Nenskra Hydropower Project

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The Nenskra HPP is a high-head 210MW hydropower project on the Nenskra River in the Svaneti District of NW Georgia. The project was initially conceived in 2009 and 2010 through various visits to the project area culminating in a Pre-Feasibility Study produced in March 2010, and a detailed Feasibility Study produced in May 2011 by Swiss Engineering consulting firm Stucky. The preliminary environmental studies were carried out during the feasibility study. The main project components are expected to comprise a 135m high, asphalt-core rockfill dam on the upper Nenskra river creating a live storage of about 182million m3. The dam will capture the flows of the Nenskra River and the adjacent Nakra river upstream of the existing Khudoni HPP reservoir, exploiting the available head of 725m. The Nakra River is connected to the main scheme through a 4.5m diameter free-flow tunnel of 12.4km. The power waterway comprises a segmental lined headrace tunnel of 15.1km, 4.5 m diameter, pressure shaft and penstock totaling 1580m. The surface powerhouse is located on the left side of the river and houses 3x70MW pelton units. A 5yr construction schedule has been elaborated for completing the project. The project should be capable of providing a total / firm energy generation of 1194/927GWh/y, 264 GWh of guaranteed full supply in the three winter months. The total investment is expected to be ~450Mio USD.