DESIGN OF NEW VLH turbine-generator, as result of many years of experience and R&D in the low head turbines.


Incorporation of MJ2 technologies sas with the aim of developing the new concept of VLH turbine from a technical and scientific point of view and then starting the process of industrialization of the product.


Filing of the international patent.




At the end of 2012, MJ2 technologies is part of Sorgent.e group, which has increased its interest and now holds the majority of the share capital.

  1. Rotation axis of the structure
  2. Distributor with fish friendly profile
  3. Kaplan runner
  4. Shaft
  5. Runner blades control mechanism
  6. Self closing 8 runner blades
  7. Hydraulic lifting jacks
  8. Trake rake cleaner
  9. Direct drive variable speed PMG generator
  10. Cleaning flap gate

Low Head

VLH is able to operate with very low heads, from 1,4 to more than 4 meters.

Civil work reduction

The use of the VLH turbine allows a sensible reduction of civil works costs. The quantity of concrete is reduced and no external buildings are necessary.

Fish Friendly

Tests executed on eels demonstrate that the death rate is equal to 0%.

High Efficency

VLH guarantees an average efficiency 5% higher than traditional turbines.

No Environmental Impact

VLH displays submerged turbine and generator. Practically there is no environmental impact. The turbine is noiseless and there are no vibrations.

Island Operation Mode

It can operate fully automatically, thus without connection to the electrical grid.

Product Standardization

A standard product distributed on different sizes. The price is affordable. Low implementation and delivery schedules.

Wide Range of Heads

Thanks to the permanent magnets generator with variable speed, the VLH turbine allows a very good performance even with wide range of heads.

VLH will be the hydroelectric turbine qualified as fish friendly by the French administration


mortality ratio of the tested fishes of the VLH DN5000 with spherical stay ring and spherical hub installed on the River Tarn at the La Glacière HPP

adult Salmons in downstream migration stage

From 1.1% to 4.4%

Trouts in downstream migration stage


big Carps


small Carps

From 0% to 1.1%

The following sections are comparing the existing technologies for very low head sites regarding the size and complexity of the Civil Work structures.