Khani Khola Hydropower Company Limited

  khanikhola.hpc@gmail.com   + 977-01-4436325

Salient Features TUNGUN – THOSNE HYDROPOWER PROJECT – 4.36 MW

1. Project Details

Development Region Central Development Region
District Lalitpur
Location of Project Site Bhattedanda, Sankhu VDC
Water Source Tungun and Thosne Khola
Type of Scheme RoR
Access Road Kanti Rajpath
Maximum Capacity 4362 kW
Gross head 167.6 m
Rated Design head 164.7 m
Design Discharge 3.18 cumecs

2. Hydrology THOSNE KHOLA (Main, Tributary 1)

River Main River
Catchment Area at Intake 48 sq km
Average Precipitation 3000 mm/year
Minimum Monthly flow 0.421 m3/sec
Max Contribution to Design Discharge 3.18 cumecs
100 year flood at headwork 254 cumecs

TUNGUN KHOLA (Collection, Tributary 2)

Catchment Area at Intake 41 sq km
Average Precipitation 3000 mm/year
Minimum Monthly flow 0.378 m3/sec
Max Contribution to Design Discharge 1.15 cumecs
100 year Flood at Headworks 228 cumecs

3. Collection Headworks in Tungun

Purpose Collection Intake for low flow only
Diversion structure Stone lined free flow weir
Length of weir 20m
Weir crest elevation EL 1142.7 msl
Height of weir 1.5m
Under sluice 1 Vertical Sluice gate
Crest of Sluice EL 1141.29msl
Size of Sluice gates (bxh) 1.5m x 1.5m
Intake Type Side Intake with course rack
Size of opening 2.0x 0.7x 2 nos
Crest elevation of Intake EL1142.2 msl

4. Connecting Channel (Tungun HW)

Canal Type Rectangular RCC closed canal
Dimension (width x height) 1.2 m x 1.0m
Length of Channel 85.17 m
Bed Slope 1:250

5. Desander (Tungun)

Type RCC Rectangular x 2 basins
Dimension (width x height) 2.4 m x2.2-2.6 m
Length of effective basin 24 m
Length of Inlet Transition 12 m
Length of outlet Transition 6 m
Bed Slope 1in 50
Particle to settle 0.50 mm

6. Collection Headrace Pipe (Tungun to Thosne Collection)

Total Conveyance 3452.00 m
Type Mild Steel Welded Pipe
Diameter 0.9m Internal Dia
Thickness of Pipe 6mm
Average Pipe slope 1:250
No of Air release Valve 1
No of Wash Plug 1
No of IP 51

7. Headworks at Thosne Khola

Diversion structure Stone lined free flow weir
Length of weir 16m
Weir crest elevation EL 1126.2 msl
Height of weir 1.2m
Undersluice 1 Vertical Sluice gate
Crest of Sluice EL 1124.2 msl
Size of Sluice gates (bxh) 2m x 1.5m
Intake Type Side Intake with Double Orifice
Size of opening 1.7x 1.0x 3 nos
Crest elevation of Intake EL1125.4 msl

8. Connecting Channel (Thosne HW)

Canal Type Rectangular RCC closed canal
Dimension (width x height) 2 m x 1.2m
Length of Channel 17.5 m
Bed Slope 1:250

9. Gravel Trap

Canal Type Rectangular RCC Channel
Dimension (width x height) 4.3x 1.4-2.4 m
Bed Slope 1:15
Length of Gravel Trap 18 m
Particle to settle 20 mm

10. Desander (Thosne)

Type RCC Dufore x 2 basins
Dimension (width x height) 5.0 m x 4.2-5.3 m
Length of effective basin 52 m
Length of Inlet Transition 10.5 m
Length of outlet Transition 6 m
Bed Slope 1in 50
Particle to settle 0.20 mm
Trap Efficiency 93%

11. Headrace Tunnel

Tunnel Type Free Flow Inverted D type 2.0m dia
Type of lining Shotcrete Lined
Flow Section 2x1.2 rectangular
Slope of HR tunnel 1:500
Length of Tunnel 588m
Rock Trap 10m

12. Forebay Tank

Type Rectangular sump with extension on Tunnel
Construction Concrete Lined at joint of pipe with bellmouth
Dimension 10.8x 4x 1.2-4.5m
Height of the tank from Invert level 8.7m
Invert Level 1120.30m

13. Penstock Pipe

Type Welded Surface Penstock
Pipe Material Mild steel confirming to IS 2062-B
Length of penstock 285m
Size of Pipe 1.424-1.0m, 8-14mm thick
Supports S/M Support with Concrete cap
Number of supports 20 nos
Number of Anchor Blocks 7 nos. including Y

14. Power house & Switchyard

Type Surface with outdoor switchyard
PH dimension (l x b) 35 x 10.8 m
Height of PH building 9 m
PH Floor level EL. 957.46 m
Switchyard Outdoor type (25x12m)

15. Tail race

Type Rectangular RCC
Size 2x1.6 m
Length 12m
Tailrace canal invert level EL 954.59 m

16. Turbine

Number of Units 2
Type of Turbine Pelton
Shaft Arrangement Horizontal
Rated discharge for each turbine 1.59 m3/s for each units
Rated Head 164.7m
Rated Output for each unit 2300 kW each unit
RPM 600
Rated Efficiency 89%
Speed Governor Electro-Hydraulic

17. Generators

No of units 2
Generator Type 3 ph AC Synchronous
Excitation Brushless excitation
Rated Voltage 6.3 kV
Power Factor 0.8
Layout Horizontal
Rated Output 2700 kVA each
Rated Frequency 50 Hz

18. Power Transformer

Type Outdoor type, Oil Immersed
Capacity 5600 kVA
Quantity 1
Number of Phases 3 ph, 50 Hz
Type of Cooling ONAN
Voltage Ratio
Primary (LV Side) 6.3 kV
Secondary (HV Side) 33 kV

19. Station Supply Transformer

Type Outdoor type
Capacity 100 kVA
Quantity 1
Number of Phases 3 ph, 50 Hz
Type of Cooling ONAN
Voltage Ratio 33/0.4 kV
Connection /Vector Group Dyn11

20. Transmission Line Lagankhel Option

Transmission Length Tungun-Thosne PH- Unichaur SS 7.708km
Unichaur SS- Lagankhel SS 20.318 km
Transmission Voltage 33 kV
Type of Circuit Single circuit line up to Lagankhel SS
Interconnection Voltage 11 kV
Proposed Interconnection Point NEA 66/11 kV, Substation at Lagankhel
Line Conductor ACSR, 100 mm2

Kulekhani Option

Transmission Length Tungun-Thosne PH- Khani PH 2.5km
Khani PH – Kulekhani SS 21km
Transmission Voltage 33 kV
Type of Circuit Single circuit line up to SS
Interconnection Voltage 66kV
Proposed Interconnection Point NEA 66kV, Switchyard at KL-1
Line Conductor ACSR, 100 mm2

21. Power and Energy

Installed Capacity 4.3 MW
Deemed Energy 22.92 GWh
Dry Season Energy (four months) 3.25 GWh
Wet Season Energy (eight months) 18.30 GWh

22. Development & Construction Period

1+2 years

23. Financial Indicators

Base Cost of the ProjectNRs 584.465 million (with IDC) Considering Connection at KL1 and cost shearing with Laxmi Cement)
Loan/Equity Ratio 11 %
IRR 13.76%
B/C Ratio 1.23
EIRR 17.33 %
Simple Payback Period 6.5 years
Cost per kW U$ 1865 (1 US $ = NRs. 77)

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