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 |