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Successful diagonal turbine project

With pride in their domestic turbine construction know-how that enjoys global demand, the fourth generation of the Geppert family is continuing the company’s rich tradition of developing forward-looking energy solutions. First and foremost, the innovative diagonal turbine – also known as the Dériaz turbine. Its extremely high efficiency over a wide range of applications is unique.



  • Innovative for up to 5 MW of electricity
  • Hydropower from up to 80 m head
  • Unique in terms of technology and efficiency
  • Cost-saving – high benefit
  • Insensitive to cavitation

The cost-saving path to green energy

The double-regulated reaction turbine for the medium-pressure range is ideally suited for small power plants with heads of up to 80 m. Most of all, however, it is the turbine’s adjustable rotor and guide vanes that make it so efficient and give it high partial load efficiencies comparable with Kaplan turbines – no wonder it has become one of Geppert’s most successful and biggest selling products since its launch in 1999.

In the case of seasonal fluctuations in water volumes, using the diagonal turbine means that more cost-intensive options – such as the use of several Francis turbines – can be avoided. A higher standard working capacity can be achieved than with a comparable single-regulated Francis turbine, and the diagonal turbine has the further considerable advantage of being insensitive to cavitation. All water turbines and plants are designed, developed, built and carefully tested at the Geppert plant in Hall, Tirol, using world-leading engineering skills. Our efforts are focused towards protecting our global climate and preserving our environment in all its natural beauty.