.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
Hathiadah-Durgawati fall site is located on left side and Durgawati River on right side in the Kaimur district of Bihar. The site is located about 92 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 Hathiadah-Durgawati 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 |
|
|
River |
Hathiadah River on left side & Durgawati River on right side |
|
|
Project Area |
|
|
|
Longitude |
E 830 44’ 24” |
|
|
Latitude |
N 240 40’ 41” |
|
|
Access to the project |
Bhabua Town 77 km |
|
|
Nearest Village |
Londa |
|
|
Airport |
Patna (270 km)/ Varanasi (160 km) |
|
|
Nearest Railhead |
Bhabua road 92 km |
|
|
Port |
Kolkata |
|
2.0 |
Scheme |
|
|
|
Type |
Pumped Storage |
|
|
Installed Capacity |
1600 MW |
|
3.0 |
Hydrology |
|
|
|
Catchment area |
|
|
|
Upper Dam Hathiadah |
52.95 sq. km |
|
|
Upper Dam Durgawati |
55.33 sq. km. |
|
|
Maximum annual rainfall |
1300 mm |
|
|
Minimum annual rainfall |
540 mm |
|
|
Max Intensity (one day) at Bhagwanpur |
131 mm / day (on 05.09.95) |
|
|
Maximum Design Flood |
|
|
|
Upper Dam Hathiadah |
225 Cumec |
|
|
Upper Dam Durgawati |
232 Cumec |
|
|
Lower Dam |
590 Cumec |
|
|
Annual average sediment load |
0.07 Ha M / Sq km / year (At Kadhwan) |
|
|
Annual Average evaporation |
145 cm (Average of Kadhwan Purulia and Koel Karo) |
|
4.0 |
Civil Structure |
|
|
4.1 |
Dam |
|
|
|
Upper Dam left (on Hathiadah River) |
|
|
|
Type |
Rockfill with central clay ore |
|
|
River bed level |
EL 404 M |
|
|
Top level of Dam |
EL 445 M |
|
|
Maximum height(Above riverbed level) |
41 m |
|
|
Top width of Dam |
8 m |
|
|
Length of the Dam at top |
805 m |
|
|
Reservoir |
|
|
|
MDDL |
El 430 M |
|
|
FRL |
EL 440 M |
|
|
Gross capacity |
25.87 M cum |
|
|
Live storage |
13.05 M cum |
|
|
Reservoir surface area at FRL |
187.5 ha. |
|
|
Upper Dam Right (on Durgawati River) |
|
|
|
Type |
RCC Dam |
|
|
River bed level |
EL 403 M |
|
|
Top level of Dam |
EL 445 m |
|
|
Maximum height (Above riverbed level) |
42 m |
|
|
Top width of Dam |
8 m |
|
|
Length of the Dam at top |
670 m |
|
|
Reservoir |
|
|
|
MDDL |
EL 420 M |
|
|
FRL |
EL 440 M |
|
|
Gross Capacity |
12.62 M Cum. |
|
|
Live storage |
11.59 M cum. |
|
|
Reservoir surface area at FRL |
112.5 ha. |
|
|
Spillway |
|
|
|
Type |
Under sluice |
|
|
No.of bays |
2 |
|
|
Size of bays |
3 m x 4 m |
|
|
Crest Level |
EL 405 M |
|
|
Design flood |
45 cumec |
|
|
Type of gate |
Radial gate |
|
4.2 |
Lower Dam |
|
|
|
Type |
RCC Dam |
|
|
Rive bed level |
EL 186 M |
|
|
Top level of Sam |
EL 257 M |
|
|
Maximum height |
71 m |
|
|
Top width of Dam |
8 m |
|
|
Length of the dam at the top |
275 m |
|
|
Spillway |
|
|
|
Type |
Under Sluice |
|
|
No. of bays |
2 |
|
|
Size of bays |
3 m x 5 m |
|
|
Crest Level |
EL 190 M |
|
|
Design flood |
590 Cuemc |
|
|
Type of gate |
Radial gate |
|
|
Reservoir |
|
|
|
MDDL |
EL 210 m |
|
|
FRL |
EL 252 m |
|
|
Gross Capacity |
30.28 M cum. |
|
|
Live Storage |
24.77 M cum. |
|
|
Reservoir Surface Area at FRL |
