Which machines can provide the mechanical power needed to turn electric generators?

Electric generators require mechanical power to function, which is typically provided by devices known as prime movers. These machines convert energy from natural sources—such as moving water, wind, or fuel—into the rotational mechanical energy needed to turn a generator's shaft.12

Common machines that provide this mechanical power include:

• Turbines: These devices extract energy from a fluid stream to rotate a shaft. They are categorized by the fluid used:
  • Water turbines: Utilize the potential energy of water at dams or waterfalls.13
  • Steam turbines: Driven by steam produced through the combustion of fossil fuels or nuclear fission.13
  • Gas turbines: Burn gas directly to generate power.13
  • Wind turbines: Capture the kinetic energy of wind.13
• Internal-combustion engines: Devices such as gasoline engines and diesel engines are frequently used to drive electric generators, particularly in applications like locomotives or portable power units.142