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India : NEW DELHI: NHPC agreed to offer 300-MW unallocated power to ASSAM.

The National Hydroelectric Power Corporation (NHPC) has finally decided to deliver unallocated power of 300-MW to Assam from the Subansiri (Lower) Hydroelectric Power Project, over and above 233-MW from the sub-lower Hydroelectric Project.

According to the Power Ministry s note on the new status of the controversy-ridden 2000-MW project, the Technical Advisory Committee (TEC) set up by the Planning Commission has reviewed the several matters and following its suggestion, the Dam Design Review Panel (DDRP) was created, and then the DDRP, in its suggestion, has authenticated the seismic design standard approved in the design of the project.

The Ministry note has also stated that the Joint Steering Committee (JSC) has made assessment on all downstream matters and the NHPC has decided to apply its advice with a value of Rs 470 crore. Decision on supplying 300-MW unallocated power to Assam has also been taken, over and above delivery of 233-MW of power to the North-eastern state from the sub-lower Hydroelectric Project, which comprises 25-MW and 208-MW of free and paid power respectively.

The note has added that some of the design improvements in the energy dissipation arrangement (EDA) have been advised as added safety moves to alleviate the fears uttered by several sections of the society on the dam s safety. Plus, the minimum volume of nonstop flow, which stood at 6 cumec and one of the main apprehensions, has been assessed and then decision on retaining minimum nonstop flow of 250-300 cumec operating one unit continuously has been taken, added the note.

The Power Ministry has claimed that benefits will surpass the minor unfavorable effects on downstream as the venture will develop economy, transform lifestyle and flourish the area.

Several anti-dam groups, including SU and Krishak Mukti Sangram Samiti, are worried over the downstream impact in Assam from the Subansiri Lower Project. Due to this, the project has failed to make any headway for past few years.

On flood control, it has been claimed that the Subansiri Lower Project is a run-of-the-river project with small pondage for peaking power, plus to ease the floods during Monsoon through operating the reservoir at lower level. The project will alleviate floods via flood lessening through controlled release of water into the river. During floods, the reservoir will be run 15 m under the Full Reservoir Level (FRL) with flood cushion of 442 Mcum.

As it has been intended at alleviating floods of the Subansiri River, the operation in synchronization with Subansiri (middle) and upper can restrain hundred-year return flood under SLP.

The Thatte Committee has emphatically said that flood alleviation without dams is not possible. In the Subansiri Basin, integrated reservoir operation of the Subansiri lower, middle and upper is essential to facilitate flood control in the downstream effectively.

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Publication:Mena Report
Date:Nov 21, 2013
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