“Heghnajur” SHPP: Monitoring Results

“Heghnajur” SHPP: Monitoring Results


In the framework of the project entitled “Support to the Reforms of SHPPs through a Dialogue between the Public and The Ministry of Nature Protection of the RA for the Purpose of River Ecosystem Use” the expert group visited “Heghnajur” SHPP. “Heghnajur” SHPP is located in the administrative area of Garnaritch community, Shirak Region. The SHPP is constructed on the Heghnajur River (length – 27 km) near 'Arpi Litch' National Park. The SHPP is operated by “Arnavar” LLC.

As a result of the monitoring, the expert group found out:

  • The SHPP has been operating since 2009.
  • In recent 10 years the SHPP is the first station to have a turbine of European production.
  • The real coordinates in water intake and discharge sections and the coordinates laid down in the water usage permit comply with each other.
  • The water intake section structures complies with project solutions.
  • A stair-like fish passway made of concrete has been constructed in the section with the following parameters: length – 197.50 meters, width – 0.98 meters. The stairs are made of wood. The lower part of the fish passway is worth attention, as it doesn't have stairs and will make the movement of the fish in that part of the fish passway difficult. The administration promised to eliminate this drawback and to install stairs.
  • There is a garbage collector; the distance of the slots is 3-4  cm. Fish having 10 cm length and over will appear in the SHPP pipeline through this net.
  • There is no fish-protecting net in the SHPP head section.
  • You can meet only brown trout (Salmo fario) in the Akhuryan River, where the SHPP head section is constructed. The problem is that the dam construction caused formation of a lake-like pond, which can generate favorable conditions for the intrusion and climate accustomization, which is not a desirable phenomenon. On the other side, the water collected in the lake gets warmer in the summer and gets colder in the winter months, which also disturbs the natural migrations and living way of the brown trout in the river.
  • The environmental flow is laid down 0.03 cum/s in the water usage permit.
  • According to “Computation Center” CJSC data, in 2014 “Heghnajur” SHPP operated for 12 months and produced 2002626 kW electricity.
  • The length and diameter derivation complies with the project data. The pipeline is buried under the ground. Reclaiming has also been carried out.
  • Quality European equipment is installed in the station with complete automatic management system. Turbine is of Czech production – Crossflow make, which starts operating even in 10% of water ensurance. The generator is of German production. One turbine is installed versus projected two, the permitting document is available.
  • SHPP substation is fenced where one turbine is installed oil-collecting system.
  • A biotoilet is available for the sewage discharge.
  • Free water usage requirements were performed.
  • Landscape violations and landslides are not observed.
  • There is no water-meter sealed by a relevant environmental body in the water intake. Next year they plan to install an ultrasound equipment.
  • Automatic management system of the water level operates in the water intake.
  • The water intake has regulative equipment, which transfers certain data to the station.
  • In 2015 the State Environmental Inspection carried out inspections in the SHPp and imposed an administrative fine of 200,000 AMD, the damage caused to environment accounted for 594,000 AMD.


  • To ensure automatic management of the environmental flow in the head section.
  • To install a water-measuring device in the water intake section to control environmental flow.
  • To make the structure of the fish passway compliant with the living requirements and physical capabilities of the fish species living in the river.
  • To find technical solutions to install a fish-protecting structure.
  • To review the environmental flow set in the water usage permit, which is very low (0.03 cm/s).
  • To use the most effectiveness of the SHPP in full-water season in order to be able to stop the station in low-water season to preserve good ecosystem in the river.

The material was  developed in the frames of “Supporting reforms in the sector of small hydro power plants through enabling a dialogue between civil society  and the Ministry  of Nature Protection for sustainable use of river ecosystems” supported by UNDP/GEF Small Grants Programme".

14:01 September 15, 2015


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