Energy from tidal heating is a thing for Jovian/Saturnian moons (see Io for a particularly extreme example), so there is a possibility of a 'steady input of ene

Energy from tidal heating is a thing for Jovian/Saturnian moons (see Io for a particularly extreme example), so there is a possibility of a 'steady input of energy' that's neither solar nor dependent on residual core heat. I mean, something is keeping that water liquid. I fully confess to not knowing how significant for life that is on Titan (and I guess noone else is sure, either).