Khandong Dam
The Khandong dam
Location in Assam
Official name	Kopili Hydro Electric Project
Location	Assam, India
Coordinates	25°31′43″N 92°37′58″E / 25.5286173°N 92.6327813°E / 25.5286173; 92.6327813
Purpose	Power
Opening date	1984
Owner(s)	Government of India
Dam and spillways
Type of dam	Concrete Gravity
Impounds	Kopili River
Height	66 metres (217 ft)
Length	243 metres (797 ft)
Spillway capacity	15417 m³/s
Reservoir
Creates	Kopili Reservoir
Total capacity	166800
Surface area	13.36 square kilometres (5.16 sq mi)
Khandong Power House
Coordinates	25°31′01″N 92°39′58″E / 25.5168635°N 92.6660943°E / 25.5168635; 92.6660943
Operator(s)	NEEPCO
Commission date	8 March 1984
Turbines	3×25 MW
Installed capacity	75 MW
Annual generation	363.9 MU
Website NEEPCO

Umrong Dam
View of Umrong Reservoir from Umrangso
Official name	Kopili Hydro Electric Project
Coordinates	25°31′43″N 92°42′45″E / 25.5284962°N 92.7126092°E / 25.5284962; 92.7126092
Purpose	Power
Opening date	1988
Dam and spillways
Type of dam	Concrete Gravity
Impounds	Umrang river
Height	30 metres (98 ft)
Length	143 metres (469 ft)
Spillway type	Ogee Radial
Spillway capacity	554.7 m³/s
Reservoir
Creates	Umrong Reservoir
Total capacity	175000
Surface area	16 square kilometres (6.2 sq mi)
Kopili Power House
Coordinates	25°35′10″N 92°43′23″E / 25.586020°N 92.723019°E / 25.586020; 92.723019
Operator(s)	NEEPCO
Commission date	4 July 1988
Turbines	4×50 MW
Installed capacity	200 MW

Kopili Hydro Electric Project is a 275 megawatts (369,000 hp), hydroelectric power project on the Kopili river and its tributary, Umrong stream. It is located in Dima Hasao district of Assam state in India.^[1] The project is developed and operated by North Eastern Electric Power Corporation Limited. It is an important project since the indian State of Assam, Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland and Tripura benefit from this project^{[citation needed]}.

Overview

The Khandong dam impounds Kopili river and Umrong dam impounds Umrong river creating Kopili reservoir and Umrong reservoir. Kopili reservoir partially falls in Meghalaya state as Kopili river forms geographical boundary between Assam and Meghalaya in this region. Water from Kopili reservoir is fed to Khandong power station, releasing water into Umrong reservoir. Water from Umrong reservoir is diverted via tunnels to Kopili power station on the bank of Kopili river. Tail race waters of Kopili power house are released back into the Kopili river.^[1] Although this project is not classified as such, its design is very similar to run-of-the-river power projects.

Power plants

Khandong I & II

The Khandong power house stage-I and stage-II are located between two reservoirs, near Umrong reservoir, in geographical location 25°31′00″N 92°39′58″E / 25.5168°N 92.6660°E / 25.5168; 92.6660 and Khandong dam is located at 25°31′43″N 92°37′58″E / 25.5286°N 92.6327°E / 25.5286; 92.6327. Khandong Stage-I powerhouse has 2x25 MW Francis type turbines, generating 50 MW power at peak. It is connected to Kopili reservoir via 4.5 m diameter, 2852 m long concrete-lined head race tunnel. First and second units of stage-I were commissioned on 8 March and 3 May 1984 respectively. Khandong stage II powerhouse is located close to stage-I power station. It has 1x25 MW turbine, connected via 480-m-long water conductor system, which was provisioned for at the time of stage-I construction. Third turbine was commissioned on 26 July 2004.^[1][2]

Kopili I & II

The Kopili power house stage-I and stage-II are located on the right bank of Kopili river in geographical location 25°35′10″N 92°43′23″E / 25.586°N 92.723°E / 25.586; 92.723. The related Umrong dam, completed in 1988, is located at 25°31′42″N 92°42′45″E / 25.5284°N 92.7126°E / 25.5284; 92.7126. Khandong Stage-I and II powerhouse is installed with 4x50 MW Francis type turbines, generating 200 MW power at peak. It is connected to Umrong reservoir via 4.6 m diameter, 5.5-km-long concrete-lined head race tunnel. The first unit of stage-I was commissioned on 4 July 1988.^[2]

Lower Kopili HEP

Because of contamination of Kopili river waters, the prospect of Lower Kopili Hydro Electric Project downstream of Kopili powerhouse has met with hurdles for environmental clearances and financial funding of the project. The 120 MW power project will be funded by the Asian Development Bank.^[3][4]

Environment issue

This hydroelectric project has suffered some serious damage due to contamination of Kopili river with acid mine discharge from open cast coal mines and rat hole mining in Meghalaya.^[5][6][7]

Incidents

2019

The Hydro project site was submerged and flooded following a pipeline burst on 7 October 2019. 4 people has since been reported missing in the overflowing project site. The burst happened on an old pipe, which was repaired the previous year.^[8][9]

2022

Incident at Khandong Power Plant claimed lives of three persons.^[10]

Interactive map

5km
3miles

Umrong Reservoir

Kopili Reservoir

Kopili P.H.

Umrong Dam

Khandong P.H.

Khandong Dam

  

Kopili Hydro Electric Project