Upper Chaku 'A' Hydroelectric Project 22.2 MW

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Upper Chaku A Hydroelectric Project

Upper Chaku A Hydroelectric Project is run-of-river (RoR) project with installed capacity 22.2 MW (2x11.1 MW) developed by Shivashree Hydropower Limited. It utilizes the water of chaku Khola at an elevation of 2178 masl which flows between Phulpingkatti VDC and Marming VDC (currently both Bhotekoshi Rural Municipality) of Sindhupalchowk Disctrict. The catchment area of the project at headworks site is 41.2 km2 . The project is around 100 km north east from kathmandu and the powerhouse of the project is located approximately 2 km upstream from the confluence of Chaku Khola and Bhotekoshi River at Chaku Bazar .

The design discharge of the project is 3.25 m3/s and gross head of the project is 815.5 m . The geographical coordinates of the project as per the generation license issued by Department of Electricity Development (DoED) is located in between Longitudes 85° 56’ 00’’ to 85° 58’ 06’’ and Latitudes 27° 51’ 31’’ to 27° 52’ 31’’. The headrace tunnel of the project is 2509 m long with finished size of 2.5 m x 2.5 m and Inverted D Shape which discharge the water to 8m diameter and 16m high surface surge tank at outlet. The penstock of the project is 1500m and diameter of penstock ranges from 1.6 to 1.2 m upto bifurcation with 10mm - 36 mm thickness. After bifurcation, the penstock splits into 2 pipes of 0.8 m diameter and hit the two turbines in the powerhouse. The powerhouse is surface type located on the right bank of Chaku Khola with 2 nos of 11.1 MW horizontal axis pelton turbines and corresponding generators and transformers of 15 MVA and 16 MVA respectively. The project will generate 118 GWh of annual energy which is being delivered to Lamosanghu Substation through 22 km long 132 KV Transmission Line as per the Grid Connection Agreement concluded with Nepal Electricity Authority(NEA) on 31st Baisakh, 2067.

The project is now in operation stage. The commercial operation date (COD) is 1st Jestha 2078.

1 General  
  Project name Upper Chaku 'A' Hydroelectric Project
  Installed capacity 22.2 MW
  Name of River Chaku Khola
  Gross head 815.5 m
  Location Bhotekoshi Rural Municipality of Sindhupalchowk District
  Geographical Coordinates 27°51’31” N and 27°52’31” N
85˚56’00” E and 85˚58’06”E
  Type of project Run-of-River (RoR)
  Nearest Settlement Area Chaku Bazar
  Accessibility Approximately 100 km from kathmandu through araniko highway and 2 km from chaku bazar
2 Hydrology  
  Catchment Area at Intake 41.2 km2
  Catchment Area at Powerhouse 57 km​2
  Design Discharge 3.25 m3/s
  Mean monthly flow Kaligandaki River 4.63 m3/s
  Design Flood (100 Years Return Period) 130 m3/s
3 Weir and Undersluice  
  Type of weir Ungated, Boulder Armouring
  Length of Weir 27 m
  Weir Crest Level 2178.0 masl
  Height of Weir 5.0 m
  No. of Undersluice 1 no
  Undersluice Size (BxH) 2.7 m x 2.5 m
  Type of Undersluice Gate Vertical
4 Intake and Trashrack  
  Type Side Intake, Orifice Type
  No of Opening 3
  Size of Opening (BxH) 2.20 m x 1.35 m
  Sill Level 2175.80 masl
5 Trash rack  
  Inclination 75 ° with the horizontal
  Sill Elevation 2176.0 masl
  Clear opening between trash bars 50 mm
  Size of Trash rack (BxH) 2.0 m x 1.3 m
6 Gravel Trap  
  Size (LxBxH) 20 m x 7 m x 3 m
  Flushing System Continuous during monsoon
  Bed Slope 1:30
7 Settling Basin  
  Size 70 m x 7 m x 5.75 m
  No. of Chambers Double
  Design Particle size 0.1 mm
  Traping Efficiency 90 %
  Flow velocity in the basin 0.14 m/s
  Flushing System Intermittent, Hydraulic Flushing
  Bed Slope 1:50
  Inlet Transition Length 20 m
     
8 Headrace Pipe  
  Length 200 m
  Diamter of Pipe 1.6 m
  Thickness 8 mm
  No. of Anchor Blocks 7
     
9 Headrace Tunnel  
  Shape Inverted D-shaped
  Size 2.5 m x 2.5 m
  Length 2504 m
  Support Type concrete and shotcrete lined with rockbolts
  Longitudinal Slope 1:1000
     
10 Adit Tunnel  
  Shape Inverted D-shaped
  Size 2.5 m x 2.5 m
  Length 118 m
     
11 Surge Tank  
  Type Restricted,Orifice
  Shape Circular
  Internal Diameter 8 m
  Height 18 m
     
12 Penstock Pipe including shaft tunnel  
  Length of Penstock pipe 1524 m (including tunnel shaft)
  Diameter 1400 mm to 800 mm
  Thickness 8 mm to 36 mm
  Nos of Anchor Blocks 21 nos
  Nos of Manhole 4 nos
  No of Expansion Joint 13 nos
  No of Reducer & Bifurcation 2 nos of reducer and 1 no of bifurcation
  Vertical Shaft Diameter 2.5 m
  Inclined Shaft Tunnel Inverted D shaped
  Size of Inclined Shaft 2.5 m x 2.5 m
  Length of tunnel shaft 357 m (Horizontal 85 m+ Inclined 226 m + Vertical 46 m)
     
13 Powerhouse  
  Type Surface
  Overall Dimensions (LxWxH) 38.0 m x 14.8 m x 16.5 m
  Turbine runner axis elevation 1362.5 masl
     
14 Transmission line  
  Length 22 km
  Voltage Level 132 KV
  Conductor ACSR BEAR
  Substation Lamosanghu SS
15 Tailrace Canal  
  Type/Shape RCC/Rectangular
  Main Canal Length 35 m
  Slope 1:100
16 Turbine  
  Type Horizontal Axis Pelton
  Speed 750 rpm
  No. of units 2 nos
  Capacity per unit 11.1 MW
17 Generator  
  Type Water cooled, Synchronous 3-Phase
  Specification 50 Hz, 0.85 power factor, 13 MVA x 2 Nos.
  Voltage Level 11 KV
18 Transformer  
  Type 3-Phase, ONAN,Outdoor
  Nos of Tranformer 2 nos
  Rated Capacity 14.5 MVA
  Voltage Level 11 KV/132KV
19 Power and Energy  
  Installed Capacirty 22.2 MW
  Dry Energy (Kwh) 18,486,149
  Wet Energy (kwh) 99,595,344
  Total Annual Energy (Kwh) 118,081,493