Lower Subansiri Hydro Electric Project 8×250 MW
Location: ARUNACHAL PR.
Capacity: [MW 8 X 250]
Located on the Assam – Arunachal Pradesh border. It envisages installation of 8 Units of 250 MW each. The concrete gravity dam to be constructed as a part of the project will be 116 m high, and will be located 2.3 km upstream of Gerukamukh village in Dhemaji district of Assam. Besides, the project entails construction of 8 Nos. 225 m long Head Race Tunnels (HRTs), Tail Race Tunnels (TRTs) and pressure shafts. The left bank of dam will be in the state of Assam and the right bank of dam and power house will be in the Lower Subansiri district of Arunachal Pradesh. The project will generate 7421.59 MU of energy in a 90% dependable year. The Power house is to be built underground with 8 Units of 250 MW each. The main components of the project are a 116 m high concrete gravity dam, 8 horse-shoes shaped Head Race Tunnels each of dia. 9.5 m and length 225m to 390 m, 8 Pressure shafts of dia. 8m, 8 nos. horse shoe- shaped Tail Race Tunnels each of dia. 9.5 m & length 450 m to 780 m and an underground powerhouse cavern of size 24m x 62.4 m x 337 m to accommodate 8 units of 250 MW each. Completion cost of the project indicated is Rs.7304.69 crores including IDC of Rs.749.11 crores. Financing pattern is in the debt eqity ratio of 70:30. Sale rate of energy at busbar in the first year of commissioning works out to Rs.1.93 per unit. Once commissioned, it will be the largest hydro-electricity plant in the country.
Present Status:River diversion has since been completed (December,2007). Work on other 7 tunnels are in progress. Excavation in respect of intake structure, Head Race Tunnel, Pressure Shaft and Surge Shaft chamber are in progress. The project has faced frequent interruptions. Work suffered due to power house back hill slope failure and consequent disruption of access to DAM & Intake. External expert committee has visited the site in April and submitted the report. Action on the suggestions has been taken up. Revised drawing for restoration of PH backhill slope has been issued. Surge chamber has been modified into 8 nos Surge tunnels. Portal development for surge tunnel adit has been started. The slide treatment work at PH back slope slide area is in progress at EL 171M-145M. E&M and HM works are under progress. Progress is affected due to delay in signing of MOU with state govt and also due to law and order problem in the project area.
August 30th, 2010 at 5:59 am
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