The double rotating hydropower screw:

Energy generation + injury-free fish migration

Determine your potential of electricity generation

With the double rotating hydropower screw with integrated fish lift you will meet the requirements of the EU Water Framework Directive and generate electricity.

The patented, gap-free hydropower screw including the fish lift makes injury-free fish migration possible as well as the movement of microorganisms and sediment past transverse structures with simultaneous electricity generation.

This makes the Hydroconnect hydropower screw the fish-friendly and energy-efficient solution for complying with the EU Water Framework Directive (WFD).

Video introduction

Medal-Austrian-State-Prize-Environment-Climate_EN

Benefits of the hydrodpower screw

all benefits in detail

Injury-free fish migration

Fish and other river life pass transverse structures and dams without injury and effortlessly.

Low space requirements

The thin hydropower screw requires a minimum amount of construction work, protects the riverbed and is integrated inconspicuously into the landscape.

High efficiency

Up to 70% electrical efficiency (=power output at electrical connector terminals) – even if the water level is low – thanks to the patented, gap-free and fish-friendly construction.

The solution in use

all locations

Location	Country	River	Maintainer	Predominant fish	Drop height
Großarlbach	Austria	Großarler Ache	Energiebetrieb Hettegger GmbH	trout, grayling up to 80cm	2.7m
Scheibbs	Austria	Erlauf	EVN naturkraft GmbH	Danube salmon, 80cm	5,6m
Ainring	Germany	Hammerauer Mühlbach	Stahlwerk Annahütte Max Aicher GmbH & Co. KG	Danube salmon, 100cm	7.17m
Spittal on the Drau	Austria	Lieser	Lieser Energie GmbH	Danube salmon, 80cm	4.6m
Berndorf	Österreich	Mürz	Norske Skog Bruck GmbH	Danube, 100cm	6.6m

Frequently asked questions

all FAQ’s

How high is the efficiency of the Hydroconnect hydropower screw with double rotating cylinders?

The mechanical efficiency is up to 90%. This results in electrical efficiency, minus all the mechanical losses, of 65% even for small systems. In larger systems, the electrical efficiency increases to 70% and more.

With what water supply does the system work for electricity generation and fish migration?

The system can be used starting with a supply of 100 l/s. The highest flow rate is currently offered at 6,500 l/s. These systems are very well suited as residual water machines or as main machines for small locations.

What is the service life of a hydrodynamic screw with double rotating cylinders?

The HYDROCONNECT hydropower screw with double rotating cylinders is calculated for fatigue strength. The selected corrosion allowance with the choice and thickness of material ensures a minimum service life of 30 years.

Has 100% freedom from injury been proven by recognised centres for all river life?

Yes, of course. All research programmes and monitoring studies were accompanied by the Institute for Hydrobiology and Water Management (HG) at the University of Natural Resources in Vienna (BOKU). 100% freedom from injury was confirmed by BOKU in numerous studies.

Your project

Additional questions? Contact your product account manager Nino Struska. He would be happy to answer your questions and help you during the planning and realisation.