There are two main ways to ta Electricity is produced in the hydroelectric plant by the action of water against a turbine connected to a generator. Energy is in the form of mechanical energy as it turns the turbine. ke water and use it to generate electricity in a hydroelectric power plant. The first way is called Blank 4 Question 15 , which is when some of the water from a river is diverted to a penstock and flows to a power plant. The second way is called Blank 5 Question 15 , which is used to flood water upstream to create a reservoir - this water can then be used to flow to the penstock and turn to the turbine