| Subject | English | Latvian |
| environ. | energy source Potential supplies of energy including fossil and nuclear fuels as well as solar, water, wind, tidal and geothermal power | energoavots |
| 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 | energonesējs |
| energ.ind. | energy source material | energoavots |
| energ.ind. | energy source material | enerģijas avots |
| 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 | nepiesārņojošs enerģijas avots |
| energ.ind. | non-renewable energy source | neatjaunojams energoresurss |
| 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 | atjaunojams enerģijas avots |
| nat.sc. | renewable energy source contribution | ieguvums no atjaunojamiem energoresursiem |
| energ.ind. | source of energy | energoavots |
| energ.ind. | source of energy | enerģijas avots |
| environ. | use of waste as energy source | izmantot atkritumus kā enerģijas avotu |