Introduction :  The 99MW Chuzachen Hydroelectric Power Project is about 60 Kms from Gangtok (Sikkim) and 100 Kms from Bagdogra Airport (West Bengal)        Location : East District of Sikkim   Stream : Rangpo and Rongli  Vicinity : Chuzachen Village  Project Highlights :  Chuzachen a (Run-of-the-River) Hydroelectric Power Project with two interconnected reservoirs with an installed capacity of 99MW.The Rangpo river is a major tributary of the Teesta river which is the main river of the state of Sikkim.The Chuzachen has two intakes each with a storage reservoir and headrace tunnel each joining together to a common headrace tunnel,an underground surge shaft,a surface penstock and open air powerhouse with two units and an outdoor switchyard.    Rainfall : 250-300 cm p.a  Dam(Rangpo)    Type : Concrete,Gravity   Dam height : 48 m  Dam Volume : 83,000 m3   Dam(Rongli)    Type : Concrete,Gravity   Dam height : 41 m  Dam Volume : 45,200 m3   Headrace Tunnel(Rangpo)  Length : 2578 m  Internal Diameter : 3.3m  Headrace Tunnel(Rongli)  Length : 2258 m  Internal Diameter : 4m  Common Headrace Tunnel(Chuzachen)  Length : 3225 m  Internal Diameter : 4.6 m   Surge Shaft    Internal Diameter : 12 m  Height : 103.9 m  Surface Penstock    Length : 801.2m   Diameter : 3.3m  Power House    Type : Out door   Turbine type : Francis,vertical  Generators : 2 Nos. each 49.5 mw

2 X 49.50 MW CHUZACHEN HYDRO-ELECTRIC POWER PROJECT – Sikkim

Prasad & Company was awarded the execution of various civil works for the 2 x 49.50 MW Chuzachen Hydro Electric Power Project as a Joint Venture with SEW in Sikkim for M/s GATI Infrastructure Limited, Hyderabad. The Project execution is in progress and heading for timely completion.

Hydel Power-Chuzachen Hydroelectric Project

Execution of various civil works for implementation of Chuzachen Hydroelectric Power Project.

Client: GATI Infrastructure Ltd

Location: Chuzachen, Sikkim

Project Name:

Chuzachen Hydroelectric Project (99 MW)

Country: IndiaDescription: The proposed project activity is a run-of-river project with a small reservoir located

at Rangpo and Rongli rivers. The generated electricity will be exported to the Eastern Power Grid of India. It is estimated that the project activity will generate 484.1 GWh and reduce 491,178 tCO2eq annually.

Gati Infrastructure Ltd.- Chuzachen

 110 MW Chuzachen Hydro Electric Power Project.Quick Facts

Location

: East District of Sikkim

Stream : Rangpo and Rongli

Vicinity : Chuzachen Village

 HightlightsThe Rangpo river is a major tributary of the Teesta river which is the main river of the state of Sikkim.The Chuzachen has two intakes each with a storage reservoir and headrace tunnel each joining together to a common headrace tunnel, an underground surge shaft, a surface penstock and open air powerhouse with two units and an outdoor switchyard. FeaturesRainfall - 250-300 cm p.a Dam(Rangpo)

Type : Concrete,Gravity

Dam height : 48.6 m

Dam Volume : 81,000 m3

 Dam(Rongli)

Type : Concrete,Gravity

Dam height : 39.6 m

Dam Volume : 45,200 m3

 Headrace Tunnel(Rangpo)

Length : 2604 m

     

Internal Diameter

: 3.55 m

 Headrace Tunnel(Rongli)

Length : 2077 m

Internal Diameter

: 3.1 m

 Common Headrace Tunnel(Chuzachen)

Length : 3239 m

Internal Diameter

: 4.55 m

 Surge Shaft

Internal Diameter : 12 m

Height : 103.9 m

 Surface Penstock

Length : 645 m

Diameter : 3.3 m

 Power House

Type : Out door

Turbine type : Francis,vertical

Generators : 2 Nos.each 49.5MW

  Board of Directors

Mr. V T Pawar

Mr. Nitin Aggarwal

Mrs. Meera Madhusudhan

Project Details

 Project Status Report as On 15th February, 2007 Hon'ble Chief Minister, Govt of Sikkim, Dr Pawan Chamling formally laid the Foundation Stone for the Chujachen HEPP on 06.02.2007. 

    POWER HOUSE: An Outdoor Power House is located on the right bank of Rangpo River with 2 unit bays with out door Switch yard is located near to the Power House.

Civil Works: All civil works for power house, fire water tank, switch yard control building and tail race channel have been completed

Electro-Mechanical Works: Erection of works Unit-1 & 2 Generator Rotor & Stator, Turbine & generator shaft coupling, GSU transformers have been completed. Switch Yard erection & commissioning works completed.

Hydro-Mechanical works: All HM works have been completed.  

  RANGPO DAM:It’s a concrete gravity dam with incorporated ungated spillway & 2 Nos. of bottom outlet gates with radial gates. The Intake structure is located on the left ban, upstream of the dam axis.

Civil Works:All excavation work and intake concreting has been completed. Concreting of final 3 blocks in under final stages.

Hydro-Mechanical Works:Erection work of radial gates, second stage embedded parts for silt barrier gate, intake gate and trash rack has been completed. DIVERSION TUNNEL:(Total length of DT 400 Mtrs.) - Completed.

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 RONGLI DAM: It’s a concrete gravity dam with incorporated ungated spillway & 2 Nos. of bottom outlet gates with radial gates. The Intake structure is located on the right bank, upstream of the dam axis.

