Project: Teesta - III, Sikkim (Commissioned)

Capacity

6 x 200 MW

Location

State

Sikkim

District

North District

River

Teesta

Contract Duration

54 Months

Contract Value

INR 2498.23 Crores (US$ 384.73 Millions)  (1 US$=INR 65)

Project Status

Work in progress. Expected commissioning June,2016

Technical Features

Gross Head

797m

Net Head

780.33 m

Rated Discharge per Unit

21.17  m3/s

Civil Works

Head Race Tunnel

7.5m, Modified Horse Shoe, 12.9 Km

Construction Adits for HRT

6.5m x 6.5m, 1.3 Km

Other construction Adits

6.5m x 6.5m, 2.2 Km

Tail Race Tunnel

8.0m x 8.0m, 1.3 Km long

TRT Manifolds

4.8 x 8.2 m, 488m long

Main Access Tunnel

8.0m x 8.0m, 541m long

Cable Tunnel

8.0m x 8.0m, 663m long

Other additional tunnels

Various Dia., 0.9 Km long

Surge Shaft

13.0m diameter, 158m high

Vertical Pressure Shaft

2 Nos., 644m each, 4.0m Dia.

Inclined Pressure Shaft

2 Nos., 469m each, 4.0m Dia.

Horizontal Pressure Shaft

663m, 4.0m/3.25/2.5m Dia.

Underground Power House

214.5m x 21.3m x 45.0m

Transformer Cavern

181.63m x 15.8m x 31m

Infra Works

Roads

28 Km

Permanent Colony

25000 sq. ft.

Office Buildings

15000 sq. ft.

Bridges

1 permanent concrete bridge and 3 nos. temporary bridges.

Temporary colonies

120000 sq. ft.

HM Works

Pressure Shaft Steel Lining

11764 MT

Intake Trash Rack

7.0m x 2.30m, 36 Panels

Fixed Wheel Gate for Intake

7.5m x 7.5m, 1 No.

Radial Gate for Spillway Tunnel-1

12.0m x 7.0m, 1 No.

Fixed Wheel Gate for Spillway Tunnel-1

12.0m x 9.9m, 1 No.

Radial Gate for Spillway Tunnel-2

11.0m x 14.0m, 1 No.

Fixed Wheel Gate for Spillway Tunnel-2

11.0m x 13.3m, 1 No.

Radial Gate for Chute Spillway

11.0m x 14.5m, 1 No.

Fixed Wheel Gate for Chute Spillway

11.0mx17.85m, 1 No.

Radial Gate for Flushing Tunnel

9.0m x 9.3m, 1 No.

Fixed Wheel Gate for Flushing Tunnel

9.0m x 11.6m, 1 No.

Radial Gate for Silt Flushing

2.0m x 1.5m, 2 No.

Bonnet type slide gate for Silt Flushing Tunnel

2.0m x 1.5m, 2 No.

Fixed Wheel Tail Race Gates

4.8m x 6.9m, 3 No.

Fixed Wheel Gate for De-silting

5.5m x 7.5m, 4 Nos.

Fixed wheel gate for Diversion Tunnel

6.0m x10.30 m, 2 No.

Hinge Gate for the Inspection of Desilting Chamber

2.5m x 2.5m, 2 No.

Hinge Gate for the Inspection of HRT

3.5mx3.5m, 2 No.

Hinged type Adit Gate for Abandoned Adit

2.5mx2.0m , 1 No.

Manhole for Adit 3 and 4 of HRT

1m diameter, 2 No.

Butterfly Valve for Surge Shaft

4m diameter, 2 No.