What is penstock in hydropower plant? All Questions › Category: Electrical Power Generation › What is penstock in hydropower plant? 1 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 This is the way between the dam and turbine which helps to improve the kinetic energy of the water. It is built up of stainless steel.