KARBI LANGPI POWER PROJECT

1

Built on river Langpi which originates from Meghalaya.

Project was sanctioned by the Planning Commission in1979.

Contracts for the major works like Dam, Tunnel etc were awarded in year 1981.

I Unit of 50MW was commissioned on 30.1.2007 and the second unit was commissioned on 20.3. 2007.

2

Location Karbi Anglong district of Assam. 

Latitude 25.047'12"    

Longitude 92030'08"   Annual energy 390 MKWH   Project cost Rs 373.09 Cr  

KARBI LANGPI POWER PROJECT

Type Concrete gravity

Length 221m

Deepest foundation level 265.00m

Top elevation 319.50m

Crest level 300.00m

Spillway capacity 9950.00cumecs

DAM

LOW PRESSURE TUNNEL

Type Horse Shoe Shaped

Length 4430 m

Diameter 4.20 m

Capacity 57.00cumec

HIGH PRESSURE TUNNEL

Tunnel 2 numbers

Type Circular steel lined

Diameter 2.60m

Tunnel1 151.20m

Tunnel 2 166.20m

PENSTOCK TUNNEL

Tunnel 2 numbers

Diameter 2.60m

Tunnel 1 101.20m

Tunnel 2 89.50m

PENSTOCK

Penstock 2 numbers

Diameter 2.60m

Penstock 1 526.70m

Penstock 2 514.20m

POWER HOUSE

Type Over ground indoor type.

Maximum Head 240.00m

Average Head 235.00m

Maximum Utilizable discharge 57.00cumecs

Annual available energy 390 MKWH

Installation 2 Units of 50 MW each.

Type of turbine Francis , vertical Shaft

KOPILI POWER PROJECT

1

Built on river Kopili in the North Cachar Hills of Assam.

Was the first venture of NEEPCO in 1976.

Beneficiary states are Assam , Meghalaya ,Mizoram,Nagaland, Arunachal Pradesh, Tripura.

Head available is 326.50m.

Total Generation Capacity is 275 MW.

2

Dam and dyke systems are used.

One reservoir is on Kopili and one on Umrong(tributary). Khandong station uses Kopili water to generate 50 MW(2X25 MW) power.

Kopili station uses the tail water to generate 100 MW(2x50) power. Extended by setting up Unit III & Unit IV of 50 MW capacity each in 1997. Total installed capacity rose to 250 MW.

Khandong Unit I 8-03-1984 Khandong Unit II 3-05-1988 Kopili Unit I 4-07-1988 Kopili Unit II 21-07-1988 Kopili Unit III 5-03-1988 Kopili Unit IV 17-06-1988 KHEP Stage II 26 -07-2004

DATE OF COMISSIONING

Kopili Hydro Electric Stage II Power Station

PENSTOCK

Penstock 2 numbers

Diameter 2m

Length 890m

DAM

Type Concrete Gravity

Height 30m

Length 143m

HIGH PRESSURE TUNNEL

Diameter 4.6m

Length 825m

Lining Concrete

Diameter 4.0m

Length 300m

Lining Steel

LOW PRESSURE TUNNEL

Diameter 4.6m

Length 5.5km

Lining Concrete

STATUS OF GENERATION

Generation during September 2009 was 132 MU.

Generation in 2008-09 was 1171 MU.

Involves a 481m long conductor system.

Conductor system brings water from Khandong reservoir.

Power generated in the powerhouse is 25 MW.

Tail water goes to Umrong power station for utilisation in

Kopili hydro power station.

Kopili Hydro Electric Stage II Power Station

1

HEAD & POWER

Head 99m

Generated Power 25 MW

PENSTOCK

Penstock 2 numbers

Diameter 2.5m

Length 192m

TUNNEL

Diameter 4.5m

Length 2852m

Type Concrete lined

Diameter 4.5m Length 38m Type Steel lined

DAM

Type Concrete Gravity

Height 66m

Length 243m

SUBANSIRI HYDRO POWER PLANT

1

Built on river Subansiri at Gerumukh on Assam-Arunchal Pradesh border.

Is a run-off river project.

Biggest hydroelectric project undertaken in India so far.

Largest and longest tunnel in India constructed under the project.

1

Survey work and investigation commenced in the year 2001.

Estimated energy generation is 7241 MU. Total Capacity is 2000 MW ( 8x250 MW). Still under construction, expected to be completed by 2012. Project cost is about Rs. 6285.33 crores.

HEAD RACE TUNNEL

Tunnels 8 numbers Diameter 9.5m Shape Horse shoe Length 608m-1168m

DAM

Type Concrete Gravity

Height 116m

SURGE TUNNELS

Tunnels 8 numbers Diameter 9.5m Shape Horse shoe Length 400m-485m

PRESSURE SHAFT

Shafts 8 number

Shape Horse shoe

Diameter 9.5m-7m

TAIL RACE CHANNEL

Width 206m Length 35m

POWER HOUSE

Turbines 8 number

Capacity 8X 250 MW

Diameter 9.5m-7m