Renewable Energy, Biogas & Geothermal Energy

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Across
  1. 4. Water vapor used in turbines
  2. 5. Industrial facility
  3. 7. Related to renewable energy
  4. 8. Organic matter used as fuel
  5. 10. Related to biogas source
  6. 12. Our planet
  7. 13. Used in geothermal systems
  8. 16. Gas produced from organic waste
  9. 19. Naturally replenished energy
  10. 21. Ability to generate electricity
Down
  1. 1. Element in greenhouse gases
  2. 2. Pollution-free energy
  3. 3. Moving air energy
  4. 4. Energy from the sun
  5. 6. Device to move fluids
  6. 9. Source of solar energy
  7. 11. Heat energy from inside Earth
  8. 13. Form of thermal energy
  9. 14. Rotating machine used to generate power
  10. 15. Tank for biogas production
  11. 17. Capacity to do work
  12. 18. Fuel in gaseous form
  13. 20. Type of energy (electric form)