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1. 1.

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   ACROSS

   3. At dams, large reservoirs of water are used to tap this form of energy (5,8)
   5. The hot interiors of the earth is a source of this energy (3,7)
   7. Fuel used to run a car (6)
   8. Energy from breaking up of atoms (6)
   9. A torch uses energy stored in these (5)
   11. Light bulbs use this form of energy (11)
   12. Big machines that run on wind energy (9)

   DOWN

   1. Green plants trap energy from the sun during this process (14)
   2. Energy from the sun (5)
   4. Soft, black, fuel-rock (4)
   6. In a car, electric energy is stored in this (7)
   10. Cooking gas used at home (3)