Hathiadah-Durgawati Pumped Storage Scheme (8 x 200 MW)

 

 

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