PI Mitterfellner

Small hydro power station Fallgrabenbach

Construction of a diversion plant at Fallgrabenbach river in the municipality of Mühlen in Murau district.

Rupert Ferner planned the construction of a small hydro power plant on the Fallgrabenbach river in the municipality area of Mühlen. PI Mitterfellner was commissioned with the completion of a feasibility study including profitability calculation and planning applications to waterway, environment and energy authorities. 

PI Mitterfellner was further responsible for drawing up the construction and detailed plan and static sizing of the plant, local building supervision and overall management of the planning and construction phase. 

The plant was successfully taken into operation in April 2014.
Small hydro power plant Fallgrabenbach is a diversion plant with residual water section and consists of a water intake, a penstock and a power house. The water intake was executed in the form of a fixed weir with a streambed intake with screen, bottom outlet and downstream underground sedimentation basin. The penstock, made from glass fibre reinforced plastic pipes with a nominal diameter of 400 mm overcomes a height difference of about 223 m at an overall length of about 1,740 m. The power house was built in reinforced concrete on the orographic right bank of Fallgrabenbach river. 

With a machine unit consisting of a two-jet Pelton wheel and an air-cooled synchronous generator, the plant generates clean electricity for about 400 households, which is fed mainly into the public grid of regional utility Marktgemeinde Neumarkt Versorgungsbetriebsges.m.b.H. 

Small hydro power plant Fallgrabenbach in the district of Mühlen thus pays a significant contribution to the generation of clean electricity, helping prevent about 32,200 tonnes of CO2 by the year 2050.

Client and operator:
Rupert Ferner

Service period:
2009 – 2016

Leaflet (German language):
KW Fallgrabenbach