Sunday April 21, 2019  |    | 

Upallo Khimti

Upallo Khimti Hydropower Project is located in Ramechhap district of Nepal. The project components are located in right bank of Khimti Khola within Chuchure VDC. The project site was first identified by Himalaya Urja as very attractive project for development on 2003. The development history of the project is long and has pased many stages of development. The First lincese was obtained in Mansir 2061 B.S. for 4.6MW capacity. There were several studies in the due course of time. The final feasibility study defining 12MW capacity was made on 2011 carried out by Spark Consult (p) Ltd. The same document was used for power evacuation, connection agreement, PPA reference and IEE study. The company has obtained the generation lincese for the construction of the project after obtaining the financial closure with limited available time.

Upallo Khimti Hydropower Project is a run-of-river type of project. The installed capacity of the plant shall be 12.0 MW corresponding to net head of 285.84m and design discharge of 5.16 m3/s (as per PPA but could be 0.5MW increased by head increment) designed at Q40%. The main components of the projects are headworks, connecting canal, gravel trap, desander, headrace pipe, surgetank, penstock Pipe, powerhouse, tailrace, switchyard, 132kV transmission line and interconnection facilities required for power evacuation of the project. The headwork of Upallo Khimti HP is located at 150m downstream of the confluence of Khimti Khola with Ghwan khola.

There is gravel trap and desander at left bank of Khimti Khola followed by a side intake with orifice to control entry of debris. There is headrace pipe of 3.675 km long to the junction with pipe from Surgetank. The connecting orifice pipe is 506m long from the T-junction to Lower Surgetank Bell mouth. There will be two surgetanks each serving for lower and upper surge level. There will be 297m long penstock from the T-junction, which supply water to powerhouse having two units of Pelton turbines with an outdoor switchyard. The power from project shall be transmitted to 132kV Garjang substation with 3.2km long 132 kV single circuit line. The power shall be evacuated through 132kV transmission line towards Khimti S/S further from Garjang 132kV s/s. There will be metering facilities in Garjang substation to collect to INPS. There will be communication and camping facilities with local setup sufficiently for operation of the project.



Salient Features of the Project

 

 

 

 

 

 

 

 


Project Location

  • Project Name:
  • District:
  • Location of Project Site:
  • Longitudes:
  • Latitudes:
 
  • Upallo Khimti Hydropower Project
  • Ramechhap
  • Chuchure VDC
  • 86o19' 20" E and 86o21' 40" E
  • 27o39' 24" N and 27o41' 54" N

Project Details

  • Water Source:
  • Type of Scheme:
  • Installed Capacity:
  • Gross Head:
  • Rated Design Head:
  • Design Plant Discharge:
  • Annual Energy after Outage:
 
  • Khimti Khola
  • Run off River
  • 12.0 MW
  • 300.23 m
  • 285.84 m
  • 5.16 m3/sec
  • 73.61 GWh

Hydrology

  • Catchment Area Khare:
  • Average Precipitation:
  • 100 years Design Flood (HW):
  • 100 years Design Flood (PH):
  • Construction Flood Intake:
  • Design Discharge:
 
  • 73.0 sq km
  • 3402 mm/year
  • 102 m3/sec
  • 173 m3/sec
  • 28.4 m3/sec
  • 5.16 m3/sec (Q40%)

Headworks

  • Diversion Structure:
  • Length of Weir:
  • Weir crest Elevation:
  • Height of Weir:
  • Under sluice:
  • Crest of Sluice:
  • Size of Sluice Gate (b x h):
  • Intake Type:
  • Size of Opening:
  • Crest Elevation of Intake:
 
  • Hard Stone Lined Gravity Free Flow Weir
  • 22.0 m
  • EL 2303.2 msl
  • 2.50 m from U/s Apron
  • 1 Vertical Sluice Gate
  • EL 2300.75 msl
  • 2.5 m x 2.0 m
  • Side Intake
  • 2.2 x 0.9 - 3 nos
  • El 2302.45 msl

Gravel Trap

  • Type:
  • Particle Size to be settled:
  • Trap Efficiency:
  • Size of Gravel Trap:
  • Spillway Length:
  • Bed Slope:
  • Flushing Channel Size:
 
  • Rectangular
  • 20 mm
  • 98%
  • 4.0 m x 20 m – 3.5 m; 15 m
  • 8 m
  • 1:10
  • 1. 0 m x 0.8 m Rectangular Closed

Desander

  • Type:
  • Particle Size to be settled:
  • Trap Efficiency:
  • Size of Desander:
  • Bed Slope:
  • FSL @ Desander end:
  • Flushing Channel Size:
 
  • Dufour Double Chamber Continuous Flushing Type
  • 0.20 mm
  • 93%
  • 2 Chamber each of 6 m x 4 m; 55 m
  • 1:50
  • 2300.05 msl
  • 0.8 m x 0.8 m Rectangular

Headrace Pipe

  • Total Length:
  • Type:
  • Pipe Material:
  • Diameter of Pipe:  
  • Average Pipe slope:
  • Nos. of Anchor Block:
  • No of Simple Support:
  • 3675 m
  • MS-Pipe Buried section
  • IS 2062-B
  • 1.7-1.5m, 8 mm – 22 mm Thickness
  • 1:17
  • 48 nos.
  • 313 nos.

