Lower Subansiri Dam
| Subansiri Lower Project | |
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Location of Lower Subansiri District, Arunachal Pradesh, Northeast India
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 Location of the Subansiri Lower Dam in Arunachal Pradesh
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| Official name | Subansiri Lower Hydroelectric Power Project (LSHEP) |
| Country | India |
| Location | Assam & Arunachal Pradesh |
| Coordinates | 27°33′13″N 94°15′31″E / 27.55361°N 94.25861°ECoordinates: 27°33′13″N 94°15′31″E / 27.55361°N 94.25861°E |
| Status | Under construction |
| Construction began | December 2007 |
| Opening date | 2016 |
| Construction cost | Rs. 62.9 billion (December 2002 est.) |
| Owner(s) | NHPC Limited |
| Dam and spillways | |
| Type of dam | Concrete gravity |
| Impounds | Lower Subansiri River |
| Height | 116 m (381 ft) |
| Height (foundation) | 130 m (427 ft) |
| Length | 284 m (932 ft) |
| Dam volume | 2,250,000 m3 (2,942,889 cu yd) |
| Spillway type | Ski jump |
| Spillway capacity | 37,500 m3/s (1,324,300 cu ft/s) |
| Reservoir | |
| Total capacity | 1.37 km3 (1,110,677 acre·ft) |
| Active capacity | 0.44 km3 (356,714 acre·ft) |
| Surface area | 33.5 km2 (13 sq mi) |
| Power station | |
| Operator(s) | NHPC Limited |
| Commission date | 2016-2018 (est.) |
| Turbines | 8 × 250 MW Francis-type |
| Installed capacity | 2,000 MW (max. planned) |
| Annual generation | 7,421 GW·h |
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Website Subansari (Lower) Project |
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| Subansiri Lower Dam bridge | |
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| Carries | vehicles |
| Characteristics | |
| Total length | 150 m (492 ft) |
| Width | 150 m (492 ft) |
The Subansiri Lower Dam, officially named Subansiri Lower Hydroelectric Project (SLHEP), is an under construction gravity dam on the Subansiri River in NorthEastern India. It is located 2.3 km (1.4 mi) upstream of Gerukamukh village in Dhemaji District and Lower Subansiri District on the border of Assam and Arunachal Pradesh states. Described as a run-of-the-river project by NHPC Limited, the Project is expected to supply 2,000 MW of power when completed. The project has experienced several problems during construction to include landslides, re-design and opposition. It was expected to be complete in 2018. It is notable that, if completed as planned, it will be the largest hydroelectric project in India.
The concrete gravity dam is designed to be 116 m (381 ft) tall, measured from the river bed and130 m (430 ft) from foundation. Its length will be 284 m (932 ft) and the dam will have a structural volume of 2,250,000 m3 (2,942,889 cu yd). The reservoir created by the dam will have a gross storage capacity of 1.37 km3 (1,110,677 acre·ft), of which .44 km3 (356,714 acre·ft) can be used for power generation or irrigation. At normal level, the reservoir's surface will cover 33.5 km2 (13 sq mi). The surface powerhouse, located on the left bank, will contain eight 250 MW Francis turbine generators.
There will be eight horse shoe shaped head race tunnels, each being 9.5 m (31 ft) in diameter and having a length from 608–1,168 m (1,995–3,832 ft). There will be eight horse Shoe shaped surge tunnels, each being 9.5 m (31 ft) in diameter and having length from 400–485 m (1,312–1,591 ft). There will be eight horse shoe/circular shaped with varying diameters of 7–9.5 m (23–31 ft) and lengths of168–190 m (551–623 ft). The tail race channel, which will transfer water discharged by the turbines back to the river, is 206 m (676 ft) wide and 35 m (115 ft) long.
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