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Excavation underway for India’s hydroelectric project

Construction on the Vishnugad Pipalkoti hydroelectric project in India is progressing and preparations are underway for delivery of the tunnel boring machine (TBM).

The 444MW scheme, located in the Chamoli district of Uttarakhand, aims to increase the supply of electricity to India’s national grid with renewable energy.

Contractor HCC is delivering the civil works programme, including the dam, the 12.1km headrace tunnel, the underground powerhouse and the 3.07km tailrace tunnel.

The excavation of the upper strata of the diversion tunnel is now complete and work on the lower strata is in progress. Works on the access tunnels to the water intake channel, the de-silting chamber and the headrace tunnel are also underway.

The TBM will be used to excavate the headrace tunnel that will carry water from the reservoir to the powerhouse.

The approach road to the TBM platform is complete and preparatory work on the platform is in progress and will be ready in time for the delivery and assembly of the tunnelling machine in February 2016.

Work has also begun on the adits for the main access tunnel and the ventilation tunnel for the proposed underground powerhouse.

The US$922M (£590M) project is expected to be complete by December 2017.

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