The residence is entirely fueled by internal energy sources (wood combustion, solar and geothermal energies). (freshome.com)
Glicksman and Ankit have found a subtle internal energy source - the bias field - occurs that actually modulates the speed of the solid / liquid interface on small scales and ends up creating remarkably complex structures. (sciencedaily.com)
@Kenneth: These planets obviously have internal energy sources if they are warmer than expected from the greenhouse effect than the composition of their (detectable) atmospheres. (notrickszone.com)