How to correctly write "Solar and wind powered" in a sentence? Are hyphens required?

Possible options:

  1. Solar and wind powered
  2. Solar- and wind-powered
  3. Solar and wind-powered
  4. Solar and windpowered

Hyphens are optional, but if you do use them, use the style of (2), otherwise use spaces as in (1). A hyphen can stand for a common second element in all but the last word of a list, e.g.:

You may see a yield that is two-, three-, or fourfold.

Hyphen (Oxford Dictionaries)

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