FORM-'A'

FCi'm for seeking prior approval under section 2 of the proposals by: the State Governments .and other authorities

PART-I (to be filled up by user agency)

1 , Project details i. Short narrative of the proposal To explore the hydro-potential of River Chu, and project/scheme for which Govt. of entrusted the development of the forest land is required hydroelectric projects in Tawang basin to NHPC for survey and investigation and preparation of PFR I DPR.

The development envisaged utilization of water of Riv0f Tawahg Chu, formed by joining of two rivers - Mago Chu and Nyukcharong Chu. River Tawang Chu cruises i;;)Qut 45 km in India and just after the conflu

Based on available topographical, geologic<:Il ?lnd hydp)­ meteorological data, it was envisaged the! ihe entire hydropower potential of Tawang Chu b3tween Nuranang Chu Power House and border can be harnessed by contemplating two schemes viz" Tawang HE Project Stage I and Tawang HE Project Stage II in a cascade manner, Based on preliminary investigations a Preliminary Feasibility Report (PFR) of these projects in T awang basin was preparsd for preparation of Detailed Project Report (DPR) and development of hydropower potential of this basin,

On establishment of the feasibility of the projects GO'I!. of Arunachal Pradesh entrusted implementation of Tawang HE Project Stage I and Tawang HE Project Stage II to NHPC by signing Memorandum of Agreement (MoA) on 21.09.2006. Revised MoA was again signed between NHPC and Gov!. of Arunachal Pradesh on 24.06.2007 for execution of these projects.

After detailed survey and investigation, OPR of Tawang HE Project Stage II (800 MW) was prepared, Tawang HE Project Stage II is a run of the river s ~heme and envisag~s construction of 28 m high ReC Raft Barrage across Tawang Chu at Yusum I Kudung and Khet villages of Tawang District (15 km downstream of forebridge near Jang), diverting the water through 15.989 km long and 9 m diameter horseshoe shaped Head Race Tunnel for generation of 800 MW (4 x 200 MW) of power by utilizing gross head of 494 m and constructing an underground Power House on right bank of River Tawang Chu at village Kungba and about 300 m w/s of confluence of Tawang Chu with Nyamjang Chu near Bhutan Border, The water from turbines shall be discharged back to river through one 170 m long and 9 m diameter horseshoe shaped tail race tunnel. Area under submergence at FRL will be 6.19 ha.

Nearest broad gauge railheads are at Guwahati & Nagaon and the nearest airport is at Tezpur.

Salient features of the project are enclosed as Annex'A'.

ii. Map showing the required Map placed as Annex 'B'. forest land, boundary of adjoining forest on a 1 :50,000 scale map

iii. Cost of the project The project is estimated to cost Rs. 6247.99 crores including IDC cost of Rs. 1382.81 crores and financing charges Rs. 32.80 at June 2009 price level.

iv. Justification for locating the Power is the most important and essential input for project in forest area economic development of state and country. Hydropower is essentially required for quality power i.e. for the grid stability. The greatest merit of hydropower is its suitability, durability, variability and economic viability. Tawang H.E. Project Stage II is one of the two projects for harnessing hydropower potential of Tawang Chu river in a cascade manner. The necessity for development of Tawang H.E. Project Stage II to contribute for the economic and social development of Arunacahal Pradesh has been well acknowledged by Govt. of Arunachal Pradesh.

Location of the project Barrage and other components have been finalized after investigating various alternatives. The present site chosen for the barrage suits more as the river in this particular reach is quite flat and sufficient river width is available to pass the design flood. The geological investigation reveals that there is an overburden of the tune of 25-30 m in the river bed and nearly 5-10 m in the left bank whereas on the right bank the rock is expected at 20-25 m below the ground level. Only 62 families are likely to be affected due to land acquisition required for the construction of Tawang H.E. Project Stage II. The project· has been found commercially viable and generation from the project shall mitigate the miseries of power-starved industry and people in the eastern and north-eastern states of India.

v. Cost-benefit analysis (to be Cost-benefit analysis placed as Annex 'C'. enclosed) vi. Employment likely to be The execution of Tawang H.E. Project Stage II wiU generated accelerate economic activities in the area, resulting creation of job opportunities for the benefits of local inhabitants as well as outside traders for around 43,80,000 man days.

