.jpg)
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
Panchgotia fall site is located on the Karsotha Nallah in the Kaimur district of Bihar. The site is located about 60 km from Bhabua road which is the nearest rail head. 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 Panchgotia Pumped Storage Scheme shall be able to provide the required high value power to the State of Bihar.
SALIENT FEATURES
|
1.0 |
Location |
|
|
|
Country |
India |
|
|
State |
Bihar |
|
|
District |
Kaimur |
|
|
Nala/River |
Karsotha Nallah |
|
|
Project Area |
|
|
|
Longitude |
E 830 -37’ 54” |
|
|
Latitude |
N 240 46’ 36” |
|
|
Access to the Project |
Bhabua Town 45 km |
| Nearest Village |
Chorpania |
|
|
|
Airport |
Patna(240 km)/ Varanasi(130 Km) |
| Nearest Rail head |
Bhabua road 60 km |
|
|
|
Port |
Kolkata |
|
2.0 |
Scheme |
Pumped Storage |
|
|
Type |
Pumped Storage |
|
|
Installed Capacity |
225 MW
|
|
3.0 |
Hydrology |
|
|
|
Catchment area |
28.2 sq. km. |
|
|
Maximum annual rainfall |
1300 mm |
|
|
Minimum annual rainfall |
540 mm |
|
|
Design flood |
140 Cumec |
| Annual average sediment load | 0.07 Ha M/ Sq km/ year (at Kadhwan) | |
| Annual Average evaporation | 145 cm (average of Kadhwan Purulia andKoel Karo | |
|
|
Max Intensity (one day) At Bhagwanpur |
131 mm/day (on 05.09.95) |
|
|
Minimum observed flow at Panchgotia fall |
0.00 Cumec |
|
|
||
|
|
Annual average sediment |
0.07 Ha M / Sq km / year (at Kadhwan) |
|
|
Annual Average evaporation |
|
|
4.0 |
Civil Structure |
|
|
4.1 |
Upper Dam |
|
|
|
Type |
Composite Dam –Rockfill with central clay core and Rolled Compacted Concrete Dam |
|
|
River bed level |
EL 324 M |
|
|
Top level of Dam |
EL 360 M |
|
|
Maximum height (Above riverbed level) |
36 m |
|
|
Top width of Dam |
8 m |
|
|
Length of the Dam at top |
950 m |
|
|
Spillway |
|
|
|
Type |
Sluice spillway with Trajectory Bucket as energy dissipater |
|
|
No. of bays |
2 |
|
|
Size of bays |
2 m x 4 m |
|
|
Crest Level |
EL 328 M. |
|
|
Design flood |
140 cumec |
|
|
Type of gate |
Radial gate |
|
|
Reservoir |
|
|
|
MDDL |
EL 345 M |
|
|
FRL |
EL 356 M |
|
|
Gross capacity |
12.08 Mcum. |
|
|
Live storage |
6.04 Mcum. |
|
|
Reservoir surface area at FRL |
124 ha. |
|
4.2 |
Lower Dam |
|
|
|
Type |
Roller Compacted Concrete Dam |
|
|
River bed level |
EL 188 M |
|
|
FRL |
EL 240 M |
|
|
MDDL |
EL 210 M |
|
|
Top level of Dam |
EL 245 M |
|
|
Maximum height |
57 m |
|
|
Top width of Dam |
8 m |
|
|
Length of the Dam at the top |
380 m |
|
|
Spillway |
|
|
|
Type |
Sluice spillway with Trajectory Bucket as energy dissipater |
|
|
No. of bays |
2 |
|
|
Size of bays |
2m x 4 m |
|
|
Crest Level |
EL 195 M |
|
|
Design flood |
140 Cumec |
|
|
Reservoir |
|
|
|
MDDL |
EL 210 M |
|
|
FRL |
EL 240 M |
|
|
Gross Capacity |
7.19 Mcum. |
|
|
Live Storage |
5.54 Mcum. |
|
|
Reservoir surface area at FRL |
37.5 ha. |
|
4.3 |
Intake |
|
|
|
Type |
Dam body |
|
|
Discharge (With 10% overload) |
282 Cumec |
|
|
No. of opening |
3 |
|
|
Intake gate hoists |
Vertical Lift type with rope drum hoists |
|
4.4 |
Penstock |
|
|
|
Type |
Steel lined |
|
|
Number |
3 |
|
|
Diameter |
6 m |
|
|
Length |
106.5 m |
|
|
Pressure Shaft |
|
|
|
Type |
Circular partly Concrete and partly Steel lined |
|
|
Number |
3 |
|
|
Concrete Portion |
|
|
|
Length |
138 m |
|
|
Diameter |
6m |
|
|
Steel Portion |
|
|
|
Length |
49.5 m |
|
|
Diameter |
4.5 m |
|
4.5 |
Power House Complex |
|
|
|
Type |
Under Ground |
|
|
Size of Power House cavern |
100x18x37 m |
|
|
Service bay level |
EL 210 M |
|
|
C.L. of machines |
EL 200 M |
|
|
Installed capacity |
3 x 75 MW |
|
4.6 |
Tailrace Tunnel |
|
|
|
Type |
D-shaped (3 nos.) |
|
|
Diameter |
6 m |
|
|
Tunnel length |
185 m |
|
4.7 |
Switchyard |
|
|
|
Type |
Surface |
|
|
Dimension |
160 x 80 m |
|
|
Elevation |
EL 340 M |
|
5.0 |
Estimated cost |
|
|
|
Total Project cost (Excluding transmission line) |
Rs. 1057.76 crores at Jan 2006 price level |
|
|
Debt: Equity Ratio | 70:30 |
|
5.1 |
Annual Energy Generation, off-peak energy for pumping and tariff | |
|
(a) |
6 hours peaking and 8.6 hours pumping | |
| i) Energy Generation |
491.40 MU |
|
| ii) Pumping energy |
705.51 MU |
|
| iii) Sale rate at bus bar | Rs. 6.04 without free power | |
| iv) Sale rate at bus bar | Rs. 6.86 with 12% free power | |
|
(b) |
4.5 hours of peaking and 6 hours of pumping | |
| i) Energy generation | 368.55 MU | |
| ii) Pumping energy | 532.35 MU | |
| iii) Sale rate at bus bar | Rs. 7.46 without free power | |
| iv) Sale rate at bus bar | Rs. 8.48 with 12% free power | |
|
(c) |
4 hours of peaking and 5.5 hours of pumping | |
| i) Energy generation | 327.60 MU | |
| ii) Pumping energy | 472.68 Mu | |
| iii) Sale rate at bus bar | Rs. 8.16 without free power | |
| iv) Sale rate at bus bar | Rs. 9.28 with 12% free power | |