Civil Works: All excavation, concreting and curtain grouting works have been completed

Hydro-Mechanical Works: Erection work of radial gates, stoplog gates, silt barrier gate, intake gate and trash rack has been completed.

DIVERSION TUNNEL(Total length 172 Mtrs.) Completed.

HEADRACE TUNNEL:Completed only lining in final stages. Only 3000 m3 lining is left

Rongli Head Race TunnelRongli HRT is located on the right side of Rongli River. It has a length of 2077 m and an internal diameter of 3.10 Mtr. It joins together with Rangpo HRT to form the common HRT Chuzachen.

Rangpo Head Race TunnelRangpo HRT is Located on the right side of Rangpo river. It has a length of 2604 m and an internal diameter of 3.55 Mtr. It joins together with Rongli HRT to form the common HRT Chuzachen.

Chuzachen Head Race TunnelThis HRT is located below the ridge between Rangpo & Rongli Rivers. It has a length of 3239 m and an internal diameter of 4.45 m.

Civil Works: The Project has five Adits, necessitated as to facilitate construction of the Main Head Race Tunnel which stand completed. The total length of the Main Head Race tunnel is 7920 Mtr. Excavation of whole Head Race Tunnel is completed. Concrete lining of the headrace in currently in advanced stages of completion.

 

 SURGE SHAFT: At RD 2735 m of Chuzachen HRT a surge shaft is located. It is a vertical shaft 137m with diameter of 12 m for top 90 m length & diameter of 4.45 m for bottom 47 m length.

Civil Works: All excavation, concrete lining and grouting works have been completed.

 PENSTOCK:A surface penstock (length 645 m, diameter 3 – 3.3 m) connects Chuzachen HRT to Power House. It is supported by 6 Nos. of Anchor Blocks & 22 saddle bearings.

Civil Works: complete Civil Work is done

Mechanical Works: Complete penstock erection is done.

 

 TOP

 Power Evacuation: The power will be evacuated through a 132 KV double circuit line from switchyard of Chuzachen H.E.P.P

All foundation works and tower erection has been complete. Stringing of TL is in final stages of completion 

  Infrastructure Facilities

Road Works :The Company on its own is doing following two Roads

Chuzachen to Adit-2 & Rangpo Dam Road (Length – 5 Km)

Chuzachen Valve House Road (Length – 3.4 Km)

The roads constructed is not only being used for the project but it has benefitted the locals of the vicinity.

Roads are being maintained by the comapny on a continues basis. All types of vehicles are plying on both these Roads and the transportation work is happening in normal course.

Explosive Magazines: 2 Nos. of Explosive Magazines - one at Power House and other near Adit-2 having 1.8 M.T. capacity & 10 M.T. capacity respectively have been constructed and licenses have been obtained from Chief Controller of Explosives, Kolkata.

Stores Buildings: One store for Cement (250 MT Capacity) and One General Store for storing the equipments and spare parts have been constructed at Rongli Dam site.

Weigh bridge : A weight bridge for weighment of incoming/issued quantities of cement, steel etc is operational at Rongli Dam Site.

Steel Yard, Capacity for storing 1500 MT of steel has been created at site.

Township and Offices : Location of township has been planned and identified near the power house site. Presently well established office, fully furnished guest houses and staff accommodations are operational in rented accommodations at Site and Gangtok.New office premises have also been taken on lease at Gurgaon (NCR) in well known office complex “Signature Tower”.

11 KV Power line: 11 KV power line for supply of power to all components of the project namely all Adit’s, Diversion Tunnel, Power House, Dams, Valve House and Surge Shaft has been specifically taken by us from Sikkim Government. Sufficient capacity is available in the form of standby Diesel Generating Sets at various locations.

2 X 49.50 MW Chuzachen Hydro-Electric Power Project

Prasad & Company was awarded the execution of various civil works for the 2 x 49.50 MW Chuzachen Hydro Electric Power Project as a Joint Venture with SEW in Sikkim for M/s GATI Infrastructure Limited, Hyderabad. The Project execution is in progress and heading for timely completion.

Chuzachen Hydroelectric Project (99 MW)

Name of CDM Project Activity : Chuzachen Hydroelectric Project (99 MW)Status : ValidationRegion : AsiaHost Party : IndiaOther Parties Involved : N.AProject Participants – Authorized by Host Party : GATI INFRASTRUCTURE LIMITED.Project Participants – Authorized by other Parties involved : N.AType of Project : Hydro powerSupplemental Information : Run of riverScale : largeMethodology : ACM0002Crediting Period : 10Validator : TV NORDStarting Date of a CDM Project Activity : 27-Mar-07Starting Date of the Crediting Period : 1-Apr-10End of crediting period : 31-Mar-20Starting Date of Public Comments : 20-Sep-08Annual ERs (tCO2/y) : 491,178Aver Annual ERs (tCO2/y) : 490774.623597044Total ERs by 2012 (tCO2) : 1473534

Total estimated ERs by 2020 (tCO2) : 4911780Total estimated ERs by 2030 (tCO2) : 4911780

Chuzachen Hydro Power Plant, India

Description of projectChuzachen hydroelectric power plant (110 MW) is located in the east district of Sikkim on the Rangpo and Rongli rivers. It is a run-of-river plant with storage capacity to supply peak load during the low flow season. The high head scheme consist of two interconnected reservoirs, a headrace tunnel system, an 800 m long surface penstock, and a powerhouse, housing two Francis turbines (2 x 55 MW).

AF in energy

Development of general layout, optimizing the harnessing of the water from Rangpo and Rongli rivers before their confluence, detail design.