Upper Mai Hydroelectric Project (UMHEP)
The UMHEP is a run-of-the-river (RoR) type hydropower project located in Maimajhuwa and Mabu of Sandakpur Gaupalika of Ilam district in Mechi Zone with an installed capacity of 12 MW. However PPA was signed with Nepal Electricity Authority for 9.98 MW based on Q40 percentile exceedence. The average annual energy generation of UMHEP (9.98 MW) is 55.924 GWh.
Headworks of Upper Mai HEP Power House of Upper Mai HEP Salient Features Upper Mai Hydroelectric Project (9.98 MW) Hydrology (at intake)
Catchment area of Upper Mai Khola 53.00 km2 Low flow (1 in 2 year) 1.32m3/s Design flow (38 percentile exceedance flow) 3.88 m3/s Long term annual average flow 3.63 m3/s General Hydraulics
Gross head 380.80 m Net head 363.7 m Design flow 3.88 m3/s Installed capacity 12.0 MW Headworks Diversion weir
Type Concrete gravity dam Crest elevation 1628.50 m above msl Crest length 12.00 m Intake
Type Rectangular orifice, Semi-frontal No of orifice Two Size(opening) 3.07 m wide X 1.2 m Under sluice
Invert level 1624.30m above msl Size 2.5m X 1.5m Length 11.50 m
Settling Basin: Type Concrete Number of chambers 2 Size (parallel section) 30.00 m L X 14.0 m W X 6.25 m avg H Normal water level 1628.43 m above msl Maximum water level 1629.04 m above msl Top wall level 1630.80 m above msl
Forebay: Top wall level 1629.04 m above msl Size 15.75 m long X 3.0m width X 1.6m avg. height Crest level of spillway 1627.04 m above msl Maximum water level 1627.97 m above msl (for 100 years flood) Design discharge 3.88m3/s Rate Khola Diversion Tunnel
Tunnel length 154.00 m Size of tunnel 1.80m wide x 1.80 m high Headrace pressure pipe
Total length 628.0 m Internal diameter 1.50 m Headrace tunnel
Shape Inverted D-shape Length 2075.00 m Cross –section 2.00 m wide x 2.50 m high Cross-section area 4.57 m2 Surge shaft
Type Semi under ground Internal diameter 3.50 m Height 30.8 m Penstock Pipe
Type Surface/buried Internal diameter 1.20m Length 1576.00 m Powerhouse and Tailrace
Powerhouse Type Surface Size 27.65 m x 18.0 m x 11.2 m Turbine axis elevation 1247.20 m Tailrace Culvert Buried Culvert size 64.00 m x 2.00 m x 1.50 m Access road
Length 23.2km from Mechi highway Mechanical and electrical
Turbine Type Pelton Rated net head 374.90 m Rated discharge 1.94 m3/s Rated output 6000.0 kW x 2 No. of units 2 Axis level 1247.2 masl Generator Type Brushless Synchronous Capacity 6000.0 kW x2 Voltage 6.6 kV No. of units 2 Transformer Type Three phase Rating 16 MVA Voltage ratio 6.6 kV/132 kV Transmission Line Voltage Level 132 kV Single Circuit Length 18.5 KM Conductor ACSR "WOLF" Energy Generation (9.98 MW)
Dry season energy 9.679 GWh Wet season energy 46.244 GWh Total energy 55.924 GWh Compliance Officer (Anupalana Adhikrit) Omkar Shrestha
Grievance Handling Officer (Gunaso Sunne Adhikari) Ashim Kumar Sharma
Panchakanya Mai Hydropower Limited, a public limited company envision developing Hydropower Projects in Nepal. The Company has successfully commissioned Upper Mai Hydropower Project (12 MW) and Upper Mai “C” Hydropower Project (6.1 MW) in Ilam district with majority share holding of Panchakanya Group, a leading industrial and trading house of Nepal.
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