Panchgotia Pumped Storage Scheme (3 x 75 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.

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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