78 ha. |
|
4.3 |
Link Tunnel |
|
|
|
Length |
400 m |
|
|
Diameter |
7 m |
|
|
Invert Level |
EL 410 M |
|
|
Outlet |
EL 405 M |
|
4.4 |
Intake |
|
|
|
Type |
Dam body |
|
|
Number |
8 (4 left bank & 4 on right bank) |
|
|
Discharge (With 10% overload load) |
158 Cumec |
|
|
Gate |
Vertical Lift with stop logs. |
|
4.5 |
Pressure Shaft and Penstock |
|
|
|
Pressure Shaft |
|
|
|
Type |
Concrete lined |
|
|
Number |
8 (4 on left bank & 4 right bank) |
|
|
Diameter |
5.5 m |
|
|
Length |
211 m |
|
|
Type |
Steel lined |
|
|
Number |
8 (4 on left bank & 4 right bank) |
|
|
Length (Upper Horizontal) |
80 m |
|
|
Penstock |
|
|
|
Type |
Steel lined |
|
|
Number |
8 |
|
|
Diameter |
5.5 m |
|
|
Length |
75 m |
|
4.6 |
Power House Complex (right bank of Hathiadah) |
|
|
|
Type |
Under Ground |
|
|
Size of Power House Cavern |
135 x 21 x 42.5 m |
|
|
Service bay level |
EL 210 M |
|
|
C.L. of Machines |
EL 200 M |
|
|
Installed capacity |
4 x 200 MW |
|
|
Peak operating duration |
6 hours |
|
|
Length of Main Access Tunnel |
2.5 km. |
|
|
Transformer Cavern cum gate shaft |
|
|
|
Type |
Under Ground |
|
|
Size |
130 x 14 x 31 m |
|
|
Service bay Level |
EL 257 M |
|
|
Tailrace Tunnel |
|
|
|
Type |
D-Shaped (4 Nos.) |
|
|
Diameter |
7 m |
|
|
Tunnel length |
147 m |
|
|
Switchyard |
|
|
|
Type |
Surface |
|
|
Dimension |
220 x 120 m |
|
|
Elevation |
EL + 420 M |
|
4.7 |
Power House Complex (right bank of Durgawati) |
|
|
|
Type |
Under Ground |
|
|
Size of Power House Cavern |
135 x 21 x 42.5 m |
|
|
Service bay level |
EL 210 M |
|
|
C.L. of Machines |
EL 200 M |
|
|
Installed capacity |
4 x 200 MW |
|
|
Peak operating duration |
6 hours |
|
|
Length of Main Access Tunnel |
3.0 km. |
|
|
Net Head |
175.8 m |
|
|
Design Discharge per machine |
142 Cumec |
|
|
Transformer Cavern cum gate shaft |
|
|
|
Type |
Under Ground |
|
|
Size |
130 x 14 x 31 m |
|
|
Service Bay Level |
EL 252 M |
|
|
Tailrace Tunnel |
|
|
|
Type |
D-Shaped (4 Nos.) |
|
|
Diameter |
7 m |
|
|
Tunnel length |
320 m |
|
|
Switchyard |
|
|
|
Type |
Surface |
|
|
Dimension |
220 x 120 m |
|
|
Elevation |
EL + 420 M |
|
5.0 |
Estimated Cost |
|
|
|
Total Project cost (Excluding transmission line) |
Rs. 5140.086 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 8.5 hours pumping |
|
|
|
i) Energy Generation |
3494.40 MU |
|
|
ii) Pumping Energy |
5054.40 MU |
|
|
iii) Sale rate at bus bar |
Rs. 4.71 without free power |
|
|
iv) Sale rate at bus bar |
Rs. 5.35 with 12% free power |
|
(b) |
4.5 hours of peaking and 6 hours of pumping |
|
|
|
i) Energy Generation |
2620.80 MU |
|
ii) Pumping energy |
3785.60 MU |
|
|
|
iii) Sale rate at bus bar |
Rs. 5.67 without free power |
|
|
iv) Sale rate at bus bar |
Rs. 6.44 with 12% free power |
|
(c) |
4 hours of peaking and 5.5 hours of pumping |
|
|
|
i) Energy Generation |
2329.60 MU |
|
|
ii) Pumping energy |
3369.60 MU |
|
|
iii) Sale rate at bus bar |
Rs. 6.15 without free power |
|
|
iv) Sale rate at bus bar |
Rs. 6.99 with 12% free power |
