Taksu Khola Hydropower Project (7.1 MW)

Nalsing Gad Hydropower Project is a storage project identified in the Jajarkot district by the government of Nepal to meet the current power demand and reduce the considerable power cut in the dry season by constructing a large storage project. To build a small hydropower project near the vicinity of the Nalsing Gad Hydropower project for the generation of construction power for a Nalsing Gad Hydropower Project, Nalsing Gad Hydropower Development Committee (NHPDC) procured feasibility and IEE study of the construction power project. 

Taksu Khola Hydropower Project is located in Jajarkot District in the mid-western development region of Nepal in Taksu Khola a tributary of the Bheri River in the Karnali Basin. Taksu Small hydropower project is a RoR type of project located in Dalli VDC of Jajarkot District. It has an installed capacity of 7.1 MW with a design discharge of 3.25 m3/sec based on Q40 criteria and a gross head of 260.2 m. 

Geographically the area lies between latitudes 28° 52' 23" N and 28° 53' 50" N and longitudes 82°26' 15” E and 82° 27' 20" E.

The project area location map is shown. 

Salient Features of Taksu Khola Hydropower Project (7.1MW)

1              Project Location

Province

:

Karnali

Zone

:

Bheri

District

:

Jajarkot

Intake Site

:

Nalgad Municipality-

Powerhouse Site

:

Nalgad Municipality-

Geographical Co-ordinates

 

 

Latitude

:

28º52'23" N to 28º53'53" N

Longitude

:

82º26'15" N to 82º27'20" N

Conservation Area (if appplicable)

 

 

2              General

Name of River

:

Nalgad river

Nearest Town

:

Jajarkot Khalanga Bazaar

Type of Scheme

:

Run of River

Gross Head

:

260.20m

Net rated Head

:

255.06

Installed Capacity

:

7.1MW

Average Annual Energy after Outage

:

42.02 GWh

Dry Season off-peak Energy

:

13.88 GWh

Wet Season Energy

:

28.13 GWh

3              Hydrology

Catchment Area

:

85.18 Km2

Mean Annual Discharge

:

6.23 m3/s

Design Discharge (at 40%PoE)

:

3.25 m3/s

Riparian Release

:

10% of monthly flow

Design Flood Discharge

:

93 m3/s (100 years return period)

Average Annual Precipitation

:

1663.97 mm

4              Diversion Weir/Dam for Pondage

Type of Weir

:

Broad crested concrete glacies

Length of Weir

:

13.70 m

Crest Elevation

:

1406.70 m

Spillway type

:

Ogee Shape

Undersluice Opening (W X H)

:

2.0 m X 2.0 m

Undersluice Crest Level

:

1402 masl

5              Intake Structure cum Gravel Trap

Type of Intake

:

Side Intake

Nos of Opening

:

2 nos.

Size of Intake (W x H)

:

2.20 m X 1.0 m

Intake Sill Level

:

1405.20

6              Approach Canal

Type

:

Box Culvert

No. of canal

:

2 nos.

Length

:

4.2 m

Size (W x B)

:

2.1 m X 1.50 m

7              De-sanding Basin

Type

:

Conventional, Gravitational

Dimension (L x B x H)

:

40 m X 4 m X 3.2 m

Inlet Transition Length

:

10 m

Particle Size to be settled

:

0.2 mm

Trapping Efficiency

:

90%

8              Headrace Tunnel

Type

:

Inverted D

Internal Diameter

:

2.5 m (height)

Length

:

2048 m

Type of Lining

:

Shotcrete and Concrete Lining

9              Surge Tank

Type

:

Circular

Effective Depth

:

42 m

Diameter (Or size)

:

1.3 m and 3.5 m

Up Surge Level

:

1413.00 masl

Down Surge Level

:

1400.00 masl

Normal Operation Level

:

1406.70 masl

10          Steel Penstock Pipe

Type

:

Mild Steel , Surface

Internal Diameter

:

1.20 m

Length

:

573.00 m

Steel Thickness

:

8.00 mm to 18.00 mm

Nos. of Anchor Blocks

:

8 nos.

Nos. of Saddle Supports

:

48 nos.

11          Powerhouse

Type

:

Surface

Size (L x W)

:

24 m X 19 m

Height

:

14 m

Turbine Axis Level

:

1145.2 m

12          Tailrace

Type

:

Concrete, Box canal

Tailrace Length

:

28 m

Size (W x D)

:

1.3 m X 1.3 m

Tailrace Water Level

:

1143 masl

13          Turbine

Type

:

2 Jet, Horizontal Axis Pelton Turbine

Number

:

2 units

Rated Output Capacity per unit

:

3.7 MW

Turbine Axis Level

:

1145.2 m

Net Head

:

255.19 m

Discharge per Unit

:

1.65 m3/s

Efficiency

:

91%

14          Generator

Type

:

Three phase, Cylindrical Rotor

Rated Output Capacity per Unit

:

4,176 kVA

Power Factor

:

0.85

Generation Voltage

:

11 kV

Frequency

:

50 HZ

No of Units

:

2

Excitation System

:

Brushless Excitation

Efficiency

:

96%

15          Transformer

Type

:

Three phase, oil immersed outdoor

Rated Capacity

:

9 MVA

Voltage Ratio

:

33/11 kV

No of Units

:

1

Vector Group

:

YND11

Frequency

:

50 HZ

Efficiency

:

99%

16          Transmission Line 

Voltage Level

:

33 kV single circuit line

Length

:

1 km Approx.

Conductor Type

:

ASCR Dog

From

:

Taksu Powerhouse

To

:

Chaukha Sub-station

 

 

 

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