"HCC has been awarded Rs 635 crore contract by NTPC to construct Head Race Tunnel (HRT) for Tapovan Vishnugad Hydroelectric Power Project on the River Dhauliganga in Chamoli District of Uttarakhand," the company said in a statement.
The project is to be completed in 34 months.
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"This is an item rate contract involving salvaging of Double Shield Tunnel Boring Machine stuck in the earlier operation by other contractor, refurbishing and putting it in operation to construct 2.84-km long HRT, installation of segmental lining," the statement said.
The contract also involves construction of 1.66 km long tunnel using drill and blast method, and concrete lining.
HCC, President & CEO Engineering & Construction, Arun Karambelkar said: "We are pleased to secure this contract, which only manifests the expertise of HCC in managing complex work in difficult terrain.
"We are confident that our efficient and highly skilled team will not only salvage the stuck Tunnel Boring Machine but will complete the construction of Head Race Tunnel in the stipulated time frame."
With this contract, HCC order book has reached Rs 5,155 crore in the current financial year. Besides, the company is the lowest bidder in six projects worth Rs 4,300 crore.
The combined order backlog is likely to cross Rs 21,000 crore in financial year 2015-16.
HCC has executed many of India's landmark infrastructure projects and claims constructing 28% of India's Hydel Power generation and over 65% of India's Nuclear Power generation capacities, over 3,600 lane km of Expressways and Highways, more than 300 km of complex Tunneling and over 350 Bridges.