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Naugarh Gad Small Hydroelectric Project is a run-off-river type project located in the Dethala VDC of Darchula District, Mahakali Zone, Far-Western Development Region. The project utilizes the discharge of Naugarh Gad river which is a major tributary of the Chameliya River. The project is accessible by road from Gokuleshwore on Mahakali Highway. The Project site is around 7 Km from Gokuleshwor. The latitude and longitude of the project area are 29°41′16&Prime to 29°43′30&Prime North and 80°36′15″ to 80°36′46″ East.

 

The installed Capacity of the Project is 8500 KW which is obtained from a head of 134 m and design discharge of 8.5 m3/sec. The headworks of the project is located near the confluence of Naugarh and Suke Khola about 4.5 Km upstream from the powerhouse at Dethala Village. Water is diverted by a 5 m high diversion weir to a 65 m long desander which filters out the sand particles. The water is then diverted to the 4500 m long buried steel penstock of 2.1 m diameter which carries the water to the powerhouse at Dethala Village.

 

The powerhouse consists of two units of 4250 KW Francis turbines connected to two units of 5500 KVA generators which generate the electricity. The power is evacuated 33KV, transmission line (5 KM) which is connected to the Balanch substation of Chameliya Hydroelectric Project.

 

The overall cost of the Project is NRs. 1435 million of which NRs. 408.460 million (30%) is equity investment and NRs. 952 million (70 %) is bank loan. The FIRR of the Project is 17.56% and Benefit Cost Ratio is 1.58 at a discount rate of 11%. The financial markers indicate that the project will earn high returns on the investment.

 

Project Details

Project Name

: Naugarh Gad Hydroelectric Project

Development Region

: Far Western

Zone

: Mahakali

District

: Darchula

Intake Site

: Dhuligada VDC

Powerhouse Site

: Dethala VDC

Geographical Co-ordinates

 

Latitude

: 29°43'30" N to 29°41'15" N

Longitude

: 80°36'46" E to 80°36'15" E

General

 

Water Source

: Naugarh Gad

Nearest Town

: Gokuleshwor

Type of Scheme

: Run-of-river

Gross Head

: 137.0 m

Net Head

: 122.30 m

Installed Capacity

: 8,500 kW

Hydrology

 

Catchment Area

: 194 km2

Average Annual Precipitation

: 2192 mm/year

100 years Design Flood (HW)

: 323 m3/s

100 years Design Flood (PH)

: 753 m3/s

Minimum Monthly Flow

: 3.58 m3/s

Riparian Release Intake

 

Naugarh Gad

: 0.358 m3/s

Headworks

 

Diversion Structure

: Hard Stone Lined Gravity Free Flow Weir

Type of Weir

: Concrete gravity dam

Length of Weir

: 37.05 m

Weir Crest Elevation

: EL 870 msl

Height of Weir

: 3.50 m from U/s Apron

Undersluice

: 2 Vertical Sluice Gates

Crest of Sluice

: EL 866.70 msl

Size of Sluice Gate (b x h)

: 3.0 m x 2.6 m

Intake Type

: Side Intake

Size of Opening

: 2.50 x 1.40 – 4 nos

Crest Elevation of Intake

: EL 868.80 msl

Gravel Trap

 

Type

: Rectangular with Slide Slopes

No. of bays

: 2

Particle Size to be Settled

: 20 mm

Trap Efficiency

: 98 %

Size of Gravel Trap (LxBxH)

: 14.50 m x 7.50  x (2.85 m – 3.95 m)

Spilway Length

: 17.06 m

Bed Slope

: 1:10

Flushing Channel Size

: 2 Nos. of 1.2 m x 1.0 m Rectangular Closed

Desander

 

Type

: Double Dufour Double Chamber Continuos Flushing Type

Trap Efficiency

: 90%

Size of Each Chamber (LxBxH)

: 55.0 m x 7.50 m x (3.65m – 4.65m)

Bed Slope

: 1:50

FSL @ Desander end

: 869.80 msl

Flushing Channel Size

: 2 Nos. of 1.0 m Rectangular

Headrace Pipe

 

Type

: MS-Pipe beried Section

Total Length

: 3740.40 m

Pipe Material

: IS 2062-B

Thickness

: 8 mm to 16 mm

Diameter of Pipe

: 2.10 & 2.0, 10mm – 12mm Thickness

Surge Tank

 

Type

: Circular Cylinder, Concrete (RCC)

