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"Hydro electric power station are not perennial power station". Justify.

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Justification: The water utilized by the hydro power plants comes mostly from storage dams/reservoirs which get filled up during the monsoon rainy season. Such reservoirs are utilized for supplying water to various purposes to: e.g. 1) Water drinking storage 2) Agriculture/ irrigation purpose and third purpose is generation of electricity Since rainfall is depends on nature which is fluctuating/ uneven so water in reservoirs should be properly used till next monsoon season. i.e. for purpose of : 1 ) Water drinking storage 2) Agriculture/ irrigation purpose 3) and not for generation of electricity Because first two purposes are important. Hence "Hydro electric power stations are not perennial power station" 

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