Baku, Azerbaijan, May 16
Trend:
JSC Nenskra Hydro, the Nenskra Hydropower Plant (HPP) project company in Georgia will use modern technology for excavation in the Nensker HPP tunnels, namely, the two Double Shield TBMs Tunnel Boring Machines), custom-made specifically for JSC Nenskra Hydro by the German company Herrenknecht, will be used, Trend reports via Georgia Today.
The length of the machines is 190 and 250 meters, and the diameter is 4.3 m and 5.3 m. Both machines have already been delivered to Georgia, and the equipment is currently stored in the city of Poti.
The infrastructure of the Nenskray hydroelectric station will include two tunnels. The Nakra tunnel will connect the Nakra valley to the Nenskra valley and will be about 12.5 km long, and 3.5 m in diameter, it will divert water from the Nakra dam to the Nenskirskoye reservoir. The tunnel of Nenskra runs along the left bank of the Nenskra valley and is about 15.1 km long and 4.5 m in diameter. The tunnel connects the reservoir to the powerhouse.
Excavation in the tunnels are planned from 2020. Prior to this, preparatory work is underway in the Chuberi and Nakra villages of Mestia municipality, which include the construction and rehabilitation of bridges and roads, as well as the construction of power supply lines.
"The use of TBM has several advantages, first of all, safety and reduction of environmental impact. The TBMs we have purchased for the project combine tunnel excavation with concrete segment lining, which guarantees the safety of the workers, as well as the safety and efficiency of the tunnels’ operation in the future”, said Teimuraz Kopadze, Chief Operations Officer of JSC "Nenskra Hydro".
JSC “Nenskra Hydro” was founded in 2015 as a result of cooperation between K-Water, the Korean Water Resource Corporation and JSC Partnership Fund. The company will construct a high dam HPP in the municipality of Mestia, in the valleys of Nenskra and Nakra. A hydropower plant with an installed capacity of 280 MW will annually provide Georgia with total power generation of 1,200.00 GWh.