• Hydroelectric power, or hydropower, harnesses the energy of water moving down a stream.
  • Hydropower is the most widely used form of renewable energy in the world.
  • It provides almost one fifth of the world’s electricity.
  • The energy of waves and tides can also be used to produce water power.
  • To harness water power, a stream must be dammed.
  • Narrow valleys are the best for dams.
  • Water power does have problems.
  • A large dam stops a stream's flow, which floods the land upstream.
  • People may be displaced.
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