GoAP – Nyamjang Chhu Hydroelectric Power Plant 780 MW – Arunachal Pradesh - Project Profile
"GoAP – Nyamjang Chhu Hydroelectric Power Plant 780 MW – Arunachal Pradesh - Project Profile" contains information on the scope of the project including project overview and location. The profile also details project ownership and funding, gives a full project description, as well as information on contracts, tendering and key project contacts.
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The Government of Arunachal Pradesh (GoAP) is planning to construct a hydroelectric power plant in Arunachal Pradesh, India.
The project involves the construction of a 780MW run-of-river hydroelectric power plant comprising six units of 130MW each on 255ha of land.
Out of 255ha of land, 10.08ha will be a private land and 244.46ha community land.
The project includes the construction of a 151.75m long and 11.2m high barrage, 10 gated spillways of 10m length with apron and abutments, three sluice ways, a 52.3m head regulator, six single excluder ducts, six feeder channels of 52.8m width, six basins, a tunnel intake, river diversion works, a compaction for ground improvement, concrete diaphragm wall, jet grouting, hydro-mechanical works and other infrastructure-related facilities, the installation of turbines, generators and transformers, and the laying of transmission lines.
The project also includes the construction of a 23.45km long and 6.2m diameter head race tunnel (HRT) requiring extensive tunneling in a geologically fragile landscape and comprises eight de-silting chambers and with underground power house having 6×130 MW pelton turbines. The HRT bypasses around 3500m stretch of river between barrage and the powerhouse.
The project is planned to be implemented through public-private partnership (PPP) mode on build-own-operate-transfer basis (BOOT) basis.
Indo Canadian Consultancy Services Ltd (ICCS) has been appointed as the design consultant for the project.
In March 2007, Bhilwara Energy Ltd (BEL) signed a memorandum of understanding (MoU) with the GoAP to develop the project on BOOT basis for the concession period of 40 years.
NJC Hydro Power Ltd (NHPL), a special purpose vehicle (SPV) and a wholly owned subsidiary of BEL will execute and operate the power plant.
The feasibility study for the project was completed in 2008 by WAPCOS Ltd & RS Envirolink Technologies Pvt. Ltd.
On May 29, 2009, NHPL signed a memorandum of agreement (MOA) with the GoAP for the project.
In January 2012, NHPL invited bids for the civil works under package I, IIA, IIB and III.
The scope of package I includes the upstream works of barrage, the construction of gated spillway with apron and abutments, sluice ways, head regulator, shingle excluder ducts, feeder channels, basins and collector pool, tunnel intake, silt flushing arrangement, river diversion works, a compaction for ground improvement, concrete diaphragm wall, jet grouting, hydro-mechanical works and other associated works. The deadline for submission of bids was April 23, 2012.
The scope of package IIA includes the construction of a head race tunnel from RD 434.5m to RD 13175.9m, a sand flushing tunnel, adits to head race tunnel, Taksang chhu scheme and related hydro-mechanical works.
The scope of package IIB includes the construction of a head race tunnel from RD 13175.9 m to 25136.8 m and adits to head race tunnel. In August 2012, tenders were re-invited for packages IIA and IIB with a submission deadline October 1, 2012.
The scope of package III includes the underground powerhouse cavern, transformer & GIS cavern, main access tunnel, GIB and ventilation tunnel, pressure shaft, valve house, MIV cavern, surge shaft, adits, tailrace tunnel, switchyard, hydro-mechanical works and other associated works. The deadline for submission of bids was April 23, 2012.
In June 2012, bids for the turbine generator package were invited under package V. The scope of the package includes the design, manufacture, supply, transport, erection, testing and commissioning of 6 Pelton turbine generator, governor, main valve, static excitation and associated auxiliaries, unit – control SCADA automation, two penstock protection valves and communication system for the project. The deadline for submission of bids was September 28, 2012.
In 2013, project was placed on hold due to financial and environmental issues.
In April 2015, National Green Tribunal (NGT) suspended the environmental clearance granted by the Union Environment Ministry.
In September 2015, the Expert Appraisal Committee for Ministry of Environment, Forest and Climate Change (MoEFCC) recommended the Environmental Clearance for the project.
BEL filed an appeal before NGT for the environmental clearance of the project.
On April 7, 2016, NGT ordered to carry out a fresh study which includes public consultation for the environmental clearance approval.
The project is facing delay as it is facing oppositions from local communities due to environmental issues.
Planning Authority: Central Electricity Authority
Study Consultant: WAPCOS Ltd, RS Envirolink Technologies Private Ltd
BOOT Contract: NJC Hydro Power Ltd, a SPV of Bhilwara Energy Ltd
Design Consultant: Indo Canadian Consultancy Services Ltd
The project involves the construction of a 780MW (6x130MW) run-of-river hydroelectric power plant on 255ha of land in Tawang district, Arunachal Pradesh, India.
The US$1,032 million project includes the following:
1. Construction of a 151.75m long and 11.2m high barrage
2. Construction of 10 gated spillways of 10m length
3. Construction of three sluice ways
4. Construction of a 52.3m head regulator
5. Construction of six single excluder ducts
6. Construction of six feeder channels of 52.8m width
7. Construction of six basins
8. Construction of 6.2m diameter and 23.45km long Head Race Tunnel
9. Construction of a concrete diaphragm wall
10. Construction of a powerhouse
11. Installation of turbines
12. Installation of generators and transformers
13. Laying of transmission lines
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