Salient Features of The project

General:

Name of the project

Tamor Khola-5 Hydropower Project

Developer

River Side Hydro Energy Pvt. Ltd.

Name of the River

Tamor River

Project Type

Run-of-River

Province

Province 1

District

Taplejung

 Latitude

27°30’25” N to 27°31’48” N

Longitude

87°47’01” E to 87°48’33” E

Rural Municipality

Phaktanglung

Nearest Town

Phungling

Hydrology:

Catchment Area

1511.6 km²

Design Flow

47.5 m³/s (47.23% exceedance flow)

90% Exceedance flow

13.64 m³/s

Design Flood (Q100)

2044.20 m³/s

Diversion Dam:

Type

Concrete gravity dam

Geometry

Ogee-profile

Crest Elevation

1496.00 m amsl

100 yrs Flood Energy Level

1504.18 m amsl

Crest Length

53 m

Maximum height

9 m (from the original ground level)

River Bed Level at Weir Axis

1487.00m amsl

River Diversion During Construction:

Construction Flood

310 m³/s (20-year dry season flood)

Undersluice:

Type

Radial Gates

Numbers

2

Invert Elevation

1487 m amsl

Size (B X H)

4.5 m X 4 m

Intake:

Type

Submerged

Number of Orifices

4

Sill Elevation of Orifice

1491.20 m amsl

Top Elevation of Orifice

1494.60 m amsl

Size (B X H)

5 m X 3.4 m (each)

Trash Passage:

Size (B X H)

2 m (B) X 4 m (H)

Length

28 m

Gravel Trap:

Type

Rectangular   Hopper Type, RCC (Continuous flushing)

Particle size to be settled

5 mm

Number of Chambers

1

Width (each)

13 m

Height

9.1 m

Length

15.00 m

Gravel Flushing Culvert:

Type

Circular, MS Steel pipe

Number of Chambers

1

Internal diameter

1.5 m

Length

36.0 m

Emergency Spillway:

Crest length

24m

Maximum Capacity

300 m^3/s

Surface Settling Basin:

Type

Continuous flushing

Number of bays

2

Transition length

52.5m

Dimension (L X B)

101 m X 16.6 m (each)

Particle Trap efficiency

>90%

Settling Zone slope

1 V: 100 H

Sediment Flushing Culvert:

Type

Rectangular, RCC

Number of Chambers

2

Width (each)

1.5 m

Height

1.5 m

Length

23.92 m and 10.64 m

Headrace Tunnel:

Length

2448m

Geometry

Inverted D shape

Dimensions

Excavation Diameter= 5.1 m,

Surge Tank dimensions:

Type

Simple Vertical open to sky

Geometry

Circular

Height

65 m

Maximum upsurge level

1521.38 m amsl

Maximum down surge level

1474.04 m amsl

Internal Diameter

10 m

Excavation Diameter

10.8 m

Penstock Shaft:

Type

Surface

Length

230 m up to manifold

Internal Diameter

4.0 m (Shaft)

Penstock Thickness

14 mm to 28 mm

Power Facilities:

Powerhouse Type

Semi-surface

Dimensions (L X B)

45 m x 16 m

Gross Head

98 m

Net Head

91.6 m

Installed capacity

37.5 MW (3×12.5 MW)

Dry energy

75.57 GWh

Wet energy

155.4 GWh

Annual Net Energy Output

230.97 GWh

Tailrace Culvert:

Type

RCC, rectangular culvert

Length

70 m

Height

3.9 m

Width

4.7 m

Longitudinal slope

1:500 (V:H)

Tail pool normal water level

1398 m amsl

Turbine:

Type

Vertical Axis Francis Turbine

Number of units

3 (Three)

Turbine Axis Level

1396 m amsl

Rated Per Unit Capacity

12.9 MW

Turbine Efficiency

91%

Generator:

Type

Three phase, Synchronous

Number of units

3 (Three)

Rated output

14.72 MVA

Generation Voltage

11kV

Frequency

50Hz

Power factor

0.85

Excitation system

Brushless

Speed

500 rpm

Generation efficiency

97%

Transformer:

Type

Three- phase, oil immersed

Numbers

3 (Three)

Rated output

16.5 MVA

Frequency

50Hz

Voltage ratio

11kV/132 kV

Transformer efficiency

99%

Transmission Facilities:

Transmission line length

29km

Voltage level

132 kV, Single circuit

Financial Indicator:

B/C Ratio

1.20

IRR on total investment

12.87%

IRR on equity investment

16.01%

Net Present Value of total investment

MNPR 1,829.89

Net Present Value of equity investment

MNPR 1,784.96

Total Project Cost

MNPR 8,094.64

Project Cost per MW

MNPR 215.86

Required Commercial Operation Date

10th Shrawan 2080 (26th July 2023).

Construction Period

4 years