Govt of UP has entrusted implementation of 24 MW Dhukwan Small Hydro Project to THDCIL. Project is located near village Sukhwan-Dhukwan in Tehsil Babina, in Jhansi district of Uttar Pradesh on river Betwa. Implementation agreement was signed between GOUP and THDCIL on 2nd Sep’09.

Project is about 37 Km from Jhansi on Jhansi-Lalitpur road. The nearest rail head is Jhansi. The project site falls in the survey of India toposheet No. 54 K/12/NW and is connected with all weather metalled road. The geographical co-ordinates of the project site are latitude 250 12′ E and longitude 780 33′ N.

The project is of 24 MW capacity, utilizing the storage of existing reservoir of Dhukwan masonry cum Earthen Dam.  The length of the Dam is 2972 m. The gross capacity of the existing reservoir is 5780 MCum with top F.S.L. 273.7 m.

THDCIL has constructed 1433m long head race channel, 4nos of RCC Intake barrels, Forebay, Penstock three numbers of 4.0 m dia each, Surface Power house with three units of 8 MW capacity vertical Kaplan turbine and a 961m long Tail race Channel. Annual Energy Generation shall be 97.82 MU at 46.53% load factor (as per availability of water).

The project does not involve any R&R works. Gazette Notification for 39 Ha. Forest land was issued on Jun-2014.

THDCIL Board has been approved RCE amounting to  Rs. 294.60 Cr including IDC of  Rs. 19.04 Cr at Jul-16 PL.

Commissioning:

  1. Unit-1-  Synchronized on 29.09.19
  2. Unit-2-  Synchronized on 02.12.19
  3. Unit-3-  Synchronized on 19.12.19

Dhukwan Project that was awaiting clearance for commercial operation since its commissioning on 20.12.19 has finally been allowed to start generation and inject power to the grid by UPSLDC and UPPCL. After availability of water, Project has started commercial operation since evening of 05.05.2020 and running successfully as per water head available. PPA signed with UPPCL of Dhukwan Project has also been approved by Hon'ble UPERC during Online hearing held on 13.05.20. Capacity addition of 24 MW w.e.f. 13.01.2020 at 00:00 Hrs. has also been accepted by UPSLDC vide letter dtd. 13.05.2020

GENERAL

Location
State Uttar Pradesh
District Jhansi
Tehsil Babina
Village Sukwan Dhukwan
River Betwa
Access 30km from Jhansi through Road
Nearest rail head (B.G.) Jhansi
Geographical co-ordinates
Latitude 25°12’E
Longitude 78°33’N
Reference Toposheet No. 54 K/ 12/ NW
DAM (Existing)
(Existing Dhukwan Dam is 2972 m long Masonary cum Earth & Rockfill Dam across river Betwa.)
Catchment Area 21, 34, 160 Ha
Gross Capacity 5780 MCM
Spillway Crest Level 271.27 m
F.S.L. 273.70 m
H.F.L. 275.55 m
Top Level 277.00 m
Length of Masonry Dam 1172 m
Length of Earthen Dam 1800 m
Submergence Area 1943 Ha.
Maximum Height of Dam 8.22 m
No. & Size of Spillway Gates 383 no. (10 ft wide & 8ft high)
Design Discharge of Spillway 15, 260 cumecs
Hydrology
Catchment Area at Dam Site 8240 sq. miles (21, 24, 160 Ha)
Type of Catchment Rugged and hilly
Rainfall Dam is existing across river betwa and releases from reservoir are proposed to be passed through the Power House. The discharges of the river at dam site and releases from dam are available for the years 1990 to 2009.
Maximum Flood Discharge 20,000 cumec (6.42 lacs cusecs observed in the year 1983). This is the maximum observed since 1961.
Reservoir Capacity 2.04 T.M.C.
Reservoir
F.R.L. E L 273.70 m
MDDL E L 268.30 m
Minimum Tail Water Level E L 251.70 m
HFL in D/S of TRC EL 258.50 m

