Fish Friendly Free Flow Turbine

Gallery Fish Friendly Free Flow Turbine 1
Gallery Fish Friendly Free Flow Turbine 1
May 2021
Headquarters 1671 NJ Medemblik, Netherlands

Fish Friendly Free Flow Turbine - An innovative turbine system that generates, clean, renewable hydropower at uniquely high efficiency

FishFlow Innovations developed an innovative and patented design that also makes the turbine fish-friendly and silent. The turbine can withstand the incredible forces occurring at open sea. The revolutionary design saves on construction costs which makes it possible to generate electrical energy at a very competitive price per kWh. The impeller of the FishFlow Innovations Free Flow Turbine is bi-directional; it generates power when rotating clockwise as well as when rotating counter-clockwise. This means it generates electrical energy during ebb and flow when in use as a tidal turbine. The unique and patented shape of the impeller doesn’t only make the turbine fish-friendly but also makes it highly efficient. The specific shape of the impeller blades do not induce cavitation and the water leaving the impeller is released in an almost straight beam.

Key features

  • 2.1 GWh/yr yield with ø 8m turbine at 2 m/s water velocity
  • 50 years life time expectancy
  • 100% fish friendly hydropower generating clean energy
  • 95% Recyclable


  • Less than 10 years payback time
  • At least 15% more energy yield than mainstream alternative

Maturity Stage

  • Medium and large scale commercialization
  • Small scale commercialization
  • Initial market commercialization
  • Prototype testing in the real world
  • Prototype testing 1:1 in the lab

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