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Introduction
To cater the power requirement of state, Bihar State Hydroelectric Power Corporation Ltd., (BHPC) is trying to exploit the available hydro potential in the state. In the process of identifying the potential sites for hydro power generation, reconnaissance survey was got conducted by BHPC through NHPC to set up large hydel projects in the district of Kaimur and Munger in Bihar. Reconnaissance survey report was submitted by NHPC to BHPC in May 2002. NHPC in it report identified some hydel projects for possible development. It was also found that from geological and topographical considerations, it was possible to develop Pumped Storage scheme at some locations subject to technical feasibility and economical viability.
Project Purpose
Hathiadah-Durgawati fall site is located on the left fork of Sura river in the Kaimur district of Bihar. The site is located about 50 km from Bhabua road which is the nearest rail head. Sura river is a sub tributary of Durgawati river which is a tributary o Karamnasa river joining Ganga rive Chausa (U.P.). The site is suitable for a Pumped Storage scheme. The power required for pumping the water from lower reservoir to upper reservoir shall be taken from the grid during off-peak hours when it is available at cheaper rates. This will act as value addition to nearby thermal power plant and improve the grid stability. Pumped Storage Schemes consume energy during off-peak hours thereby improving plant load factor of thermal plants. These can act as spinning reserve and help in improvement of load factor of the system. Pumped Storage Schemes can provide the required peaking support especially during lean season. It also helps in smoothening the frequency curve. Pumped Storage Schemes are independent of vagaries of monsoon. During peak period the Telharkund Pumped Storage Scheme shall be able to provide the required high value power to the State of Bihar.
SALIENT FEATURES
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1.0 |
Location |
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Country |
India |
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State |
Bihar |
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District |
Kaimur |
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Nala/River |
Sura river (left fork) |
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Project area |
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Longitude |
N 240 51’ 21” N 240 49’ 44” |
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Latitude |
E 830 31’ 18” E 830 32’ 12” |
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Access to the Project |
Bhabua Town 35 (Km) |
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Airport |
Patna, Varanasi |
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Nearest Railhead |
Bhabua Road (50 km) |
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Port |
Kolkata |
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2.0 |
Scheme |
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Type |
Pumped Storage |
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Installed capacity |
400 MW |
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3.0 |
Hydrology |
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Catchment area |
61.61 Sq. km. |
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Maximum annual rainfall in water watershed |
1300 mm |
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Minimum annual rainfall in watershed |
540.0 mm |
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Max Intensity (one day) |
131.00 mm / day (at Bhagwanpur) (5.9.1995) |
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Maximum observed flow |
21.803 Cumec (at Telharkund fall) (1.9.1996) |
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Minimum observed flow |
0.019 Cumec (At Telharkund fall) |
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Maximum design flood | 250 Cumec |
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Annual average sediment load |
0.07 Ha M / sq km /year (at Kadhwan) |
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Annual Average evaporation |
145 cm (Average of Kadhwan, Purulia and Koel karo) |
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4.0 |
Civil Structure |
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4.1 |
Upper Dam |
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Type |
Roller compacted with central spillway |
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River bed level |
EL 255 M |
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FRL |
EL 315 M |
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Top level of Dam |
EL 320 M |
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Maximum height |
65 m |
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Top width of Dam |
8 m |
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Length of the Dam at top |
500 m |
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Spillway |
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Type |
Trajectory Bucket |
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Length |
14 m |
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No. of bays |
2 |
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Size of bays |
3m x 4m |
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Crest Level |
El. 265 M. |
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Design Flood |
250 Cumec |
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Type of gate |
Radial |
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Care of River |
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Type |
Stage Diversion |
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Design discharge |
100 cumec |
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Reservoir |
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MDDL |
EL 295 M |
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FRL |
EL 315 M |
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Gross capacity |
11.69 Mcum. |
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Live storage |
9.45 Mcum. |
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Reservoir surface area at FRL |
86 ha. |
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4.2 |
Lower Dam |
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Type |
Rock filled with central clay core |
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River bed level |
EL 140 M |
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FRL |
EL 190 M |
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MDDL |
EL 170 M |
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Top level of Dam |
EL 195 M |
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Maximum height from bed level |
55 m |
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Top width of Dam |
8 m |
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Length of the Dam at the top |
310 m |
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Diversion tunnel |
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Length of diversion tunnel |
550 m |
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Diameter |
5 m horse shoe |
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Invert level |
EL 140 M |
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Spillway |
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Type |
Tunnel |
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Length |
70 m |
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Invert level |
EL 145 M |
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Diameter of tunnel |
5 m |
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Design flood |
250 Cumec |
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Reservoir |
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MDDL |
EL 170 M |
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FRL |
EL 190 M |
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Gross Capacity |
15.73 Mcum. |
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Live Storage |
9.36 Mcum. |
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Reservoir surface area |
50 ha. |
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4.3 |
Intake |
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Type |
Dam body |
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Discharge (With 10% overload) |
476 Cumec |
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Gate |
Vertical Lift with stop logs |
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4.4 |
Pressure Shaft and Penstock |
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Type |
Partly Steel and concrete lined |
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Number |
2 |
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Diameter |
7 m |
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Length |
120 m |
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Penstock |
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Upper Horizontal |
48 m |
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Lower Horizontal |
80 m |
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4.5 |
Power House Complex |
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Type |
Under Ground |
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Size of Power House Cavern |
125x40x20 m |
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Service bay level |
EL 170 M |
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Type of Turbine |
Reversible Francis pump turbine |
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No. of Turbines |
4 |
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Design Head |
112.50 m |
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Design Discharge |
432 Cumecs |
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4.6 |
Transformer Cavern cum gate shaft |
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Type |
Under Ground |
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Size |
110X15X23 |
| Service bay level |
EL 192 M |
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4.7 |
Tailrace Tunnel |
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| Type | D-Shaped | |
| No. of Tunnels | 4 | |
| Diameter | 7m | |
| Tunnel Length (Longest) | 115 m | |
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4.8 |
Switchyard |
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Type |
Surface |
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Dimension |
220 x 120 m |
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Elevation |
EL 300 M |
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5.0 |
Estimated Cost |
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Total Project Cost (Excluding transmission line) |
Rs. 1541.99 Crores at Jan Price level |
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Debt: Equity Ratio |
70:30 |
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Levellised Tariff |
Rs. 4.21 per kWH |
| 5.2 | Annual Energy Generation, Off Peak Energy for pumping and tariff | |
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(a) |
6 hours peaking and 8.6 hours pumping | |
| i) Energy generation | 873.60 MU | |
| ii) Pumping energy | 1260.48 MU | |
| iii) Sale rate at bus bar | Rs. 5.33 without free power | |
| iv) Sale rate at bus bar | Rs. 6.06 with 12% free power | |
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(b) |
4.5 hours of peaking and 6 hours of pumping | |
| i) Energy generation | 655.20 MU | |
| ii) Pumping energy | 946.40 MU | |
| iii) Sale rate at bus bar | Rs. 6.44 without free power | |
| iv) Sale rate at bus bar | Rs. 7.32 with 12% free power | |
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(c) |
4 hours of peaking and 5.5 hours of pumping | |
| i) Energy generation |
582.40 MU |
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| ii) Pumping energy | 840.32 MU | |
| iii) Sale rate at bus bar | Rs. 7.09 without free power | |
| iv) Sale rate at bus bar | Rs. 8.06 with 12% free power | |
