Across
- 2. Earth heat energy
- 4. Air-powered energy
- 5. Organic energy source
- 10. Alcohol fuel
- 11. Gaseous fossil fuel
- 12. Power distribution network
- 15. Poisonous substance
- 16. Ocean motion energy
- 18. Coal oil gas
- 20. Energy generation site
Down
- 1. Plant-based diesel
- 3. Water-powered energy
- 6. Flowing electric power
- 7. Carbon-based fuel
- 8. Organic fuel material
- 9. Basic systems
- 13. Crude oil
- 14. Energy emission
- 17. Atomic energy source
- 19. Sun-based energy