Size is less of a factor there, too.

Depending on where you live, size could be a huge factor. Real estate in urban and suburban areas can be extremely valuable.

If I can use a small corner of my garage for batteries rather than half of it, that's an advantage. We can always use more power, especially when the sun provides it for free.

Might I point you to this extremely short story: The Last Question, by Isaac Asimov [1]

The reason I bring this up is because of the "always"

Link(s): [1] http://multivax.com/last_question.html