ANNEX II - Small Scale Hydropower - IEA Implementing Agreement

Innovative Technologies

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121-1 Very Low Head Turbine Generator
Electrical & Mechanical Equipment


The VLH Turbine is designed specifically for very low head sites (1.4 to 3.2 meters and up to 4.5 with reinforced structure). The objectives of the designers of the VLH turbine was to develop a unit that  requires very few civil work, is easy to install and offers a high degree of reliability at a reasonable cost per installed KW. To achieve these goals, the VLH concept takes a completely different approach from the traditional turbine design, using large runners to practically eliminate the expensive civil structures of the traditional concept. It includes advanced technological characteristics such as Directly driven Permanent Magnet Variable speed Generator. Finally, the VLH offers a very good environmental integration, it is noiseless and submersed, and it has a unique fish friendly capacity.

Features & Advantages

  • Fitted for Hydro Power sites with heads lower than 3.2 m and up to 4.5 with customised reinforced structure
  • Integrated Variable Speed Turbo Generator for Very Low Head sites
  • Standard Range of product with 5 Turbine Runner Diameter Sizes from 3.15 up to 5 m diameter
  • Simplified and cost saving Civil Work infrastructure (see figures and pictures in attachments)
  • Fish Friendly Turbine. Demonstraded after 6 live fish passage tests and one behavioural test of 2 years duration
  • Allows Profitable harnessing of very low head sites thanks to optimised reduced Civil Work Costs
  • High Performances, high efficiency and production capacity thanks to variable speed generation, and high efficency runner performances
  • Fish friendly turbine confirmed by tests with living salmons, trouts, carps and eels, very low mortality of fishes migrating through the working turbine.
  • Height Visual integration, submersed turbogenerator set.
  • Completely Silent and Vibrationless functioning, can be installed in urban areas.

Technology Owner

MJ2 Technologies S.A.S. — www.vlh-turbine.com


France with support from Canada
Innovative Technologies
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Kearon Bennett, P. Eng.,
Operating Agent and Secretary
Annex II, Small Hydro
IEA Hydropower Agreement