Video narration
How can a wall of water light a house? Think of water rushing from a hose: moving water can push or spin something. At a hydropower plant, the dam holds water high above the river, storing energy because of that height. Here's the important turn: the dam does not make electricity. Water is released through a passage and rushes downhill. Its force spins a turbine, a set of blades designed to rotate. The turbine's shaft keeps turning inside a generator. The generator changes that spinning motion into electrical energy. That electricity travels out through power lines to the grid, while the water continues downstream and rejoins the river. So the chain is simple: water held high becomes moving water; moving water becomes turbine motion; turbine motion becomes electricity. A hydropower plant lights a house because falling water spins a turbine, and the turbine turns a generator.