Renewable:
1. dam1.jpg: https://commons.wikimedia.org/wiki/File:Barrage_Oued_Kasseb_**_beja_02.jpg by Elarbi alaeddin / CC BY-SA 3.0
2. dam2.jpg: https://commons.wikimedia.org/wiki/File:Bekes-dam_duzzaszto.jpg by László Szalai / public domain
3. dam3.jpg: https://commons.wikimedia.org/wiki/File:Grand_Coulee_Dam_spillway.jpg by David Brodbeck / CC BY 2.0
4. dam4.jpg: https://commons.wikimedia.org/wiki/File:Takato_Dam_discharge.jpg by Qurren / CC BY-SA 3.0
5. dam5.jpg: https://commons.wikimedia.org/wiki/File:Kanjirapuzha_dam_2.JPG by Shijualex / CC BY-SA 3.0
6. geothermal.jpg: https://commons.wikimedia.org/wiki/File:G%C3%A9iseres_del_Tatio,_Atacama,_Chile,_2016-02-01,_DD_56-57_HDR.JPG by Diego Delso / CC BY-SA 4.0
7. solar1.jpg: https://commons.wikimedia.org/wiki/File:Solar_cooker_1.jpg by Nadya Peek / CC BY 2.0
8. solar2.jpg: https://commons.wikimedia.org/wiki/File:%22Sungril%22_solar_cooker_photo1.jpg by Fluffyarse / CCO 1.0
9. solar3.jpg: https://commons.wikimedia.org/wiki/File:White_Cliffs_solar_plant.jpg by Richard Gifford / CC BY 2.0
10. solar4.jpg: https://commons.wikimedia.org/wiki/File:Hybrid_Solar_Energy_System.jpg by ENERGY.GOV / public domain
11. solar5.jpg: https://commons.wikimedia.org/wiki/File:PV_installation_for_fish_cooling_in_Baleia_CE.jpg by Riosolar / CC BY-SA 4.0
12. solar6.jpg: https://el.wikipedia.org/wiki/%CE%91%CF%81%CF%87%CE%B5%CE%AF%CE%BF:Solar_Vaccum_Tube_Thessalonikiv2.jpg by 23x2 / CC BY-SA 3.0
13. solar7.jpg: https://commons.wikimedia.org/wiki/File:University_Park_MMB_B2_Built_Environment.jpg by mattbuck / CC BY 2.0
14. solar8.jpg: https://commons.wikimedia.org/wiki/File:Solarmodul_Sonnenkollektor_01_KMJ.jpg by KMJ / CC BY-SA 3.0
15. windmill.jpg: https://commons.wikimedia.org/wiki/File:Chesterton_Windmill.jpg ny G-Man / Public domain
16. windmill1.jpg: https://commons.wikimedia.org/wiki/File:Campo_de_Criptana_Molinos_de_Viento_2.jpg by Lourdes Cardenal / CC BY-SA 3.0
17. windmill2.jpg: https://commons.wikimedia.org/wiki/File:Tuuleveski_Muhul1.jpg by Hendrix / CC BY-SA 3.0
18. windmill3.jpg: https://commons.wikimedia.org/wiki/File:Podersdorf_Windm%C3%BChle_2008_a.JPG by Joadl / CC BY-SA 3.0
19. windmill4.jpg: https://commons.wikimedia.org/wiki/File:Pala_eolica_Mele_04.jpg by Alessio Sbarbaro / CC BY-SA 3.0
20. windmill5.jpg: https://commons.wikimedia.org/wiki/File:Steenmeulen_(Terdeghem).jpg by Lion59 / CC BY-SA 3.0
21. windmill6.jpg: https://commons.wikimedia.org/wiki/File:Windmill.jpg by xavigaya / GPL
22. windmill7.jpg: https://commons.wikimedia.org/wiki/File:Saint-Vaast_en_Cambresis_Le_Moulin.jpg by J.c.houd / CC BY 1.0
23. windmill8.jpg: https://commons.wikimedia.org/wiki/File:Aalbeke.-_le_Hoogmolen,.JPG by PIERRE ANDRE LECLERCQ / CC BY-SA 4.0
24. windmill9.jpg: https://hy.wikipedia.org/wiki/%D5%8A%D5%A1%D5%BF%D5%AF%D5%A5%D6%80:Cyclades_Mill.jpg by Wolfgang Staudt / CC BY-SA 2.0
25. windmill11.jpg: https://commons.wikimedia.org/wiki/File:Vestast_S%C3%BCderdeich.JPG by Dirk Ingo Franke / CC BY-SA 2.0 DE
26. windmill12.jpg: https://commons.wikimedia.org/wiki/File:Ellezelles_JPG02.jpg by Jean-Pol GRANDMONT / CC BY 2.0
27. windmill13.jpg: https://commons.wikimedia.org/wiki/File:Moulbaix_MV1cJPG.jpg by Jean-Pol GRANDMONT / CC BY-SA 3.0
28. windmill14.jpg: https://commons.wikimedia.org/wiki/File:Trapani_Windmill.jpg by Francesco Pappalardo / CC BY 2.0
29. windmill15.jpg: https://commons.wikimedia.org/wiki/File:Tehachapi_wind_farm_3.jpg by Stan Shebs / CC BY-SA 3.0 
