What is alternator or generator in hydropower plant? All Questions › Category: Electrical Power Generation › What is alternator or generator 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 An alternator or generator will produce electricity. When turbine rotates, the generator also rotates because turbine is coupled with the generator.