Palun Khola Hydropower Limited

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Salient Features of The project

1. Project Location: 
ProvinceKoshi Province
DistrictTaplejung
Intake SiteMikhawa Gaupalika
Powerhouse SiteMikhawa Gaunpalika
Geographical Coordinates 
Latitude27° 32′ 38″ N to 27° 33′ 55″ N
Longitude87° 37′ 16″ E to 87° 38′ 38″ E.
  
2. General: 
Name of RiverPalun Khola
Nearest TownTaplejung Bazar
Type of SchemeRun-of-River
Gross Head299.50 m
Net rated Head290.55 m
Installed Capacity21 MW
Dry Season energy (saleable)39.18 GWh
Wet Season Energy (saleable)86.06 GWh
Average          Annual  Energy  after          Outage (saleable)125.25 GWh
  
3. Hydrology: 
Catchment Area187.48 km2
Catchment Area Below 3000 masl15.23 km2
Catchment Area above 3000 and below 5000 masl158.26 km2
Catchment Area above 5000 masl14.00 km2
Design Discharge @43%8.69 m3/s
Riparian Release0.29 m3/s
Annual flood127.37 m3/s
Design flood at intake (1 in 100 Years)391.26 m3/s
Design flood at tailrace (1 in 100 Years)419.03 m3/s
Average Annual Precipitation2316.33 mm
  
4. Power and Energy: 
Rated net head290.55 m
Maximum rated net head298.68 m
Installed Capacity21 MW
Dry Season energy (saleable)39.18 GWh
Wet Season Energy (saleable)86.06 GWh
Average          Annual  Energy  after          Outage (saleable)125.25 GWh

Outage and Losses (Dry and Wet

season outages along with self-consumption and Flushing, repair and maintenance losses)

4% of Monthly Energy Generation
  
5. Weir and Stilling basin: 
Type of WeirSloping glacis free overflow concrete weir
Length of Weir (excluding under sluice)23.95 m
Crest ElevationEL 2099.50 masl
Weir Height (from U/S river bed)6.00 m
U/S  High  Flood  level  (100  years  return period)EL 2103.72 masl
Operation Platform ElevationEL 2104.70 masl
Stilling Basin Length35.00 m
D/S  High  Flood  level  (100  years  return period)EL 2093.45 masl
  
6. Undersluice: 
No. of Gates2
Under-sluice Opening (W X H)2.10 m x 2.10 m
Under-sluice Crest LevelEL 2093.0 masl
  
7.Intake Structure: 
Type of IntakeSide Intake (Orifice type)
No. of Opening2
Size of Orifice (W x H)4.10 m x 2.00 m
Intake Sill LevelEL 2096.50 masl
  
8. Gravel Trap: 
TypeHopper shaped
No. of Chamber1
Length7.50 m
Width of hopper at top9.40 m
Width of hopper at base2.20 m
Particle size to be trapped5 mm and greater
Gravel Flushing Culvert (W x H)1.20 m x 1.70 m
Length of Flushing Culvert38.23 m
  
9. Approach Culvert: 
TypeRectangular
No2
Length31.40m Each
Internal Dimension (W x H)2.00 m x 1.80 m
Longitudinal Slope1:500
Culvert invert level at startEL 2098.05 masl
Culvert invert level at endEL 2095.25 masl
  
10. Approach Tunnel: 
TypeInverted D shaped
No2
Length61.60 m Each
Internal Dimension (W x H)2.50 m x 3.20 m
Longitudinal Slope1:500
  
11. Desanding Basin: 
TypeUnderground Double Chamber with Reverse S4 Flushing
No. of Chambers2
Dimension (L)60.00 m (Effective Length)
Dimension (B)7.00 m of each bay
Dimension (H) (Average)12.10 m
Inlet Transition Length25.75 m
Normal Water LevelEL 2099.13 masl
Particle Size to be settled0.20 mm
Trapping Efficiency90%
Flushing Tunnel (W x H)Inverted D Type 2.0 m x 2.0 m (60.25m in Length)
Sediment Flushing Culvert (W x H)1.00 m x 1.70 m (106.20m in Length)
Length of Sediment Flushing Culvert105.90 m
Slope of Flushing1:100
  
12. Headpond: 
TypeRectangular
Length8.00 m
Number2 nos.
Size (W x H)8.00 m x 14.80 m
Normal Water LevelEL 2099.09 masl
  
13. Construction Tunnel: 
a.       Main Construction Tunnel 
TypeInverted D Shaped
Number1
Internal Dimension (W x H)3.20 m x 3.50 m
Length215.45 m
Support typesS3, S4, S5
b.       Adit Branch Tunnel 2 
TypeInverted D Shaped
Number1
Internal Dimension (W x H)3.20 m x 3.50 m
Length99.50 m
Support typesS3, S4
  
  
c. Adit Branch Tunnel 3 
TypeInverted D Shaped
Number1
Internal Dimension (W x H)3.20 m x 3.50 m
Length126.55 m
Support typesS3, S4, S5
  
14. Headrace Tunnel: 
a.       Link Tunnel 
TypeInverted D Shaped
Number2
Internal Dimension (W x H)3.20 m x 3.50 m
Length24.55 m each
Longitudinal Slope1:500
Support typesS3
b. Headrace Tunnel 
TypeInverted D Shaped
Number1
Internal Dimension (W x H)3.20 m x 3.50 m
Length2899.90 m
Longitudinal Slope1:500 and 1:400
Support typesS1, S2, S3, S4, S5, S6
  
c. Offset Tunnel 
TypeInverted D Shaped
Number1
Internal Dimension (W x H)3.20 m x 3.50 m
Length13.40 m
  
15. Surge Shaft: 
TypeCircular Shaft with Simple Orifice
Total internal depth24.60 m
Diameter (Main Shaft)8.00 m
Orifice dimensionsInverted D shaped 2.70 m X 3.25 m
Up Surge LevelEL 2105.45 masl
Down Surge LevelEL 2092.60 masl
Static Condition LevelEL 2099.50 masl
Normal Operational LevelEL 2099.50 masl
  
18. Generator: 
TypeSynchronous with horizontal shaft
Number of Units2 Nos.
Efficiency97%
Voltage11 kV
Power Factor0.85
Rated Output per unit12.88 MVA (+10% COL)
  
19. Transmission Line: 
Voltage Level132 kV
Length upto the Powerhouse of Mewa Khola HPP9 Km, Single circuit
Length from Powerhouse of Mewa Khola HPP to substation12 Km, Double circuit
  
20. Financial Indicators (Based on dry season price NRs. 8.40/KWh and wet season price NRs. 4.80/KWh) 
Project life30 years from the day of operation
B/C ratio on Project1.41
IRR on Project14.29%
B/C ratio on Equity2.17
IRR on Equity16.18%
Total cost of the project (Inclusive of VAT and Tax)NRs. 4,106,685,586.37
  
21. Construction Period:36 months

 

**Note:

  •  These salient features are based on the DPR report of Palun Khola Small Hydropower Project Prepared by HCE.
  •  Salient features of all alternatives are presented in Chapter 15 of this report.
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