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Salini Impregilo wins tunnelling works for Nenskra hydro project

Salini Impregilo has won an EPC contract worth US $575M (£373M) for the design and construction of the Nenskra hydroelectric project in Svaneti, Georgia.

The project will involve construction of a main dam, a weir on the Nakra River, a transfer tunnel, a headrace tunnel to the powerhouse and the open-air powerhouse with four vertical-axis Pelton turbines.

The weir on the Nakra River will be 9m high and 50m long (crest), and the associated transfer tunnel – 14.4km long with a 3.5m diameter – will convey the river’s water to the new reservoir.

The headrace tunnel will be 15.6km long with a 4.5m diameter. The asphalt face rockfill dam will be 135m high and 820m long (crest), with a capacity of 183M.m3 of water.

When operational, the Nenskra hydroelectric scheme will have an installed power equal to 280MW and will guarantee the energy supply needed during the winter season while maximising the export capacity during the summer season.

The project is expected to be complete by late 2020.

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