Likhu 2 is a run-of-river scheme that diverts 26.4 m3 of water through a 5.25 m high diversion
weir and further through a 6.57 km underground water conductor system to the powerhouse.
Here, utilizing a net head of approximately 229.53 meters, we are able to generate up to 60.5
MW (with overloading).
Project Description
Description
Symbol
SI
Unit
Design Discharge
Qd
26.4
m3 /sec
Gross Head
247.25
m
Net Head
Hn
229.53
Meters
No. & Type of Units
2*22 MW + 1*11 MW
3
Horizontal Francis
Turbine Efficiency at QD
ŋT
95
%
Generator Efficiency
ŋG
97.5
%
Transformer Efficiency
ŋTr
99
%
Result
Gross Power
PG
55
MW
Annual Energy
EA
242.37
GWh
Key Technical and Financial Feature
General
Total Project Cost
NPR 1076.35 cr (US$ 81.54 M)
Unit Cost of
Generation
NPR 19.56 cr (US$ 1.44M) / MW
EIRR
12.15 %
Period of
Construction
48 Months
Project Layout
Right Bank of Likhu
Catchment Area
346 km2
Head Race Tunnel
Type
Low Pressure Tunnel
Section Type
Inverted D
Finished Diameter
3.4 / 4.2 m
Support Type
Shotcrete / Concrete Lined
Ungated Weir
Weir Height
5.25 m
Length of the
Weir crest
44.4 m
Design Flood (1 in
100 Yr)
479 m3 / sec
Power House
Type
Surface
Size (L * W* H)
44 x 20.25 x 35 m
Tail race
299.14 x 5.5 x 3 m
Transmission Line
132 kV, Double circuit; 5.5
km with Li 1 & Li 2 sharing
the cost.
Connecting Sub-
Station
Likhu A Switchyard
Salient Features
General
Period of Construction
Months
Project Layout
Right Bank of Likhu
Catchment Area
346 km2
Weir location
Marbu
Powerhouse location
Thado Khola
Head Race Tunnel
Type
Low Pressure Tunnel
Section Type
Inverted D
Length
6465 m
Finished Diameter
3.4 / 4.2 m
Support Type
Shotcrete / Concrete Lined
Surge Shaft
U/G, restricted orifice
Internal Diameter / Height
2.5×86/4.5×47 m/4.9×47.5 m
Leading to an
Underground PPV
Intake
Type
Side Intake
No. of Chambers / Size
3 No. / 3.25 * 3.2 m
Crest Elevation of Intake
1724.75 m
Feeder Channel is
Open
Length of Feeder Channel
24.95 m
Desilting Basin
Type
Open, Surface
No. of Bays
2 (Two)
Length
75 m
Total Width / Depth
16.5 m / 7.25 m
Transmission Line
Voltage
132 kV
Length
5.5 km
Conductor Type
ASCR BISON
Ungated Weir
Weir Height
5.25 m
Length of the
Weir crest
27.0 m
Foundation Level U/S
1719 masl
Minimum reservoir level
1723.5 masl
Silt Pressure is Upto
1720.6 masl
Weir Top Level [Design Flood]
1724.75 m
Tail water level (Min.)
1722.28 m
Design Flood (1 in
100 Yr)
479 m3 / sec
Pressure Shaft
Type
U/G Inclined & Horiz.
Total Length
514.5 m
Diameter
2.5 m (steel lined) 3.5 m (excavated)
Bifurcation Length
12.5, 15.6, 15.5 m
Bifurcation Diameter
1.5, 1.5 & 1.1 m
Power House & Tail Race
Type
Surface
Size (L * W* H)
44 x 20.25 x 35 m
Capacity
55 MW (Original Capacity)
Tail race of
299.14 m long Box Culvert
Tail Water Level
1477.26 m
Transmission Line
132 kV, Double circuit; 30.4 km
with Li 1 & Li A sharing the cost
