Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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Across: 2. Unit of energy 5. You see these farms in the hills 6. Fraction of energy put in that's useful 8. Flow of energy that warms things up 9. Alternative name for kilowatt-hour 10. Uses falling water to generate electricity 12. Sustainable energy 14. Energy from the nuclei of atoms 17. Another word for heat 18. These will run out

Down: 1. Rate of converting energy 3. Movement energy 4. From hot rocks 7. Provides much of our sustainable energy 11. Drives the tides 13. Sustainable energy 15. Car that runs on electricity or petrol 16. Rock that is used as a fuel