trnlilT~ '-"~';""i<'" ,-.... ,NHPC Ud I ...,.,. mo~,(>T\"'O . ·;T~O\l''-'''o. ' it t +;-;,.';;"" ~~ ~/Neh!uNlal c. ;M<' ·... r,~'-q\t:t"'~.. } . .\Ptad~~h,' .. } '; :v'l",,~ 1:f;W I Alunacha, .. Tawang H.E. Project Stage-II (800 MW) lo{ '.tion-wise requirement of land for the proposed roads

, Length width Area Area SI.No. Proposed roads Location (m) (m) (sq. m) (Ha) " (I) Sakyur 1700.00 15 25500.00 . 2.55 1 Stage-II Barrage Complex to MDA-2 (Ii) Thrillam 442.00 15 6630.00 0.66 (I) Thrillam 1178.60 15 17679.00 1.77 2 MDA-2 to MDA-3 i (ii) Bulkyung 857.16 15 12857.40 1.29 MDA-3 to mangnam Nala for Adit-III 3 i and TWII-G4 Bulkyung 1135.74 15 17036.10 1.70 i 4 Mangnam nalato Adlt-III Mangnam 3214.00 15 48210,00 4.82 (i) Mangnam 1821.47 15 27322.05 2,73 5 Mangnam nala to TWII-G4 i (ii) Hoongla 642.87 15 9643,05 0,96 6 TWII-G4 to Hoongla nala Hoongla 700.00 15 10500.00 1.05 7 Hoongia nala to Adlt-IV Hoongla 720.00 15 10800.00 1,08 8 Hoongla nala to MDA-4 Poito 1450.00 15 21750.00 2.18 (I) Polto 580.00 15 8700.00 0.87 9 MDA-4 to MDA-S (ii) Dugumba 400.00 15 6000.00 0.60 (i) Saw 2035.76 15 30536.40 3.05 10 M DA-5 to Stage-II PH Complex (Ii) Kungba 1285.74 15 19286.10 1.93 11 Kungba road to Adit IV CFA Kungba 300,00 15 4500.00 0.45 12 Thrillam to Main Office and Colony Site Thrillam 1800,00 15 27000.00 2.70 Total;' 20263.34 303950.10 30.40

Length of the roads is based on the map submitted to Forest Dept!. 3, Details of displacement of people due to the project, if any

i. Number of families No family will be displaced due to the project. However, about 62 families are likely to be affected due to land acquisition required land for the construction of Tawang H.E. Project Stage-II,

ii. Number of Scheduled Casles I All the families belong to Scheduled tribe. Scheduled Tribe families iii. Rehabilitation plan,(lo be enclosed) R & R Plan enclosed as Annex '0'

4. Whether clearance under Yes Environment (Protection) Act, 1986 required? (Yes/No)

5. Undertaking to bear the cost of Undertaking attached as raising and maintenance of Annex 'E' & 'F' compensatory afforestation and/or penal compensatory afforestation as well as cost for protection and regeneration of Safety Zone, etc, as per the scheme prepared by the State Government (undertaking to be enclosed) 6, Details of Certificates/documents Annex 'A' - Salient features of project enclosed as required under the Annex '8' - A map on 1 :50000 instructions Annex 'c' - Cost·benefit analysis Annex '0' - R & R Plan Annex 'E' - Certificate of Undertaking for compensatory afforestation. Annex 'F' - Certificate of Undertaking for NPV

Signature ~,'Ur . (A,K.Mishra) G neral Manager T awangt Basin Projects _ .~ NHPC Ltd" Nehru Market, ~~I",liljilr~ l!f.!lr'i1iI..m;J'~ .eg~in~roj.cIPO & Distl, Tawang -790 104. [r"loTJtfQ't)O~;ot1;J, , INNPCL tel.. (Arunachal Pradesh) Date: ~~ t~~. ,;.'rern lil1f"rut'IQ(lrK,e1. r~'N;)t~f Place: 1p',Jrrf,,'rq 1J79l': ~( J~~(:i l:';~ Pfd:t\(,tr:~\f.. i U1t. State serial Klo. of proposal 9JJ1 Fa IS/fIll (To be filled up by tl1e Nodal Officer with da! of (eceipt) Tawang H.E. Project Stage II

