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Ingwa Hydropower Limited

Ingwa Hydropower Limited, a company established and incorporated for the development and operation of hydro and solar projects to generate and supply electricity to National grid as its prime objective. The company has successfully constructed and operating its 9.7 MegaWatt, Mathilo Ingwa Khola Hydroelectric Project a run off river type project in Ingwa river, a tributary of Kabeli river located at Yangbarak Municipality, Panchthar district of Province 1 in the eastern region of Nepal. The major promoter/investor behind this company is Api Power Company Limited, a leading company in Nepal's Power Sector with Power Generation and Supply to National Grid as its core business. Api Power Company Limited has invested NPR 15.00 crores and has owned the 25% stake holding in the Company.  As a Promoter in this Ingwa Hydropower Limited Api Power Company Limited invest Equity required for the development of the Projects owned.

Geographically the Project is located between the Latitude 270 16' 46" to 270 17' 20” North and longitude: 870 52' 22" to 870 55' 20" East. The intake and powerhouse sites lie in the Panchthar District at altitudes of 1106.5m amsl and 911 m amsl respectively. The effective catchment area of Ingwa River at the proposed intake site is around 202 km2. Based on the hydrological analysis, a design discharge of 6.21 m3/s is derived at 45.97% probability of flow exceedance.

 A free flow ogee shaped diversion weir of 5m height from river bed and 45m long weir is designed for intake at EL 1106.5m amsl. The diversion weir and its appurtenances are designed considering a one in 100-year high flood event whose magnitude is estimated to be 1129 m3/s. Powerhouse of the project is located at EL 911m amsl near Ambot, Yangwarak R. Municipality, Panchthar.

With the available gross head of 195.5m and considering the losses in water conveyance, a net head of 182.15m is available at Powerhouse. Two units of horizontal axis Francis turbines 5.057 MW (each) is designed to generate 9.7 MW power at design discharge of 6.21 m3/s and 182.15m head. 16 km long 33 kV double circuit transmission line is being erected to evacuate the power from the switchyard to NEA’s substation at Kabeli Substation, Pachthar district. The total annual energy generation from the plant will be 61.84GWh. However, the annual energy available for sale excluding all possible outages at 4% would be 59.37 GWh, out of which 50.46 GWh is the wet seasonal energy and 8.91 GWh is the dry seasonal energy.

The company has obtained survey license of the Project from the Department of Electricity Development, Ministry of Energy and completed the Detailed Survey of the Project. Company has entered into the Power Purchase Agreement with Nepal Electricity Authority on dated 18th Ashwin, 2078 B.S. The IEE has already been approved by the Ministry of Energy and the Land acquisition for the Project has been completed. Company has obtained the Generation Licence from Ministry of Energy, Department of Electricity Development (DOED) on dated 28th Kartik, 2077 B.S.

The Project has started its Commercial Operation from 28th Chaitra, 2080 B.S. (10th April, 2024). 

Name of Project                                           :           Mathilo Ingwa Hydro Power Project

Name of River                                              :           Ingwa Khola

Project Location

District                                                           :           Panchthar

Geographical coordinate                          :           Latitude 27°16’46” N to 27°17’20” N , Longitude 87°52’22” E to 87°55’20” E

Intake                                                             :           Khudibari, Yangwarak R. Muncipality, Pancthar

Powerhouse                                                 :           Ambot, Yangwarak R. Municipality, Panchthar

Hydrology

Catchment Area at Dam Site                   :           202 km²

Mean Annual Precipitation                     :           2236 mm

Mean Annual Flow                                    :           13.21 m³/s

Design Flood (1 in 100 yr.)                     :           1129 m³/s

Power Generation

Type of Project                                           :           Run-of-river

Turbine Discharge                                    :           6.21 m³/s

Total Gross Head                                       :           195.50 m

Net Head                                                      :           182.15 m

Installed Capacity                                     :           9.7 MW

Average Annual Energy                          :           59.37 GWh

Dry Energy                                                 :           8.91 GWh

Wet Energy                                                 :           50.46 GWh

Diversion Weir

Type of weir                                               :           Free flow ogee shape

Length of weir                                           :           45.00m

Height of weir                                            :           5.00m

Invert level                                                 :           1101.50m

Weir crest level                                         :           1106.50m

Under sluice

Nos. of bay                                                 :           2

Width                                                          :           2.00m

Height                                                         :           3.50

Design discharge                                   :           15% of flood discharge

Invert level                                           :           1101.00m

Top level of structure                            :           1112.06m

Intake

Type                                                     :           Side intake

Nos. of orifice                                       :           3

Width                                                   :           1.70m

Height                                                  :           2.40m

Invert level                                           :           1104.00m

Spillway

Width                                                   :           12.50m

Depth                                                   :           1.85m

Invert level                                           :           1106.50m

Approach canal & connecting canal

Approach canal type                              :           Free flow, Rectangular RCC

Nos.                                                     :           1

Width                                                   :           1.75m

Height                                                  :           2.65m

Length                                                  :           19.3m

Slope of bed                                          :           1V:500H

Invert level at start                                :           1104.10m

Invert level at end                                 :           1104.07m

Settling basin

Nos. of bay                                           :           2 bay with hopper type, Intermittent flushing

Particle to be settled                              :           >=0.2mm

Inlet transition Length                           :           12.00m

Width of each bay                                 :           6.50m

Overall depth                                        :           5.83m

Settling Length                                     :           56.00m

Invert level at start of transition              :           1104.18m

Invert level at end of transition               :           1100.34m

Bed slope                                             :           1V:50H

Bed width                                             :           0.80m

Bed height                                            :           Varying

Invert level at end of settling basin         :           1099.14m

Head pond

Width                                                   :           10.75m

Depth                                                   :           3.50m

Length                                                  :           13.20m

Total depth                                           :           8.30

Water level                                           :           1106.18m

Invert level                                           :           1098.38m

Surge pipe

I.D                                                       :           1.80m

Thickness of pipe                                  :           10mm to 20mm

Length                                                  :           312.10 m

Surge tank

Upsurge level                                        :           1108.00

Down surge level                                  :           1057.81

Size

Length                                                  :           15.00m

Width                                                   :           6.00m

Penstock pipe

I.D                                                       :           1.70m

Length                                                  :           157.58 m

Thickness of pipe                                  :           18mm to 20mm

Bifurcation pipe

I.D                                                       :           1.20

Total Length                                         :           32.00

Thickness of pipe                                  :           14mm

Powerhouse

Type                                                     :           Semi Surface

Type of turbine                                     :           Francis turbine with horizontal axis

No. of units                                           :           2

Size (L*B*H)                                       :           30.0m*16.5m*13.5m

Tailrace

Type Closed                                         :           RCC canal

Width                                                   :           2.00

Height                                                  :           2.20

Length                                                  :           53.0 m

Financial

IRR on investment                                :           14.55%

IRR on Equity                                       :           18.51%

B/C                                                      :           1.350

NPV                                                     :           650.071Million

DSCR                                                  :           1.5390

Project Cost                                          :           NRs.1,988,265,589