How power plants produce electricity

Electricity is generated by converting some other form of energy into electrical energy, and the many kinds of power plant differ mainly in the primary source they draw on and in how they capture it. Animations are well suited to explaining these systems because they show the flow of water, steam, air or charge through a plant and reveal the working parts that a still diagram leaves static. Most large plants share a final stage: a turbine spins a generator, which produces the current.

In a hydroelectric plant, water held behind a dam or flowing in a river is allowed to fall, and its motion turns a turbine connected to a generator; the higher the drop and the greater the flow, the more power is produced. A nuclear power plant uses the heat released by splitting atomic nuclei to boil water into steam, and the steam drives the turbine, much as burning fuel does in a conventional thermal plant. Cooling towers, often the most visible feature of such stations, release waste heat by evaporating water.

Renewable systems use natural flows directly. Wave power devices extract energy from the rise and fall or surge of ocean waves and convert it into electricity. Solar technologies take two main forms: photovoltaic cells turn sunlight straight into current, while a solar chimney uses the sun to heat air under a large collector so that the warm air rises through a tall tower and spins turbines on the way up. Seeing each process animated makes clear what they have in common — turning a source of motion or heat into rotation — and how renewable and conventional plants meet the demand for sustainable energy.

Frequently asked questions

What do most power plants have in common?

In most plants a turbine is made to spin and drives a generator that produces electricity; the plants differ chiefly in what they use to turn the turbine.

How does a nuclear plant make electricity?

It uses the heat from splitting atomic nuclei to boil water into steam, and the steam turns a turbine connected to a generator.

What is a cooling tower for?

A cooling tower releases waste heat from a thermal or nuclear plant, usually by evaporating water, so the plant can keep operating efficiently.