So I've been working on a sci-fi book that involves interplanetary governance, and one of the things I've realized is that if one wanted to have a civilization

So I've been working on a sci-fi book that involves interplanetary governance, and one of the things I've realized is that if one wanted to have a civilization that worked on an interplanetary scale nuclear is probably the only way to go for meaningful power production. Chemical means, based on carbon products that we've used up till now, would be very rare on remote planets, solar wouldn't work because planets could be various distances from a star they orbit, or could have different atmospheric, or magnetospheric conditions that would make that impractical, wind suffers a similar issue. The only power source that could be guaranteed to work at the large scale, both in terms of space and time, reliably, and is likely to be available is nuclear power. With your other options being the quantum vacuum energy or anti-matter, but both fall more into the fiction part of sci-fi right now than the science part. it was just a fun interesting little thought exercise. I'd love to hear if anyone has a criticism of the reading though.