Diamond Hydropower Pvt. Ltd. (10 MW)
At present, the rate of increase in demand of electricity is far surpassing the rate of increase in production by construction of newer hydropower plants. To cope with the high rate of increase in demand, Government of Nepal has opened up opportunities for private participation in the hydropower development. Therefore, we have completed one 6MW Hydro power project under our group by Kalika Power Company Ltd. in Muchowk VDC, Gorkha which is in well operation now. Further, we have acquired another project downstream of our 6MW's project. We have already completed Feasibility study, Connection Agreement, PPA and got Generation License. Now, the project is in final stage of Detail Engineering Design and work can be started as soon as we received Detail Engineering Design Report. The final report is expected to come within the end of January 2017. This project is a run of the river type project with an installed capacity of 10 MW. The location of the project is 148 Km far from Kathmandu, Nepal and the road is all black topped.
Salient Features:
Location
| Latitude | 28°03’29” N to 28°06’10” N |
| Longitude | 84°38’52” E to 84°40’ 00” E |
| Headworks site | Takumajh Lakuribot and Jaubari VDC |
| Powerhouse site | Takukot, VDC |
| District | Gorkha |
General
| Name of the river | Daraudi |
| Type of scheme | Run-off the River type |
| Gross Head | 88.50 |
| Installed capacity | 10,000kw |
| Annual energy after outage | 51.833GWh |
Hydrology
| Catchment Area upstream of intake | 296 km2 |
| Long-term annual average flow | 22.386 m³/s |
| 40% Exceedance flow (Design Discharge) | 14.96 m³/s |
| Environmental release | 0.098 m³/s |
| 1:100 years return flood | 299 m³/s |
| Annual average precipitation | 1741mm |
Weir
| Type of Weir | Broad crested free flow concrete weir |
| Crest Length | 20m |
| Weir Crest Level | El 578.50 m |
| Maximum Height of Weir | 6.5m |
| High Flood Level | 583.30 |
Cofferdam
| Length of First Phase Cofferdam | 115 m |
| Length of Second Phase Cofferdam | 90 m |
| Height above river bed | 2.5 m |
| Shape of Cofferdam | Trapezoidal with core material |
Undersluice Dam
| Type of structure | Concrete |
| Deck level | El 584.30 m |
| Crest elevation | El 576.0 m |
| Number of bays | 2 |
| Crest length per bay | 2.5 m |
| Gate type | Vertical lift gate |
| Gate and stop log size | 3.0 m x 2.5 m (W x H) |
Intake
| Type | Side Intake |
| Number of bays | 2 |
| Deck Level | 584.30m |
| Gate type | Vertical lift gate |
| Gate size | 1.70 m x 1.5 m (W x H) |
| Stop log size | 1.70 m x 1.5 m (W x H) |
Approach Canal
| Length of Approach canal | 30 |
| Width of canal | Single, 1.3m |
Desander
| Type of desander | Surface, rectangular type |
| Design Discharge of Desander | 3.08 m3/s |
| Depth and width of desander | 4.5 m and 4.0 m |
| Length of Desander | 20 m |
| Flushing Gates | 4 nos. |
headrace Pipe
| Type | Low pressure type, Circular steel pipe |
| Length | 2950 m |
| Diameter of pipe | 2.7m internal |
Headrace Tunnel
| Type of Tunnel | Inverted D-Shaped, pressure flow tunnel |
| Length and Section of tunnel | 2040m |
| Section of tunnel | 3m, inverted D-shaped |
Surge Tank
| Type of Surge Tank | restricted orifice cylindrical tank |
| Dia. of Surge Tank | 7.9m, concrete lined |
| Height of surge tank from top of orifice | 25m |
| Invert level of Surge Tank | 556m |
| Dia. and height of orifice | 1.4m dia. |
| Thickness of orifice | 1m from crown level of pipe |
Penstock Pipe
| Number | 1 |
| Diameter | 2.50 m |
| Length | 724 + 2x24.31 m (bifurcated length) |
| Maximum shell thickness, Steel | 16 mm |
Powerhouse
| Length x width | 30.00 m x 17.0 m |
| Center line of Turbine | El 491.235 m |
| Invert Level of Draft Tube | El 486.735m |
Turbine
| Number of generating units | 2 |
| Turbine type | Francis (horizontal axis) |
| Rated discharge for each unit | 7.48 |
| Turbine rated capacity | 5 x 2 MW |
| Rated net head | 78.49 m |
| Rated turbine efficiency | 92 % |
Generator
| Rating per unit | 5.9 MVA |
| Power Factor | 0.85 |
| Voltage | 6.6 kV |
| Speed | 600 rpm |
| Number of poles | 10 |
| Frequency | 50 Hz |
| Efficiency | 96 % |
Transformer
| Type | Three phase |
| Rating | 5.9 MVA |
| Voltage Ratio | 6.6/33 kV |
| Frequency | 50 Hz |
| Efficiency | 99 % |
Transmission Line(33 kV)
| Type | 33kv, Single Circuit |
| Length of Transmission line | 25km |
| Power evacuation point | Middle Marshayngdi Substation |
Tailrace
| Type | Rectangular, RCC Box |
| Size of Tailrace Channel | 5.8mx2.5m (WxH, internal) |
| Length of Tailrace Canal | 201m |
Access road
| Road to Headworks | 0.5 km (approximately) |
| Road to Powerhouse site | 0.5 km |
Power and Energy
| Installed capacity | 10 MW |
| Dry season energy | 8.588 GWh/year |
| Wet Season energy | 43.244 GWh/year |
| Total energy | 51.832 GWh/year |
Construction Period
| Construction period | 2 years |
Financial Indicators
| Project cost | NRs 1,960,426,580.00 |
| Cost per kW | NRs. 1960 |
| Cost per kW | US$1798 (1US$=NRs109) |
| Dry season Energy Benefit | 8.4NRs/kWh |
| Wet season Energy Benefit | 4.8 NRs/kWh |
| FIRR | 12.82 % at 10% interest rate |
| Equity IRR | 19.53 % |
| Payback period | 7.24 years |
| Benefit-Cost Ratio | 1.35 |
