Unlimited energy may refer to:

  • Perpetual motion, a device or system that delivers more energy than was put into it
  • Sustainable energy, the provision of energy such that it meets the needs of the present without compromising the ability of future generations to meet their needs
    • Renewable energy, energy that uses natural resources that may be naturally replenished

See also

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  • Free energy suppression, a conspiracy theory that says that technology that could produce unlimited energy is being suppressed by special interest groups