Number of Chamber

: 1

Dia of Tank

: 12.0m

Total Height of Tank

: 24.30 m

Invert Level of Tank

: 854.15 m

Static Level

: 870.00 m

Upper Surge Level

: 878.16 m

Down Surge Level

: 855.87 masl

Penstock Pipe

 

Type

: MS-Pipe Open Structure

Length

: 14m from T  to Surgetank and 633.8m from T to Powerhouse

Pipe Materialize

: IS 2062-B

Size of Pipe

:1.7m dia , 10mm thick (from T-ST) & 1.9m dia 12mm-22m (from T-PH)

Number of Anchor Blocks

: 13 Nos. Including T, Y, B and A

Number of Supports

: 80 Nos.

Powerhouse

 

Type

: Surface

PH Dimensions, main Building (l x b)

: 29.80 m x 9.50 m

Height of PH Building

: 9.50 from Plinth Level

PH Floor Level

: EL 732.50 m

Tailrace

 

Type

: Closed Rectangular RCC Canal

Length

: 146.60 m (Including Both Units)

Size (w x h)

: 3.0 m x 2.75 m

Tailrace Water Level

: El 733.0 m at Outlet

Slope

: 1:500

Turbine

 

Type of Turbine

: Francis

Number

: Two (2)

Shaft Arrangement

: Horizontal

Rated Discharge for each Turbine

: 4.15 m3/s

Rated head

: 122.30 m

Rated Output for each Unit

: 4500 kW

RPM

: 1000

Rated Efficiency

: 90 % (at 100% Discharge)

Generator

 

Type

: Synchronous brushless, 3Ø AC

No of Units

: 2

Rated Voltage

: 6.3 kVA

Power Factor

: 0.85

Layout

: Horizontal

Rated Efficiency

: 96%

Rated Output

: 5000 kVA

Rated Frequency

: 50 Hz.

Power Transformer

 

Type

: Step up Power Transformer

Rated Capacity

: 11000 kVA

Rated Efficiency

: 99%

No of Unit

: 1

Number of Phases

: 3 ph, 50 Hz

Types of Connection

: Star/Delta

Type of Cooling

: ONAN

Voltage Ratio

: 6.3 kV (LV Side) / 132 kV (HV Side)

Station Supply Transformer

 

Type

: Indoor and Outdoor Type

Rate Power Output

: 200 kVA

No of Unit

: 2

Type of Cooling

: ONAN

Voltage Ratio

: 6.3/0.4 kV

Connection / Vector Group

: Dyn11

Transmission & Interconnection

 

Power House – Balanch Substation

: 4.8 km

Type of Circuit

: 33 kV Single Circuit Line up to 132 kV Balanch S/S

Line Conductor

: ACSR "DOG" 150mm2

Transmission Voltage

: 33 kV

Proposed Interconnection Point

: Balanch 33/132 kV Substation

Power and Energy

 

Installed Capacity

: 8.50 MW

Total Gross Energy

: 53.64 GWh

Contract Energy after Outage & Loss

: 50.96 GWh

Wet Saleable Energy

: 40.40 GWh (79.27%)

Dry Saleable Energy

: 10.56 GWh (20.73%)

Project Financial Indicators

 

Base Cost of the Project

: 1339 Millions NRs(Without IDC)

Term Loan

: 98 Crores

Interest Rate

: 8.5%

PPA Rate

: 4.00 Wet and 7.00 Dry Season  

Simple Payback Period

: 6.3 years

B/C Ratio

: 1.26

IRR

: 15.38%

EIRR

: 20.65%

Average DCBR

: 1.17

 

 

Contract Energy and Revenue as per PPA
Month Contract Energy (kWhr) Rate Revenue
Baisakh 3112552 4.00 12,450,208
Jestha 4510176 4.00 18,040,704
Asadh 6204211 4.00 24,816,844
Shrawan 6010330 4.00 24,041,320
Bhadra 6010330 4.00 24,041,320
Ashwin 6010330 4.00 24,041,320
Kartik 5816448 4.00 23,265,792
Mangsir 3436707 4.00 13,746,828
Poush 2948176 7.00 20,637,232
Magh 2564546 7.00 17,951,822
Falgun 2666632 7.00 18,666,424
Chaitra 2644500 7.00 18,511,500
  51934938   240,211,314

 

Market Price

Today's Nepal Share Market


Max Price Min Price Closing Price Prev. Closing Diff.
292 285 286 290 -4

 


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