Reply #21: if we survive that long, we can switch from solar to "stellar" energy, right? ;)

[NuttyFluffers]

in 5 billion years we'd likely be interstellar civilization (but more likely pulverized dust and at best remote memories), so by then we can substitute 'solar' energy (for our star Sol) and replace it with any other ol' star's energy. the only point this technology wouldn't be 'eternally renewable' would be when all the stars of the universe are snuffed out. true, you could be a few light years away from the nearest "light station," and thus probably doomed to die in a cold uncaring universe, but the point still stands. the basic technological premise of this energy generation method is about as eternal as eternal can be in this temporal plane. well, as long as we aren't all replaced by a singularity...
;)