| Subject | English | Italian |
| el. | a source of electrical power in which the energy liberated in radioactive decay is collected as heat and converted,usually directly by thermocouple action,into electricity | generatore termoelettrico a radioisotopi |
| energ.ind. | alternative energy source | fonte energetica sostitutiva |
| environ., energ.ind. | alternative, environmentally friendly energy source | fonte alternativa compatibile con l'ambiente |
| energ.ind. | domestic energy source | fonte di energia domestica |
| transp., energ.ind. | energy source | sorgente di energia |
| environ. | energy source Potential supplies of energy including fossil and nuclear fuels as well as solar, water, wind, tidal and geothermal power | fonte di energia |
| med. | energy source | fonte energetica |
| med. | energy source | sorgente energetica |
| med. | energy source | batteria |
| environ. | energy source material Sources from which energy can be obtained to provide heat, light, and power. Energy resources, including fossil and nuclear fuels as well as solar, water, tidal and geothermal energy, may be captured or recovered and converted into other energy forms for a variety of household, commercial, transportation, and industrial applications | sorgente di energia |
| energ.ind. | energy source material | fonte energetica |
| environ. | energy source material | sorgente di energia |
| energ.ind. | energy source material | fonte di energia |
| nucl.phys. | high energy neutron source | sorgente di neutroni ad alta energia |
| gen. | high energy source of ignition | sorgenti di accensione ad alta energia |
| IT, el. | internal energy source | fonte di energia interna |
| environ. | non-polluting energy source Energy that is ecologically safe and renewable. The most widely used source is hydroelectric power, which currently supplies some 6.6% of the world's energy needs. Other non-polluting sources are solar energy, tidal energy, wave energy and wind energy. Most non-polluting energy sources require a high capital investment but have low running costs | fonte di energia non inquinante |
| energ.ind. | non-renewable energy source | fonte energetica non rinnovabile |
| energ.ind. | non-renewable primary source of energy | energia primaria non rinnovabile |
| nat.sc. | photon energy source | punto energetico in fotoni |
| energ.ind. | primary energy source | sorgente di energia primaria |
| energ.ind. | primary energy source | fonte primaria di energia |
| commun., transp. | radio reserve source of energy | fonte di energia di riserva per apparecchio radar |
| energ.ind. | rechargeable reserve energy source | riserva di energia ricaricabile |
| environ. | renewable energy source Energy sources that do not rely on fuels of which there are only finite stocks. The most widely used renewable source is hydroelectric power; other renewable sources are biomass energy, solar energy, tidal energy, wave energy, and wind energy; biomass energy does not avoid the danger of the greenhouse effect | fonte di energia rinnovabile |
| nat.sc. | renewable energy source contribution | contributo di energie da fonti rinnovabili |
| nat.sc. | renewable energy source contribution | contributo delle fonti energetiche rinnovabili |
| stat., el. | source energy | energia alla fonte |
| energ.ind. | source of alternative energy | fonte energetica sostitutiva |
| energ.ind. | source of energy | fonte di energia |
| astr. | source of energy | sorgente di energia |
| energ.ind. | source of energy | fonte energetica |
| med. | source of energy | sorgente energetica |
| environ. | use of waste as energy source | valorizzazione energetica dei rifiuti |
| environ. | use of waste as energy source | valorizzazione energetica (dei rifiuti) |