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Bhote Koshi-5 Hydroelectric project (62MW)

SALIENT FEATURES OF THE PROJECT

GENERAL
1 Name of Project Bhotekoshi-5 Hydroelectric Project (BH-5)  
2 Type of the Scheme Cascade (MBKHEP-102MW)  
3 Gross Head 146.77 m
4 Net rated Head 136.01 m
5 Installed Capacity 62 MW
6 Average Annual Energy after Outage 339.098 GMh
PROJECT LOCATION
1 Latitude 27°45’33” to 27°49’08” N  
2 Longitude 85°51’49” E to 85°54’14” E  
3 Project Area Sindhupalchowk, Province-3  
4 Intake Site Jammu-9, Bahrabise Municipality  
5 Powerhouse Site Mankha-8, Balefi Rural Municipality  
6 Project Access 75 km from Kathmandu (Arniko Highway)  
TECHNICAL INFORMATION
1 Hydrology    
  Catchment Area (MBKHEP 2284 Km2
  Design Discharge (Q 42.5 ) 50.8 m3/s
  Design flood at headpond (1 in 100 Years) 1387 m3/s
  Design flood at tailrace (1 in 100 Years) 1544 m3/s
2 Diversion Weir No diversion weir  
3 Siphon Intake Tailrace of MBKHEP. BH-5 HEP will provide gate with clear opening of 4.4 m X 4.4 m  
  Bed Level 905.01 masl
4 Siphon    
  Type Box Culvert  
  Clear Opening 4.4 x 4.4 m2
  Length 87.80 m
  No. of Vertical Bends 4  
  No. of Horizontal Bends 3  
5 Settling Basin No settling Basin  
6 Approach Culvert    
  Length 71.09 m
  Internal Dimension    
  Width 4.40 m
  Height 4.40 m
7 Headpond    
  Length 54.23 m
  Clear Width 12 m
  Clear Height 14.35 m
  Free Board 1.56 m
  Working water level at Headpond 916.77 masl
  Head Pond invert level at HRT inlet 903.20 masl
  Top Level of head pond HRT 919.20 masl
8 Emergency Spillway    
  Crest level (concrete) 916.20 masl
  Crest level (rubber dam) 916.77 masl
  Length 308.13 m
  Width 10 m
  Depth 4.65 m
  Gradient 1 in 1200  
7 Headrace Culvert    
  Shape Rectangular  
  Length 14.23 m
  Dimension 5.2*5.2 m2
  Invert Level 903.30 masl
8 Headrace Tunnel    
  Shape Horse-shoe type  
  Total Length 7458.55 m
  Excavation Diameter 6.3 m
  Finished Diameter Varies From (5.1 to 6.1) m
  Gradient 1:425  
  Rock Trap(LXWXD) 20*8*5 m3
9 Adit Tunnel    
  Shape D-shaped  
  Excavation section size 4.2*4. 2 m
  Length 676.5 m
  Gradient 1 in 240 m
8 Surge Tunnel    
  Shape Horse-shoe Shaped  
  Finished Diameter 5.20 m
  Up surge Level 935.00 masl
  Down surge Level 898.00 masl
  Top level including freeboard 940.00 masl
9 Butterfly Valve at Outlet Portal    
  Butterfly Valve at Outlet Portal 4 m
  Air valve size Two (Size to be provided by HM supplier)  
8 Steel Penstock Pipe    
  Type Circular(Steel)  
  Diameter 4 m
  Length of Penstock Tunnel 110.40 m
  Length of Surface Penstock Pipe 322.35 m
  before bifurcation 300 m
  bifurcation length 22.35 m
  Steel thickness 14 to 36 mm
  Ultimate tensile stess of steel 510 N/mm2
9 Power House    
  Type Surface  
  Size 43.78*18.80 m2
  Height from machine floor 20.11 m
  Control Building size 24.62*10.1 m2
  No. of units 2  
10 Trailrace    
  Type Box culvert  
  Tail water level 769.94 masl
  Size 60*4.68 m2
  Slope 1 in 1200  
11 Turbine    
  Type Vertical shaft Francis Turbine  
  No. of units 2  
  Rated output capacity 33 MW
  Peak Efficiency 94%  
  Speed 375 rpm
12 Governer    
  Type Electric Governer  
  Adjust for speed drop Fully automatic hydraulic system  
13 Generator    
  No of units 2  
  Efficiency 97%  
  Voltage 11 kV
  Power Factor .85  
  Rated output per unit 37.367 MVA
14 Transformer    
  Type Outdoor, 3 Phase, 50Hz  
  Rated Capacity 35 MVA
  Voltage Ratio 132kV/11kV  
  No of units Two  
  Vector Group Ynd11 MVA
  Efficiency 99%  
15 Transmission Line    
  Voltage Level 132 kV, Double circuit  
  Length 4 Km
  Conductor Type ASCR "BEAR"  
  From Powerhouse  
  To NEA Proposed Barhabise substation  
16 Project Access Road    
  Class District Rural Road Class "A" (DDRA)  
  Length to reach    
  Adit Tunnel 0.9 Km
  Surge Portal 1.2 Km
FINANCIALS
1 Total Project Cost (including Interest During Construction) NRs. 11.438 Billion  
2 Interest Rate (including hedging cost ) 10%  
3 Project IRR 14%  
4 Project Benefit-Cost Ratio 1.66