TAWANG H.E. PROJECT STAGE-II (800 MW)

SALIENT FEATURES

2.1 LOCATION

II State Arunachal Pradesh

II District Tawang

I:t River Tawang Chu

I:t Barrage Site Yusum Village. (15 km dIs of Forebridge near Jang)

II Nearest BG rail head Guwahati & Nagaqn

II Nearest airport Guwahati &Tezpur

I:t Latitude 27°32'48"

I:t Longitude 91°49'57"

2.2 HYDROLOGY

II Catchment area 3419 sq.km. " Rainfed area 2535 sq.km.

n Snowfed area. 884 sq.km.

I:t Location of catchment

o Latitude 2T27'30" to 28°22'00"

o Longitude 91°47'30" to 92°27'00"

I:t Average annual rainfall (at Yusum) 2665 mm

II Maximum temperature 31.1 ·C

I:t Minimum temperature -2.9°C

II Max 10 daily discharge 344.3 cumee

II Min 10 daily discharge 38.2 cumec

~~(£><'» iunJr ~ !!~ifTl!/Tawanp Projects 1 ll;'Io·~otftomo~o/:.. ; Ud. ~~, 1'imrr/Nehn,i.';, ;,ang ~I<>UJi'tlM tRw!Arunachal Pr.d~~iI·79()1 04 - '" ":c.'. ",.. ~ '.,'", ,ri­ '.,:, .':'," " Tawal1g H.E. Project S:'1;;e - II

2.3 RESERVOIR •

II Full Reservoir Level (FRL) EL 1536m

II Min. Draw Down level (MDDL) EL 1534 m

II Gross storage

a at FRL 72.17 Ham

o at MDDL 60.32 Ham

II Area under submergence at FRL 6.19 Ha

2.4 DIVERSION TUNNEL

II Number One

II Size B.50m

II Shape Horseshoe

II Length 580m Diversion capacity 733 cumee (Monsoon, 1 :25 Year)

II Height of u/s Coffer Dam 14.0m

II Height of dIs Coffer Dam 7.0m a DT Inlet gate a Number 2

a Size(WxH) 3.5x8.5 m

2.5 BARRAGE a Type RCC Raft with Pier a Top elevation EL 1538 m

II Crest Elevation EL 1512 m a Downstream Floor Level EL 1505.5 m a Length at top 124 m

II Thickness of dIs Raft Sm

II Upstream Floor Level EL 1510 m a Upstream Floor Thickness 2m

II Thickness of Pier 3.5m n Height . 28 m ,k ..aw--~ .' 2 .-~) iIlW iIf~ tlftmurnr~/l awang Basi" Pr~j.ct. l.l;'I'01:[c:r"tftomol('!'o INHPC Ltd. ~' 1::ff1~7., o'mrrINchru Mmkfii' l':mJ!l!nl't Tawang H.E. Project Stage- II

2.6 SPILLWAY •

l::t Design,flood 13300 cumec

l::t Type Orifice

l::t Crest Elevation EL 1512 m

l::t Number & Size of Spillway opening

o Number (including one 8 emergency bay)

.0 Size (Wx H) 10 x 14.75 m

l::t Energy dissipation Stilling Basin with End sill

2.7 INTAKE

II Invert Level EL 1520 m

II Number 2

II Size of Gate opening 6.5 x 6.5 m each '" Trash Rack Inclined type

II Size of Trash Rack (W x H) 11 x 12.5 m each

2.8 DESILTING CHAMBERS

!l Type Dufour llNumber 2

!l Size (W x H) 18 x 23 m '" Length 450m

l::t Design discharge per chamber 129.40 cum

!l GOC Floor EL 1541 m

II Outlet Gate 6.5 x6.5 m

2.9 SILT FLUSHING TUNNELS Branch Tunnels a Number . 2

II Shape & Size (WxD) 2.0 x 1.5 m, 0 - Shape

l::t No. of Gates in Each Tunnel 2 Nos. (One service & one emergency) . '" Size of Gate 2.0x1.5m ~

