin Hoch- und Tiefbau GmbH (commercial sponsor), Wayss & Freytag Ingenieurbau AG (deputy technical sponsor)

Project location

Prutz/Ried, Tirol, Austria

Start of construction


End of construction


Project total value

56.5 million €


Mainly sericit- and limestone phyllites (slate structure), partly intermediate layer consisting anhydrous (from cm up to dm thickness)

Technical Data

• Power 89 MW, flow rate after expansion max. 75 m³/s, gross head 160.7 m
• Power penstock:
inclined shaft A = 22 m², length 380 m (31 % slope),40 m flat track, conventional drive with backfilled steel segments inner-Ø 3.80 m
• Surge chamber:
shaft A = 188 m²,height 100 m, inner- Ø 13.8 m, with membrane and
in-situ concrete inner lining (raise boring Ø = 1.84 m, length 98 m, vertical)
top chamber length 75 m, A = 40 m²
shaft head length 25 m, A = 155 m²
• Unit chamber (at intersection surge chamber/power penstock/reverse
drive head race tunnel) length = 20 m, A = 225 m²
with access and bypass tunnel length = 380 m, A = 48 m²
• Conventional reverse drive head race tunnel with in-situ concrete lining
pressure tunnel / connecting tunnel length 1,041 m / 15 m
A = 43 m² / 50 m²
• Access roads length = 1,300 m with up to 31 % incline

Further project related information

• All works without electrical and mechanical equipment and without hydraulic steel structures for the components and with all secondary work, power transmission, access roads and traffic assignment
• Subcontractor-Services: Powerhouse l/w/h 34/23, (32)/34, 8 m for two vertical machine units, Drilled pile shaft with underwater concrete slab,
Powerhouse shaft in reinforced concrete with crane-shed on the surface and closed underwater canal, length 310 m