Before the recs I just want to shout out libro.FM - they sell audiobooks and donate half of the profits to independent book stores.
Classic sci fi:
- The dispossessed - also the left hand of darkness (which is meant to be good buy Inhavent read)
- Foundation series
- permutation city
I think the more modern sci fi is good too so I will give you some recommendations anyway:
- Project Hail Mary - mentioned by other commenters, really good
- Children of time - first and best of a series, really good
- Expanse - series of books set in the near future, hard sci fi and a bit of space opera
- Red rising - a space opera a bit like a fantasy book in a sci fi setting
- Murderbot - series with a bit more more comed, very entertaining and easy to get into
Another reason no one else has mentioned yet is that countries want to have control over their own power generation. If you’re power is all generated in another country then it can potentially be turned off by another country.