3 • ""'- A' "~.c» :mm ql"~ QIt

• Il SFT Size & Shape 2.0 x 3,5 m, D-Shape

2.10 HEAD RACE TUNNEL n Number 1

l:! Size 9m

l:! Shape Horseshoe o Length 15.989 km

Il Design Discharge 187,09 cumec

II Overload discharge : ,224.50 cumec

2.10;1 Adits

II Length of Adit No, 1 312 m o Length of Adit No,2 173m

II Length of Adit NO.3 364m o Length of Adit No.4 317 m

Il Length of Adit No,S 391 m :a Length of Mit NO.6 155 m

Il Inspection gate in Adit No.1 ,3 & 6 2,0 x 2.0 m each

2.11 SURGE SHAFT

l::I Number 1 a Type Orifice type open to Surface o Size 20m o Shape Circular

II Top Elevation EL 1600 m

.0 Upper Expansion Gallery 6.5m dia D-shape, 150m long o Lower Expansion Gallery 7.5m dia D-shape, 150m long n Maximum Up Surge EL 1595.5 m

J:l Minimum Down Surge EL 1472.5 m

J:l Height 132 m

J:l Gate Size S.6X 5.6 m

4 i~il'}'~< Tawal1g H.E. Project Stage - II

2.12 PRESSURE SHAFT I VALVE CHAMBER 2.12.1 From EL1t461.8 to El1296.0 m o Number :2 o Type : Underground, Steel lined o Shape : Circular o Diameter : 5.6m o Length upto Bifurcation : 514.0 m 2.12.2 From EL1296.0 to EL1038.0 m

l:I Number :4

l:I Type : Underground, Steel lined o Shape : Circular

Il Diameter : 4.0m o Length : 621.0 to 698.0 m

2.12.3 Valve Chamber (At EL1296.0 m)

Il Size (LxWxH) : 104 x 12 x20 m

2.13 MIV

Il .Type : Spherical

Il Diameter : 2.5m

2.14 POWER HOUSE

Il Type : Underground

Il Instal/ed capacity : 800MW

Il Number of units :4 n Powerhouse cavern size (LxWxH) : 190 x 22 x56.0 m

Il Turbine Axis Elevation : EL 1038.0 m n Type of Turbine : Francis Vertical Axis

Il Max. Gross Head : 494m

Il Rated Net Head : 479m

. '1'ITilT11tI\lm~Tawang~~Basin Pco/eets 5 t1;f0'!0fomomoWro /NHP;:; Ltd. ~~, m/NehruMarket. Tawang ·""nallliuM ~,..... _.... "'_I"'~~.,1~_' ...... ' 1'awallg HE Project Stof

• 2.15 TRANSFORMER CUM GIS CAVERN CUM DRAFT TUBE GOC

!l Cavern Sir:e (LxWxH) : 173 x 17.5 x 29.5 m '" Draft Tube Gate

0 Number :4

0 Size : 4.0 x4.5 m

2.16 TAILRACE TUNNEL

. Jl Number : 1

!l Size : 9m

Jl Shape : Horseshoe

!l Length : 170 m

!l Design Discharge : 187.09 cumec

!l Tailrace Surge Gallery : 7.0 m dia D-shaped, 300 m long " HFL at TRT outlet : EL 1058.25 m

Il Max. TWL : EL 1044.6 m

Il Min. TWL (one unit Running) : EL 1043.0 m

II TRT outlet gate

0 Number :2

0 Size : 4:0 X 9.0 m (H)

2.17 POTHEAD YARD

II Size : 40x210m

2.18 ,POWER GENERATED

Il Installed capacity ': 800MW

II Annual energy generation. in 90% : 3697.Q4 MU dependable year 2..19 PROJECT COST AND TARIFF

