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Super -Dordi

1.1 General Arrangement  
It is a Run-of-River type of project utilizing water of Dordi Khola and collection of Purmu at the Adit site. The discharge of Dordi Khola shall be diverted to the left side of the river towards gravel trap. Course material up to 20mm shall be settled in Gravel Trap.

There will be inlet portal towards underground desander for the settlement of fine sediment of size up to 0.15mm. The headrace tunnel of 4.8km follows to underground surgetank at the end of horizontal portion after Taje Village on the ridge before Lodo Khola.

There are two intermediate adit at Prumu Khola and Kyame Khola. Prumu Khola discharge will be collected in headrace tunnel from the same access tunnel near purmu khola.  After the surge tank, there will be underground inclined penstock shaft which directly delivers flow to surface power house having vertical axis Pelton turbines. The discharge will be release back to Dordi Khola near confluence with Lodo khola from tailrace canal.

There will be generators, control panels, power transformers, 132kV switchyard and single circuit transmission line to proposed Dordi Corridor Hub at Kirtipur which is further connected to Udipur 220/132kV substation for power evacuation to national grid.  The company has signed connection agreement for the evacuation of the power through Udipur substation after 2017.

1.2 Project Execution Parties

 

1.3 Capacity Enhancement

 

1.4 Contract Energy Table

1.3 Salient Features
The following is the brief salient feature of Super Dordi Hydropower Project-Kha.

Project Details
Location of Project Site Dordi Gaupalika, Lamjung, Province-4, Nepal
Type of Scheme Run of River (RoR)
Installed Capacity 54.0 MW + 10% Continuous Overload (CoL) i.e. 59.4 MW
Gross head 638.3 meter
Rated Design head 584.36 m
Design Plant Discharge 9.9 m3/sec
Hydrology
Catchment Area Dordi 142.50 sq km
Catchment Area Purmu 9.10 sq km
Average annual precipitation 2035 mm/year
100 years Design Flood (HW) 300 m3/sec
Design Discharge Dordi Intake 9.30 m3/sec (Q40%)
Design Discharge Prumu Intake 0.60 m3/sec (Q40%
Headworks
Diversion structure Broad Crest Free flow- Gravity
Height 7.5 m
Length of weir 18.5 m
Weir crest elevation EL 1847.0msl
Undersluice 1 Vertical Sluice gate
Side Intake 3.5x1.2 - 3 nos
Gravel Trap
Type Rectangular
Particle Size to be settled 20mm
Size of Gravel Trap 3.0mx1.75-5.5 m; 40 m length
Bed Slope 1:10(Main Part)
Desander
Type Dufour Double Chamber
Particle Size to be settled 2 Chambersx82x10.0mX7.57m-9.81m;
Size of Desander 1:50
Bed Slope 191.0m
Headrace Tunnel
Tunnel Length 5,158 m
Size of Tunnel D shaped- Low Pressure,2.8 m diameter
Flushing Tunnel at Desander 2.0mx2.0 Inverted "D" shaped
Access Tunnel to Desander 2.6mx 2.6m "D" Type x 90m
Adit Tunnel at Purmu 2.6mX2.6m (189m)
Adit Tunnel at Kyame 2.6mX2.6m (390m)
Rock Trap 2.6mX2m; 20 m length
Surge Shaft and Adit to Shaft
Type Cylindrical Restricted Orifice
Diameter of Tank 6.0 m
Dia of Orifice 2.0m
Total Height 49.2 m
Adits for Surge Shaft 58.0m length
Size of Adits 2.6mX2.6m inverted "D" Type
Penstock Shaft
Type Steel Lined (Drop & Hor.)
Length 1185.0m (Including All Branches)
Pipe Material High Strength steel
Size of Pipe 2.0m dia, 10-50mm
Number of Adits for Shaft 1 nos
Penstock Access Adit 1x Inverted “D” (2.6mX2.6m) 186m
Power house
Type Surface with bedrock cutting
PH dimension (l x b) 45 x 15 m
Height of PH building 10.2 from Floor Level
Tailrace Tunnel
Type Rectangular RCC
Size (wxh) (2.0 to 4.0m) x2m
Length 462m (Including all Units)
Diameter 3.5m, inverted D shaped
Turbine
Type of Turbine 3 units of Pelton in vertical arrangement
Rated discharge for each turbine 3.3 m3/s
Rated Output for each unit 17500 kW
Rated Efficiency 91 %( at 100% discharge)
Generators
Generator 3 nos x AC Synchronous
Excitation Brushless excitation
Rated Voltage 11.0 kV
Power Factor 0.85
Layout Vertical
Rated Efficiency 96 %
Rated Output 19500 kVA
Power Transformer
Type Step up power transformer
Rated Efficiency 99 %
Rated Capacity 20500 kVA
No of Unit Single phase x 3 units and 1 spear unit extra
Type of Cooling ONAN(oil natural air natural)
Voltage Ratio 11 /132 kV
Station Supply Transformer
Type Indoor type
Rate Power output 200 kVA
No of Unit 2
Type of Cooling ONAN
Voltage Ratio 11.0/0.4 kV
Transmission & Interconnection
Power House – Proposed Kirtipur S/S 132 kV x 5.8 km
Type of Circuit Double circuit
Line Conductor ACSR WOLF 150 mm2
Proposed Interconnection Point Dordi 132kV Hub Substation at Kirtipur
Number of towers 21
Power and Energy
Installed Capacity 54 MW
Total Gross Energy 314.98 GWh
Deemed Generation (Contract Energy) 289.464 GWh
Wet Saleable Energy 244.105 GWh (84%)
Dry Saleable Energy 45.360 GWh (16%)
Construction Period 3 years
Financial Indicators
Base Cost of the Project (without IDC) NRs 7373.476 millions(US$ 71.587 millions)
Cost per kW with IDC US$ 1623 (1 US $ = NRs. 103)
Loan/Equity Ratio 80:20
Loan Interest Rate 12%
PPA Rate Considered 6.20 per unit
IRR 16.9%
B/C Ratio 1.46
RoE 29.2%

FEATURED POSTS

NOTICE TO STAKEHOLDERS

Transmission Line Invitation to Tenderer Aug 04, 2019

Road Construction