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Across 2. Splitting atoms to release energy (7) 3. element that is an input into a nuclear power station. (7) 7. The DRC and France use very different amounts of this energy source. (8) 8. Sixth largest natural gas producer. (6) 12. The building of the Karahnjukar dam project caused destruction of this sort. (7) 14. Revolution where fighting and beheading were not amongst the main activities (10) 17. Money related disadvantage when building a nuclear power station.(9) 19. This dominated the fuel mix in the 19th Century. (4) 20. Fuel used mostly before the 19th Century (4) 21. This natural energy source depends on specific sites. (10) 22. This lasts very long and makes nuclear energy dangerous.(13)

Down 1. Second largest oil producer. (6) 2. A relatively new technology extract gas from shale rocks. (8) 4. Because of climate change many people protest against the use of this fuel type. (6) 5. Renewable energy resources can help a country become more (4)-(10) 6. Japanese nuclear disaster site. (9) 9. Advantage of nuclear energy. (8) 10. Icelanders can be grateful for this kind of plate boundary that provides heat. (12) 11. Reserves of this non-renewable energy source are not spread evenly on the planet. (3) 13. This percentage of the world's energy needs is being supplied by HEP, wind and solar.(5) 15. Fifth largest coal producing country. (9) 16. Electrical output measurement from a large electrical generation plant. (8) 18. Cheapest renewable energy option (5)