II Project Cost : Rs; 6247.99 Crores

II Sale Price at Bus Bar/Unit : Rs. 3.94/Unit PART-II (To befdled by the concerned Deputy Conservator 0/Forests) 7. Location ofthe Project/Scheme. i) State/Union territory : - Arunachal Pradesh ii) District : - Tawang District iii) Forest Division :- Social Forestry Division, Tawang iv) Area offorest land including underground : - 116.62 Ha. (Against Tawang HE Project area proposed for Diversion (in hal. Stage II ofNHPC). Total land required 237.88 ha (Forest Cover 96.95 ha, Non-Forest Cover 121.26 ha & Underground 19.67 ha) v) a) Legal status offorest :- Unclassed Forest b) Forest type : - Class-VI f Himalayan Dry Deciduous Forest vi) Density of vegetation : - 0.5 (Dense) vii) Species-wise (Scientific names) and diameter class wise enumeration oftrees (to be enclosed. In case of irrigationIHydel projects enumeration at FRL, FRL-2 meter and F'RL4 meter enclosed. : - Attached as Annexure-II viii) Brief note on vulnerabllity ofthe forest area to erosion. : - Rocky and stable, not vulnerable to erosion. ix) Approximate distance ofproposed site for : - No notified forest in this division. The diversion from boundary offorest. Proposed site ofdiversion is within the Unclassed forest area x) Whether forms part ofnational Park, Wildlife sanctuary, Biosphere reserve, Tiger reserve, Elephant corridor, etc (If so, The details ofthe area and comments ofthe Chief Wildlife Warden to be annexed). :-No. xi) Whether rare/endangered/unique species :- No rare and endangered flora and fauna is offlora and fauna found in the area if so details found reported from the proposed project thereof. area. xii} Whether any protected archaeological heritage site/defense establishment or any other important monument is located in area. Ifso, the details thereof with NOC from : - No competent authority, ifrequired. 8. Whether the requirement offorest land as Proposed by the User Agency in col2 ofpart-I is unavoidable and barest minimum for the project. : The proposed area is the barest If no, recommended area item-wise with details minimum and unavoidable. of alternatives examined. 9. Whether any work in violation ofthe Act has been carried out(YeslNo). if yes, details ofthe same including period ofwork done action taken: - No on erring officials. Whether work in violation is still in progress. 10. Details ofcompensatory afforestation scheme i) Details ofnon-forest area/degradedfforest area : - Maps enclosed herewith. Single patch of identified for compensatory Afforestation, its 194.00 ha degraded Community Land. distance from adjoining forest, number of patches, size of patch. ., -:"!' ­

PART-llI

ITSLbe til.L"cLlli1 by the cOllc~rned ChiefCollservator ofForests)

1. Whether site, where the forest land involved is :- Yes, I have inspected the Forest land located has been inspected by the concerned involved for diversion, for construction of Chief Conservator of Forests (Yes/No.), if yes, Tawang Basin H.E. project 0115.4.201.1. the date of the inspection & observation made in Details inspection note enclosed. form of inspectionllo(e to be enclosed.

2. Whether the concerned Chief Conservator of the :- Yes, I agree with the informatiOtlS given Forests agree with the information given in the by the DFO concerned in Pati-I1 Part-II and recol11mendation of Deputy Conservator Forests.

3. Specific recommendation of concerned Chief :- The Hydroelectric Project after implemRllta­ Conservator of Forests for acceptance or otherwise tion provide the clean energy to the energy of the proposal with detailed reasons. starved backward state and also improve the Socioeconomic conditions ofthe local tribal people. The project is a part ofthe 50,000 MW Hydropower initiative of Govt. oflndia. Recommended for acceptance by competent authority.

\ r....-\\ Signature -.---­ ___ .--_- __\\"c_:l. ______

Name:- Sri G.N.Roy

Chief Conservator" of Forests Western Circle:: Banderdewa Date ;- II til Apri1/2011.

Place:- Banderdewa Arunachal Pradesh .' .' PART-IV (Co be filled up in by the Nodal Officer or Principal Chief Conservator of Forests or Head of Forest Department.)

17, Detailed opinion and specific recommendation of the State Forest Department for acceptance of otherwise of the proposal with remarks::

(While giving opinion, the adverse comments made by the concerned Conservation of Forests or Deputy Conservation ofForests should be Categorically reviewed and critically Commented upon).

Date: (~.1·11 Place:~~ PART-V ( To be filled in by the Secretary in charge of Forest Department or by any 0 authorized officer of the State Government not below the rank of an Under Secretar

18. Recommendation of the State Government (Adverse comments made by any officer or authority in Part-B or Part·Cor Part·D above should be specially commented upon)

Date: lS· J; hJ't

Place: .L~~_(XAJ__V