The Hindu Business Line : NHPC commissions Teesta hydel units in Sikkim

The National Hydroelectric Power Corporation Ltd (NHPC) has commissioned all the three units of 510 MW (170 MW x 3) Teesta Stage-V Hydroelectric Project in the State. Of the three units, one has already been put on commercial operation and the remaining two are expected to be put on commercial operation shortly.

NHPC says that the mega hydroelectric project has been commissioned “in the shortest possible time in spite of many geological problems and vagaries of nature like flood in Teesta River, landslides and unforeseen geological surprises experienced in dam, tunnel, surge shaft and dam abutment, and so on.”

The project will generate 2,573 million units energy annually in a “90 per cent dependable” year. Its cost is approximately Rs 2,650 crore and the provisional tariff approved by CERC is Rs 1.62 per unit. The beneficiaries of the project are DVC, Bihar, Orissa, Jharkhand, West Bengal and Sikkim.

The Teesta Stage-V Project, one of the six hydro power schemes in a cascade identified on River Teesta, is a run-of-the river scheme located in the east district of Sikkim. This is the first project to be commissioned in the cascade development of Teesta river.

Teesta Stage-V is the second project commissioned by NHPC in Sikkim, the first one being the 600MW Rangit Project.

The major components of the Stage-V Project are a 96.45-metre high and 182.50 metre long concrete gravity dam, a 9.5-metre diameter and 17.106 km long Head Race Tunnel, a 30-metre diameter and 92 m high semi-underground Surge Shaft, three vertical pressure shafts of approximately 175 metre deep with a diameter of 4.7 metre, an underground Power House with three units of 170 MW each and three D-shaped Tail Race Tunnel of 6 metre width with lengths varying from 155 metre to 175 metre.

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