The Kairakkum hydropower plant in the North of Tajikistan has been constructed in the 1950s. Most of the electric and mechanical equipment of Kairakkum hydropower plant has reached the end of its lifetime; therefore a major rehabilitation is needed.
The Kairakkum hydropower plant in the North of Tajikistan has been constructed in the 1950s. Most of the electric and mechanical equipment of Kairakkum hydropower plant has reached the end of its lifetime; therefore a major rehabilitation is needed. The dam at Kairakkum is a hydraulic-fill dam basically consisting of sand with no impervious core or surface layer.
The objective of the rehabilitation and upgrading of Kairakkum hydropower plant is threefold:
- Rehabilitation and upgrade of the energy generation under present and future climatic conditions,
- Raising the safety standards of the power plant, dam and reservoir to international standards, and
- Strengthening the resilience of the hydropower plant against climate change effects.
In the course of the technical evaluation, several options were discussed and prioritized for immediate implementation.
For the rehabilitation of the spillway gates, turbine intake stop logs, trash rack and trash rack cleaning machine and the draft tube stop logs, different options have been looked at during the pre-feasibility stage. It was concluded to implement as a priority the rehabilitation and the installation of automatic drives on two of the spillway gates and restore the remaining ones. The trash rack will be replaced, including the installation of an automatic self-driving cleaning machine. This way trash removal can be done in the future during normal operation and without shutting down turbines.
Most of the electric installations also have to be renewed since they have reached the end of the lifetime. New generators are needed for the installed capacity. A new automatic control system will be installed and the monitoring and surveillance system, including an alarm system for the embankment dam, will be integrated. The power house and weir structure will need some adaptation and some repair where the surface concrete is eroded and armor steel is exposed.
Denkstatt experts provided the Environmental and Social Impact Assessment works for this project. This included:
- Environmental Scoping of the project activity in close collaboration with the technical experts for the sanitation project (hydro engineers, electro technical engineers, geologists, …)
- Site assessments at the hydro power plant in Tajikistan (Khuzand area), together with EBRD
- Presentation of the Findings for the Client
- Development of the Environmental and Social Appraisal (short version of the Environmental and Social Impact Assessment)
- Development of the Stakeholder Engagement Plan
- Development of the Environmental and Social Action Plan
- Assessment of the potential CO2 emission reduction contribution of the project
- Development of the monitoring documents and reporting requirements on behalf of EBRD
Furthermore the construction of a fish-pass for the heavily fragmented Syr Darya (which leads into Aral Sea) was proposed to the Client. This is the first fish-pass in the region, especially important for the Syr Darya river since it is home to two endemic sturgeon and other endangered fish species.