PROJECT FEATURES

Supply/ Appproach Channel
Shape Trapezoidal
Bed width 24.00 m
Bed Slope Horizontal
Bed level 264.50 m
Length 540 m in existing reservoir
Side Slope 1.5 H: 1.0 V
Reinforced Cement Concrete Barrels
Shape Rectangular
Size 4.5 m (w) x 5.5 m (H)
Bed Level 265.50 m
Length 42 m
No. of Barrels 4
Head Race Channel
Design Discharge 160 cumec
Shape Trapezoidal
Bed Width 6.00 m
Bed Slope 1 in 4000
Bed Level D/S of Barrels 265.50 m
Length 1750 m
Berm Level (1.0 m wide) 270.00 m
Side Slope 1.0 H: 1.0 V upto Berm Level
1.5 H 1.0 V above Berm Level
Free Board 1.50 m
Top Level 275.0 m
Depth of Flow 8.00 m At intake
FSL 273.50
Lining Thickness 100 mm (C.C. M-15)
Forebay
FSL in Forebay EL 273.00 m
MDDL in Forebay EL 267.70 m
Design Discharge 160.00 cumec
Free Board 1.50 m
Material Stone Masonary/ Cement Concrete
Storage Capacity 19200 cum
Length of Forebay 95.00 m
Width of Forebay 39.60 m
Height 16.00 m
Top Level of Forebay EL 274.50 m
Bed Level near Penstock EL 258.50 m
Penstock
Shape Circular
Size (Dia.) 4000 mm
Nos. 3
Length 100.00 m
Thickness 12 mm
Material Mild steel
Design Discharge 53.33 cumecs for each Penstock
Intake Level at Forebay 258.50 m
Power House
No. of Machines 3
Type of Machines Kaplan
Power House Surface Power House
Head
Gross (weighted) 20.60 m
Design 17.85 m
Size of Power House
Length 64.0 m
Width 24.0 m
Deepest Foundation Level 240.40 m
Top Level of Power House 277.00 m
Level of Centre line of M/c 249.70 m
Erection Bay Floor Level 261.5 m
Installed Capacity 3 x 8 MW
Spillway at Forebay
Crest Level of Spillway 269.80 m
Design Discharge 176 cumec
Nos. of Gate 2
Pier Thickness 2.0 m
Size of Gate 9.5 m (W) X 3.2 m (H)
Spill Channel
Shape Trapezoidal
Length 280
Width 21 m
Design Discharge 176 cumec
Side Slope (H: V) 1:1
Bed level at D/S end 258.00
Bed Slope 1:320
Water Depth 1.80 m
Tail Race Channel
Length 650.0 m
Shape Trapezoidal
Discharge 160.00 cumecs
Bed Slope (S) 1/1000
Side Slope (H: V) 1:1
Bed Width 30 m
Bed level at D/S end 251.00 m
Water Depth 2.1 m
Cross Drainage Works
At Kappa Nala
Nos. of Barrels 4 Nos.
Width of Barrels 3.5 m
Height of Barrels 3.0 m
Length of Barrels 80 m each
Bed Level of Barrels ± 258.50 m
Cross Drainage Works
At Nala-1, 2 & 3
Nos. of Barrels 01
Size 3.5 m (W) X 3.0 m (H)
Cross Drainage Works
At Nala-4
Nos. of Barrels 02
Size 3.5 m (W) X 3.0 m (H) each
Cross Drainage Works
At Nala-1, 2 & 3
Nos. of Barrels 01
Size 3.5 m (W) X 3.0 m (H)
Hydro-mechanical Works
Barrel Gates
Barrel Gates Fixed wheel with upstream skin plate and upstream seals.
No. of bays 4 (four)
Clear width 4.50 m
Clear height of gate 5.50 m
Sill level 265.50 m
Maximum Water Level 273.70 m (FRL)
Design head 8.2 m
Type of wheel assembly Wheel mounted on corrosion resisting Steel axle with
roller bearings and having line contact with track.
Type of side and top seals Rubber, music note (hollow)
Type of bottom seal Rubber, wedge
Lowering/raising speed of hoist 50 cm/minute
Centre to centre side seals 4500+ 150 mm
Centre of the centre wheels/tracks 4500 + 400 mm
Approx weight of each gate 4500 + 400 mm
Approx hoist capacity for each gate 25 tonne 4500 + 400 mm
Trashracks at Intake structure of Forebay
