looduses esinev fossiilkütus (nt põlevkivi, nafta) vm loodusvara (nt tuul, vesi), millest saadakse (elektri)energiat või mida kasutatakse soojuse ja sooja vee tootmiseks,jõudu, energiat andev vahend
inglise keelesEnergy sourcenatural fossil fuels (e.g. oil shale, oil) or other natural resources (e.g. wind, water) from which (electric) energy is obtained or used for the production of heat and hot water,power,energy-generating means
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