What is reservoir in hydropower plant? All Questions › Category: Electrical Power Generation › What is reservoir in hydropower plant? 0 Vote Up Vote Down Chetan Shidling asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down Chetan Shidling answered 4 years ago The idea of this reservoir is to collect the water which will be further used to produce electricity. The water will be collected during the rainy season. By saving water we get potential energy.