Likhu A is the furthest downstream of the three projects.
Likhu A is a run-of-river scheme that diverts 24.1 m3 of water through a 44.4 m long diversion
weir and further through a 2.97 km underground water conductor system to the powerhouse.
Here, utilizing a net head of approximately 138.55 meters, we are able to generate up to 33.66
MW (with overloading).
Project Description
Description
Symbol
SI
Unit
Design Discharge
Qd
24.1
m3 /sec
Environmental Flows
Qe
0.568
m3 /sec
No. & Type of Units
2*12 MW+ 1*5.04 MW
3
Horizontal Francis
Net Head
Hn
138.55
Meters
Turbine Efficiency at QD
ŋT
%
Result
Gross Power
PG
29.04
MW
Annual Energy
EA
149.62
GWh
Key Technical and Financial Feature
General
Total Project Cost
NPR 623.07 cr (US$ 47.09 M)
Unit Cost of
Generation
NPR 21.45 cr (US$ 1.62M) / MW
EIRR
16.44 %
Period of
Construction
48 Months
Project Layout
Left Bank of Likhu
Catchment Area
421 km2
Head Race Tunnel
Type
Low Pressure Tunnel
Section Type
Inverted D
Finished Diameter
3.4 / 4.2 m
Support Type
Shot / Concrete Lined
Ungated Weir
Weir Height
11.5 m
Length of the
Weir crest
44.4 m
Design Flood (1 in
100 Yr)
402 m3 / sec
Power House
Type
Surface
Size (L * W* H)
42.6 * 12.1 * 23.5 m
Tail race
29.04 MW
Transmission Line
132 kV, Double circuit; 7.1
km with Li 1 & Li 2 sharing
the cost.
Connecting Sub-
Station
New Khimti
Salient Features
General
Period of Construction
58 Months
Project Layout
Left Bank of Likhu
Catchment Area
421 km2
Weir location
Rangda
Powerhouse location
Buku Doban
Head Race Tunnel
Type
Low Pressure Tunnel
Section Type
Inverted D
Length
2523 m
Finished Diameter
3.4 / 4.2 m
Support Type
Shotcrete / Concrete Lined
Surge Shaft
U/G, restricted orifice
Internal Diameter / Height
6 m / 29.30 m
Leading to an
Underground PPV
Intake & Feeder Channel
Type
Side Intake
No. of Chambers / Size
3 No. / 4.5 * 3.3 m
Crest Elevation of Intake
1447.50 m
Feeder Channel is
Open
Length of Feeder Channel
107.7 m to 2 nos 27.45
Desilting Basin
Type
Open, Surface
No. of Bays
2 (Two)
Length
60 m
Total Width / Depth
28.5 m / 8.9 m
Transmission Line
Voltage
132 kV
Length
30 km
Conductor Type
ASCR BISON
Ungated Weir
Weir Height
11.5 m
Length of the
Weir crest
44.4 m
Foundation Level U/S
1439.5 masl
Minimum reservoir level
1451 masl
Silt Pressure is Upto
1450.50 m
Weir Top Level [Design Flood]
1453.75 m
Tail water level (Min.)
1441 m
Design Flood (1 in
100 Yr)
636 m3 / sec
Pressure Shaft
Type
U/G Inclined & Horiz.
Total Length
447.23 m
Diameter
2.5 m (steel lined) 3.5 m (excavated)
Bifurcation Length
18.7, 15, 11.2 & 18.5 m
Bifurcation Diameter
1.5, 1.9, 1.5 & 1.1 m
Power House & Tail Race
Type
Surface
Size (L * W* H)
42.6 * 12.1 * 23.5 m
Capacity
29.04 MW (Original Capacity)
Tail race of
30 m long Box Culvert
Tail Water Level
1301.31 m
Transmission Line
132 kV, Double circuit; 29.4 km
with Li 1 & Li 2 sharing the cost
