#alternative_energy__alternativeenergy  energy derived from sources that do not use up natural resources or harm the environment
  supertype:  energy  (physics) the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"
  subtype:  solar_energy__solarenergy__solar_power__solarpower  energy from the sun that is converted into thermal or electrical energy; "the amount of energy falling on the earth is given by the solar constant, but very little use has been made of solar energy"
  subtype:  wind_generation__wind_power  power derived from the wind (as by windmills)

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