In cooperation with the Institute of hydraulic fluid machinery of the Technical University of Graz we have developed a crossflow turbine. Our turbine system is characterized by high efficiency and a very robust and heavy construction whereas we have focussed on a maximum economic solution und a very high quality standard. The turbine is offered with one or two cells. Especially the two cells execution allows a high efficiency over a big range of flow. Due to the base concept the turbine also allows to use very small hydropower potentials and so for example very good as a residual water turbine. Efficiencies up to 84% have been measured (according to IEC 620006 / TU Graz).