alternative energy

noun
energy, as solar, wind, or nuclear energy, that can replace or supplement traditional fossil-fuel sources, as coal, oil, and natural gas.

Origin:
1970–75

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World English Dictionary
alternative energy
 
n
Also called: renewable energy a form of energy derived from a natural source, such as the sun, wind, tides, or waves

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

alternative energy

usable energy derived from replenishable sources such as the Sun (solar energy), wind (wind power), rivers (hydroelectric power), hot springs (geothermal energy), tides (tidal power), and biomass (biofuels).

Learn more about alternative energy with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
If solar follows this path, it could be bad for the entire alternative energy
  industry.
Alternative energy is also catching on in parts of the developing world where
  it's a necessity, not a choice.
Companies might spend money on alternative energy sources.
Alternative energy projects make make money at the high price, will not repay
  their investment at the low price.
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