Surge Tank

  • Type:
  • Construction:
  • Lower Tank Size:
  • Upallo Tank Size:
  • Bottom Level Upallo Tank:
  • Bottom Level of tank:
  • Static Level:
  • Upallo Surge Level:
  • Down Surge Level:
 
  • Rectangular (Two tank)
  • Concrete (RCC)
  • 9mX6mX6.2m (internal dimension)
  • 15mX9mX6.0m (internal dimension)
  • 2287.306 m
  • 2302.904 m
  • 2303.0 m
  • 2308.544 m
  • 2388.624 m

Penstock Pipe

  • Type:
  • Pipe Material:
  • Size of Pipe:
  • Number of Anchor Blocks:
  • Number of Saddle Supports:
  • Length:
    •   Towards surge Tank
    •   Towards powerhouse
    •   Connecting Pipe between ST
 
  • MS- Pipe Open Sections
  • IS 2062-B
  • 1.5-1.44 m dia, 8 mm – 28 mm
  • 19 nos. including T, Y, B, and A
  • 30 Nos
  • 839m
    • 506.5m
    • 297m
    • 35.5m

Power House

  • Type:
  • PH Dimension (l x b):
  • Height of PH Building:
  • PH Floor Level:
 
  • Surface type
  • 31.6 m x 9.6 m (internal dimension)
  • 9.6 From floor Level
  • EL. 2002.97 m

Tailrace

  • Type:
  • Size (w x h):
  • Length:
  • Rectangular RCC
  • 1.60 m x 2 each
  • 12m (Connecting to head pond of D/s Project)

Turbine

  • Number of Units:
  • Type of Turbine:
  • Shaft Arrangement:
  • Rated Discharge for each Turbine:
  • Rated Head:
  • Rated Output for each Unit:
  • RPM:
  • Rated Efficiency:
  • 2
  • Pelton
  • Horizontal
  • 2.58 m3/s
  • 285.84 m
  • 6250 kW
  • 750
  • 90%

Generators

  • No of Units:
  • Generator Type:
  • Rated Voltage:
  • Power Factor:
  • Layout:
  • Rated Efficiency:
  • Rated Output:
  • Rated Frequency:
  • 2
  • Synchronous brushless, 3Ø AC
  • 6.3 kV
  • 0.85
  • Horizontal
  • 96 %
  • 7060 kVA
  • 50 Hz

Power Transformer

  • Type:
  • Rated Efficiency:
  • Rated Capacity:
  • No of Unit:
  • Number of Phases:
  • Types of Connection:
  • Type of Cooling:
  • Overload Capacity:
  • Voltage Ratio
    • Primary (LV Side):
    • Secondary (HV Side):
  • Step up Power Transformer
  • 99%
  • 15000 kVA
  • 1
  • 3 ph, 50 Hz
  • Star/Delta
  • ONAN
  • 120% for 4 Hrs
  •  
    • 132 kV
    • 6.3 kV

Station Supply Transformer

  • Type:
  • Rate Power Output:
  • No of Unit:
  • Type of Cooling:
  • Voltage Ratio:
  • Connection /Vector Group:
  • Indoor Type
  • 200 kVA
  • 2
  • ONAN
  • 6.3/0.4 kV
  • Dyn11

Transmission and Interconnection

  • Power House to Garjang 132kV S/S:
  • Type of Circuit:
  • Line Conductor:
  • Transmission Voltage:
  • Proposed Interconnection Point:
 
  • 3.2 km
  • Single Circuit Line
  • ACSR Wolf 150 mm2
  • 132 kV
  • Garjang 132kV Substation

Power and Energy

  • Installed Capacity:
  • Total Deemed Generation:
  • Dry Energy:
  • Wet Energy:
 
  • 12.0 MW
  • 73.61 GWh
  • 13.03 GWh
  • 60.58 GWh

Financial Indicator

  • Base Cost of the Project:
  • Loan/Equity Ratio:
  • Loan Interest Rate:
  • Internal Rate of Return (IRR):
  • B/C Ratio:
  • Equity Rate of Return (EIRR):
  • Simple Payback Period:
  • Cost per kW:
  • Cost After Financing:
  • Cost After Financing:
 
  • NRs 1704.629 million (without IDC)
  • 75:25
  • 11%
  • 15.0%
  • 1.37
  • 23.1 %
  • 5.7 Years
  • US $ 1595/kW (1 US $ =NRs. 100)
  • NRs 1914.122 million (with IDC)
  • Rs 15.95 Crore/MW


  • Construction Period:
  • 3 Years

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