Hydropower is product by water.It cost nine cents per hour but you also need to by the turbine,powerhouse,transformer,and control gates.Also you need to build the dam to hold the water.the water behind the dam gose through a pipe to the turbine and back out the other side. The turbine spins by the force of the water and the turbine rotates the generator.the generator produces electicityand sends it to power lines bring it to homes and busnesess and other places