Type of trash rack Inclined
No. of bays 9 (nine)
Clear width 3.4 m
Total vertical height of trash rack 16.2 m
Sill level 258.50 m
Full supply level 273.00 m
HFL 273.0 m
Differential head for design 6 m
Approx. weight of one section of Trash rack considering six (6) Sections per bay 2.5 tonne
Intake Gates at Forebay
Type of Gate Fixed wheel with downstream skin plate and downstream seals
No. of bays 3 (three)
Clear width 3.32 m
Clear height of gate 6.30 m
Sill level 258.50 m
Full Supply Level 273.00 m
Design head 14.5 m
Type of wheel assembly Wheel mounted on corrosion resisting Steel axle with roller bearings and having line contact with track
Type of side seals Teflon cladded, rubber, music note (solid)
Type of bottom seal Rubber, wedge
Lowering/raising speed of hoist 50 cm/minute
Centre to centre side seals 3320 + 150 mm
Centre of the centre wheels/tracks 3320 + 400 mm
Approx weight of each gate 15 tonne
Approx hoist capacity for each gate 30 tonne
Type of trash rack Inclined
Draft Tube Gates
Type of gate Vertical lift, slide type downstream skin plate anddownstream sealing,non regulating type
No. of bays Six of clear width of 4.2 m each
No. of gates required Two seal gates having bottom, side & top isolating one unit.
Total height of one gate 3.20 m + requirement fortop seal
Sill level 244.0 m
Max. TWL 258.00 m
Design head 14.00 m
Type of side & top seals Rubber, music note (hollow)
Type of bottom seal Rubber, wedge
Lowering/raising speed of hoist 0.75 m/minute to 1.5 m/minute
Centre to centre side seals 4200 + 150 mm
Centre to centre thrust pads 4200 + 400 mm
Approx. weight of each gate 8 tonne
Automatic Tilting Gates at Spill Channel
Type of Gate Fish belly with upstream skin plate Automatic with counter weigh
No. of bays 2 (Two)
Clear width 9.5 m
Clear height of gate 3.2 m
Sill level 269.80 m
Maximum Water Level 273.00 m (FRL)
Design head 3.2 m
Electro-mechanical WorksCharacteristic of Turbine
Type Kaplan (Vertical)
Nos. 3
Runner dia. 2.7 mc.
Operating load range 40% to 110% d.
Permissible speed rise Not more than 50 %e.
Permissible pressure rise Not more than 40% of designheadf.
Turbine efficiency 92 %
Characteristic of Generators
Type Three phase synchronous
Rated output at 0.9 pf lag and normal rated terminal voltage 8.88 MVA
Continuous overload capacity 10%
Normal rated terminal voltage 11 kV
Rotational speed 187.5 rpm
Rated frequency 50 Hz
Short circuit ratio on rated MVA base 1.0
Efficiency at 8.88 MVA, 0.9 pf lag, 50 Hz, not less than 98%
Characteristic of Generator Transformers
Type Three phase
Rating 9.78 MVA
Cooling type ONAN/ONAF
Switchyard
Voltage level 11/132 kV
No. of bays 3
Size 65 m (L) x 55 m (W)
Annual Energy Generation
At 46.53% load factor (As per availability of water) 97.82 Million units
Cost Estimates
Total Cost 182.53 crores
Civil works 127.62 crores
E&M Works 54.91 crores
IDC 12.89 crores
Subsidy 11.70 crores
Total Cost considering IDC and subsidy 183.72 Crores
Cost of installation per MW 7.65 crores
Generation Cost/kw
At 46.53% load factor (As per availability of water) Rs. 3.63
Return on Equity (Pre-tax)
For first 10 years 19 %
11th year onwards 24 %
Construction Period
months 30