Teesta - Ministry of Power

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Rangit Basin 26 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) The hydropower development of Rangit river was identified in four stages as under : i) Rangit HE Project Stage –I The Rathong chu, a major perennial tributary of Rangit river has a very steep bad slop. The river takes a big loop near Yoksum. It is proposed to divert the water of Rathong chu at an elevation of about 2300 m U/S of Yoksum to elevation of 100 m near village Thingtom. The scheme shall generate 47 MW of power at 60 % load factor. ii) Rangit HE Project Stage-II It is proposed to divert the water of Rimbhi chu near Sigglitem and allow the water to drop through 425 m near Lingchum on Kalet chu to generate 10 MW of power at 60% load factor. iii) Rangit HE Project Stage –III A dam has been constructed just d/s of confluence of Rathong chu and Rangit river and a power house near the village Mongbru. The installed capacity of the scheme is 60 MW. The project has been commissioned by NHPC in the year 1999 and is in operation. iv) Rangit HE Project Stage-IV The scheme shall utilize a drop of 110 m from an elevation of 440 m to 355 m in Reshi loop. The scheme shall generate 18 MW of power at 60 % load factor. Schemes For PFR in Teesta Basin The Cenrtral Elecrtricity authority entrusted 10 schemes with total installed capacity of 1680 MW for preparation of prefeasibility reports as per details given below: Sl. No. Name of Scheme Installed Capacity Name of River District 1. Dikchu 105 MW Bakchachu/Dikchu chu East 2. Rongni 195 MW Rongni chu East 3. Namlum 160 MW Rangit South
27 Preliminary Feasibility Report Teesta (I) HE Project (4 x 80 MW) 4. Panan 200 MW Tolung chu North 5. Lingza 160 MW Ringpi North 6. Rangyong 141 MW Rangyong/ Umramchu North 7. Ringpi 70 MW Ringpi North 8. Rukel 33 MW Rukel/Rangyong North 9. Jedang 185 MW Jhonak chu North 10. Teesta Stage-I 320 MW Teesta & Zemu chu North Subsequently the Jedang scheme was replaced by Lachen scheme (210MW) and Namlum scheme by Talem scheme (75MW). OTHER SCHEMES IDENTIFIED BY CEA AND SIKKIM The CEA in the preliminary ranking studies and Sikkim in the preliminary studies identified the fallowing schemes: Sl. No. Name of Scheme Installed Capacity 1. KalepHE Project 40 MW Teesta 2. Talem HE Scheme 65 MW Teesta Name of River 3. Serum HE Scheme 50 MW Lachung Chu 4. Lachung HE Scheme 30 MW Lachung Chu/Sebokong Chu 5. Chhota Pathing/Rolep 55 MW Rangpo Chu 6. Chuzachen 13 MW Rangpo Chu 7. Suntalitar HE Scheme 25 MW Rangpo Chu 8. Mana 37 MW Rangit 9. Gompa 46 MW Rangit
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Page 4 and 5: TITLE LIST OF PLATES Preliminary Fe
Page 6 and 7: Preliminary Feasibility Report Tees
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Page 10 and 11: Dam Top EL.3270 m River bed level a
Page 12 and 13: SILT FLUSHING TUNNELS (for both the
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Page 16 and 17: 1.3.5 Environmental Aspects 10 Prel
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Page 26 and 27: Table 2.1 POWER SUPPLY POSITION OF
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Page 36 and 37: 10. Rammam Stage-I 70 MW Rammam 11.
Page 38 and 39: 4.1 INTRODUCTION CHAPTER-IV TOPOGRA
Page 40 and 41: Group Lithology 31 Preliminary Feas
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Page 48 and 49: 5.1 GENERAL CHAPTER -V HYDROLOGY 38
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Page 64 and 65: 28°0' 27°45' 88°15' PAKI CHU 88
Page 66 and 67: Year TEESTA BASIN PROJECTS 56 Preli
Page 70 and 71: TEESTA-I H.E PROJECT AVERAGE 10-DAI
Page 74 and 75: Discharge (cumec) 55 50 45 40 35 30
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73 Preliminary Feasibility Report T
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6.2.7.2 Tail Race Tunnel 75 Prelimi
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6.4.1.8 Instrument And Remote Contr
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6.4.2.5 Silt Flushing Tunnel Gates
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Preliminary Feasibility Report Tees
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90% Dependable Year: 84 Preliminary
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Table-7.1 DISCHARGE DATA 86 Prelimi
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PERIOD Table-7.5 92 Preliminary Fea
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INCREMENTAL (DMU/DMW) 2.60 2.40 2.2
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Table-7.7 (B) 96 Preliminary Feasib
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Table-7.7 (D) 98 Preliminary Feasib
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Table-7.7 (F) 100 Preliminary Feasi
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Table-7.7 (H) 102 Preliminary Feasi
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Table-7.7 (J) 104 Preliminary Feasi
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Table-7.7 (L) 106 Preliminary Feasi
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Table-7.7 (N) 108 Preliminary Feasi
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Table-7.7 (P) 110 Preliminary Feasi
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Table-7.7 (R) 112 Preliminary Feasi
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Table-7.7 (T) 114 Preliminary Feasi
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9.2 PHYSICAL ENVIRONMENT 9.2.1 Clim
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120 Preliminary Feasibility Report
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9.6.5 Impacts on Socio-Economic Env
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10.1.3 Power Availability 140 Preli
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11.2.10 Tail Race Tunnel: 149 Preli
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Sl. No. Name of Work Unit Quantiy D
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CHAPTER -XII COST ESTIMATES 152 Pre
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2.13 Consultant’s fees including
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S. N. ABSTRACT OF COST OF C - WORKS
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S. No. COFFER DAMS (FOR BOTH THE DA
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S. No. SPILLWAYS (FOR DAM-I & DAM-I
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S. No. INTAKE STRUCTURES (FOR BOTH
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S. No. ADITS 170 Preliminary Feasib
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S. No. SURGE SHAFT 172 Preliminary
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S. No. POWER HOUSE COMPLEX 174 Prel
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S. No. HYDRO MECHANICAL EQUIPMENT 1
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S. No O-MISCELLANEOUS 182 Prelimina
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S. No. V - RECEIPT & RECOVERIES 190
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13 14 15 16 17 18 Custom Duty @22%
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Year Estimated Cost at June 2003 P.
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CALCULATION OF ENERGY RATE WITH PRE
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TALEM H.E PROJECT R.B.L- EL. 3630 F
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TALEM HYDRO ELECTRIC PROJECT (3 X 2
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27° 47' LOHNAK CHU 3400 U/S COFFER
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H.R.T. 4.0 MØ H.S. SHAPE (FROM DAM
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L10 ? L9 L8 L7 PARAPET L6 ? L5 ? 17
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HRT4000 Ø FROM DAM-I 32Ø 5000 LON
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The rock types encountered in the a
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SEISMOTECTONICS AND SEISMICITY Seis
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interbanded and are expected to pro
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founded on sandy soil is higher tha
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X Some well built wooden structures
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1940 8 2 3 3 59 . 0 28 . 00 90 . 50
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1988 5 10 7 16 16 . 1 25 . 32 90 .
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1997 1 25 20 8 28 . 7 30 . 00 88 .
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2000 10 3 17 8 22 . 4 26 . 88 89 .
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REPLY OF COMMENTS OF CEA (HP & I )
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REPLY ON COMMENTS OF SP&PA DIVISION
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Sikkim is on the higher side as the
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of the project on the fast track ba
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Consistency of data Water availabil
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YEAR/ MONTH I 1976 II III I 1977 II
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