Tehri Dam

Tehri Dam Technical Layout

Tehri dam is about 260.5 metres (855 ft) high rock and earth-fill embankment dam. Its length is 575 metres (1,886 ft), crest width 20 metres (66 ft), and base width 1,128 metres (3,701 ft). The dam creates a reservoir of 2.6 cubic kilometres (2,100,000 acre sq ft) with a surface area of 52 square kilometres (20 sq mt).

The installed hydro capacity is 1,000 MW along with an additional 1,000 MW of pumped storage hydroelectricity. The Tehri Dam and the Tehri Pumped Storage Hydroelectric Power Plant are part of the Tehri Dam Hydro power Complex which also includes the 400 MW Koteshwar Dam .

Scheduling and generation despatch

The Scheduling and Despatch of the Tehri Dam Hydro Power plant is done by Northern Regional Load Despatch Centre which is the apex body to ensure the integrated operation of the power system grid in the Northern region and comes under Power System Operation Corporation Limited (POSOCO). At present, THDC India Ltd. is generating around 3000 million Unit of energy annually from this dam.

Tehri Dam Advantages

• 2400 megawatt electricity.
• Clean Drinking water to almost 40 lakhs of people living in Delhi.
• Clean Drinking water to almost 30 lakhs of people living in and around Uttar Pardesh.
• Less flooding in low lying areas of Uttar Pradesh , West Bengal and Bihar.
• Employment Generation for the local people.
• 12% of the total electricity generated as royalty to Uttarakhand.
• Increase in Tourism sector , Fish Irrigation Projects and other Govt. Projects in Uttarakhand.
• Rs2400 crores profit to the Central Government every year.
• Land Irrigation water to almost 270,000 hectares to Uttarakhand , UttarPradesh and New Delhi.

Tehri Dam Issues

The Tehri Dam project has brought concerns about the environmental problems of locating a large dam in the delicate ecosystem of the Himalayan foothills.

There are growing concerns regarding the dam's stability. Tehri dam is located 7.5kms above the Central Himalayan Seismic Gap, which is a major geologic fault zone. This region was the site of a 6.8 magnitude earthquake in October 1991, with an epicentre 5 km from the location of the dam. Building of the dam will put further pressure on the seismic gap and thus increases the chances of an earthquake.

The Tehri dam is designed to withstand an earthquake of 8.4 magnitude, but some seismologists say that earthquakes with a magnitude of 8.5 or more could occur in this region.

This could result in a dam-break and the flood waters from the dam could submerge numerous towns comming in the way. Tehri dam has been in active protest by environmental organizations and local people of the region.

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