While the objective of the good ecological status in the case of hydropower plants entails the introduction or increase of residual water amounts, this reduces the energy potential of the plant, which is again contrary to the Kyoto goals.

The innovative "hydro-dynamic screw system" by SAG Energietechnik uses the residual water as energy source! It basically consists of the actual hydro-dynamic screw and the grid connection, which transmits the eco-electricity generated to the supplier.

The hydro-dynamic screw, which by an inversion of the energy flow in its operation, turns the Archimedean screw pump into a power generator for the extraction of energy, is in flow direction pervious to fish and other aqueous species, but also for till. Its applications are manifold.

The system can both be incorporated in existing power plants as residual water or above surface appliance, and as exclusive hydropower machine in new plants. Its compact, self-supporting design requires little underground work, and can be directly built in a creek bed.

According to the WFD objectives, an existing “average” small hydropower plant has to be able to cope with a residual water amount between ten and thirty percent of the design charge. If the hydro-dynamic screw system is designed according to this value, a considerable part of the energy lost can be recovered. In addition, the utilisation of the excess water is also possible in extremely small differences in level (less than one metre).

In sum, this leads to an increase of the overall output and contributes to a reduction of production downtimes. In addition to its efficiency, the hydro-dynamic screw system captivates by extremely favourable investment and operating costs.
(Source: aqua press Int. 3/2005)

Contact & Information:

SAG Energietechnik GmbH
Eva Winterer
Tel.: +43/1/86 626-1310
Mobile: +43/664/83 94 093