(n) natural energy (usu. renewable energy)
(n) rest energy
(n) solar energy
solar power
(n) alternative (substitute) energy
(n) geothermal energy
geothermal power
(n) internal energy (physics)
(n) wind power energy
(n) radiant energy
(n) (obsc) radiant energy
(n) arc energy
(n) (comp) Energy Star
(n) relative metabolic rate
(n) dark energy
(n) activation energy
(n) mechanical energy
(n) Agency of Natural Resources and Energy
(P)
(n) mechanical energy
(n) energy of ionization
energy of ionisation
(n) clean energy
(n) renewable energy
(n) law of conservation of energy
(n) soft energy path
(n) potential energy
(n) life-cycle energy
(n) total energy system