| Subject | English | Spanish |
| 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 | generador termoeléctrico de radioisótopo |
| energ.ind. | alternative energy source | fuente de energía sustitutiva |
| environ., energ.ind. | alternative, environmentally friendly energy source | fuente de energía alternativa y no nociva para el medio ambiente |
| energ.ind. | domestic energy source | fuente energética para el hogar |
| commun., el. | dynamic source of energy | fuente de energía no estática |
| polit. | energy source | fuente de energìa |
| environ. | energy source Potential supplies of energy including fossil and nuclear fuels as well as solar, water, wind, tidal and geothermal power | fuente energética |
| transp., energ.ind. | energy source | fuente de energía |
| construct. | energy source | energético |
| environ. | energy source material | material de origen energético |
| 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 | material de origen energético |
| energ.ind. | energy source material | fuente energética |
| energ.ind. | energy source material | fuentes de energía |
| energ.ind. | energy source material | fuente de energía |
| nucl.phys. | high energy neutron source | fuente de neutrones de alta energía |
| gen. | high energy source of ignition | fuente de ignición de alta energía |
| IT, el. | internal energy source | fuente de energía interna |
| environ., energ.ind. | low-carbon energy source | fuente de energía de baja emisión de carbono |
| nat.sc., energ.ind. | National Swedish Board of Energy Source Development | Junta nacional sueca para el desarrollo de las fuentes de energía |
| 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 | fuentes de energía no contaminantes |
| energ.ind. | non-renewable energy source | fuente de energía no renovable |
| energ.ind. | non-renewable primary source of energy | energía primaria agotable |
| gen. | Potatoes are an important source of food energy for many | Las patatas son una fuente importante de energía para muchos |
| energ.ind. | primary energy source | fuente de energía primaria |
| commun., transp. | radio reserve source of energy | fuente de energía de reserva para instalación radioeléctrica |
| 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 | fuente energética renovable |
| nat.sc. | renewable energy source contribution | contribución de las fuentes de energía renovables |
| stat., el. | source energy | energía fuente |
| energ.ind. | source of energy | fuentes de energía |
| energ.ind. | source of energy | fuente energética |
| energ.ind. | source of energy | fuente de energía |
| environ. | use of waste as energy source | uso a efectos energéticos |